Turned Product and Screw, Nut, and Bolt Manufacturing (U.S.) — An Investor's Primer

NAICS 2022 code 33272. NAICS = North American Industry Classification System, the U.S. government's standard for grouping businesses. This is a five-digit NAICS industry with two child industries: 332721 (Precision Turned Product Manufacturing) and 332722 (Bolt, Nut, Screw, Rivet, and Washer Manufacturing).

1. Overview

This industry makes the small metal parts that hold and connect nearly everything mechanical — the screws, bolts, nuts, washers, rivets, pins, shafts, bushings, valve bodies, and fittings inside your car, a jet engine, a hydraulic system, a piece of factory equipment, or a medical device. A modern vehicle contains thousands of these components; a passenger jet contains millions. Individually they cost cents to dollars; collectively they are foundational, quietly essential domestic manufacturing.

The code combines two different ways of making those parts. One child, precision turning, cuts custom round parts from metal bar stock on lathes and screw machines, usually to a customer's drawing — a job-shop business. The other, fastener manufacturing, forges standardized catalog fasteners by hammering heads onto steel wire and rolling threads — a product business. Same shelf in the hardware sense, very different economics underneath.

Why an investor should care: this is real, reshoring-relevant, defense- and aerospace-linked domestic manufacturing — and one of the most fragmented corners of the U.S. economy. Across ~4,600 mostly small, family-owned companies, the four largest hold only about 6.5% of revenue.[1][2] That fragmentation, plus a wave of owner retirements, is the whole investment story: it is primarily a private-markets, small-business-ownership, and private-equity roll-up theme, with a scattering of public proxies attached. There is no public pure-play of any scale for either child — the only U.S.-listed manufacturer whose core business sits inside this code is a micro-cap, Chicago Rivet & Machine, which happens to straddle both children by making cold-formed fasteners and screw-machine products. Public-market investors otherwise reach the theme indirectly (Sections 4 and 10).

2. What's inside — the two child industries and how they differ

NAICS 33272 has exactly two members, and the real analytical value is the contrast between them. Precision turning is roughly twice the size of fastener manufacturing by revenue and dominates the establishment and employment counts; fastener making is smaller but noticeably more concentrated at the top, and it is far more exposed to imports. They differ in process, product, ownership, measurement, and how you invest.

CNC = computer numerical control, a computer directing the machine's motions. HHI = Herfindahl-Hirschman Index, a market-concentration score running to 10,000; the top-4 share is the "CR4" concentration ratio. SBA = U.S. Small Business Administration. PE = private equity.

What both share. Both are derived-demand, cyclical businesses — they rise and fall with their customers' output in autos, aerospace, machinery, and construction. Both split sharply into a commodity end (thin-margin, price-competitive, import-exposed) and a specialty end (aerospace, medical, exotic alloys) where hard-won qualifications create durable pricing power. Both face the same aging-owner succession squeeze and the same private-equity consolidation. Both children also warn that commercial "market size" reports mix manufacturing, distribution, imports, and adjacent processes into figures Census would never recognize. The differences are in how they make parts, what the official statistics miss, and how public capital reaches them.

What 33272 leaves out. This code does not include general machine shops that mill, drill, and grind rather than turn — those sit in the large sibling industry 332710 (Machine Shops), one level over in industry group 33271. Nor does it include plastic fasteners (326199), wire forms and springs (332618/332613), wholesale fastener distribution (Fastenal, Grainger, and thousands of distributors sit in wholesale-trade codes), the machines that build the lathes and headers (333517), or the heat-treating, plating, and coating steps applied afterward (3328xx).[5]

3. How big it is

Our ground-truth federal statistics for the whole of NAICS 33272:

From these figures the shape is clear: the average company runs roughly $7.9 million in annual revenue, the average establishment employs about 30 people, and pay averages about $65,000 per worker.[1][2] These are small, capital-intensive, blue-collar businesses.

The children reconcile cleanly to these totals on establishments, employment, payroll, and receipts. The one line that does not add is firms: 3,951 turning companies and 669 fastener companies against 4,607 at the level, because Census counts a company in each industry where it operates.[1][2][3] Treat firm counts as per-industry, not additive.

Concentration — extraordinarily fragmented, but unevenly. The largest four companies account for just 6.5% of revenue, the top 8 for 11.1%, the top 20 for 19.1%, and the top 50 for only 29.7%.[2] The HHI is 25.4 — near the floor of what the Census reports, confirming no dominant player.[2] The blended figure hides a real split: precision turning is even more fragmented (HHI 13.4, top 50 = 23% of revenue), while fastener manufacturing is meaningfully tighter (HHI 160.2, top 50 = 67.4%), because the aerospace/specialty-fastener niche is dominated by a handful of qualified players.[3] Read the level as "atomized job-shop base, with one concentrated specialty spine running through the fastener side."

The undercount caveat (two overlapping gaps). These federal figures count merchant establishments — independent businesses that sell parts on contract — and they materially understate true activity for two different reasons:

• Captive in-house work (turning side). Enormous volumes of turning are done captively inside automakers, aerospace primes, medical-device firms, and appliance makers; that work is classified under the parent's own industry, not 332721, so the code undercounts precision turning actually happening in the U.S.
• Imports and distribution (fastener side). Most fasteners consumed in the U.S. are made abroad and never touch a domestic 332722 plant. Independent research puts the total U.S. fastener market — including imports and the distribution markup — at roughly $23.6 billion in 2024, rising above $29 billion by 2030, far above the ~$12.9 billion of domestic fastener manufacturing.[6] Taiwan supplies about a third of U.S. fastener imports (~$2.3 billion) and China nearly a fifth (~$1.3 billion), with Japan next;[7] Fastenal, the largest fastener distributor, states that most of its suppliers are outside North America.[8] Domestic making is a minority of what Americans actually use.

Because the industry is also overwhelmingly small and private, the merchant-establishment counts understate the number of very small and individual operators. Read the $36.4 billion as domestic merchant manufacturing revenue, not as the size of the U.S. market for these parts. (Private market-research "global precision machining/fastener" figures run into the hundreds of billions but use far broader definitions and geographies and are not comparable to the federal numbers above.[9])

4. The investable universe — where value concentrates across the children

There is no U.S.-listed company of scale whose primary business is precision turning or fastener manufacturing under this code. Value for public investors concentrates in three places, and it differs by child.

On the turning side (332721) — asset-light platforms, component makers, and aerospace consolidators. The cleanest public exposure is to businesses that route or supply turning demand, or that acquire turning capacity, rather than run job shops:

On the fastener side (332722) — fastener units inside big industrials, one micro-cap maker, plus distributors. Public exposure is diluted inside diversified parents or comes through distribution — with the notable exception that Howmet now reports a fastener segment large and profitable enough to analyze on its own:

Two divestitures reshaped this table. Stanley Black & Decker sold its STANLEY Engineered Fastening aerospace business (Consolidated Aerospace Manufacturing) to Howmet in April 2026 for ~$1.8 billion,[17] and TriMas sold its aerospace-fastener segment (Monogram, Allfast, Mac Fasteners, TFI Aerospace) to PennAero — backed by Tinicum and Blackstone — for about $1.45 billion at roughly 18x EBITDA, closing March 16, 2026.[22] Neither retains direct aerospace-fastener exposure; the aerospace end of this level is now more concentrated in Howmet, Berkshire's SPS, LISI Aerospace, and PennAero than it was a year ago.

Foreign-listed fastener pure-plays exist for investors who want direct exposure: LISI S.A. (Paris), Bossard and SFS Group (Zurich), Bufab AB and Bulten (Stockholm).

The real operators are private on both sides. Thousands of family-owned job shops and fastener plants form the backbone. The most active buyers are private-equity roll-ups: on the turning side, CORE Industrial Partners' PrecisionX Group, White Wolf Capital, D.E. Shaw-backed Threadlock Precision, and Madison Dearborn's ALIGN Precision;[24] on the fastener side, MW Components (owned by American Securities, which bought Elgin Fastener Group in 2023), Optimas, and independents such as MacLean-Fogg.[25] The scale these platforms reach is real but is not market share — Precinmac reports eight North American facilities and 525+ precision machines,[26] Cadrex 21 facilities and 600+ machines,[27] both spanning fabrication and stamping as well as machining. Barnes Group (aerospace/industrial precision components) was taken private by Apollo Global Management for ~$3.6 billion and delisted in January 2025.[23]

5. How the money works

Neither child is a high-margin technology business; both are capital- and labor-intensive operations that make money by keeping expensive machines running near capacity and by climbing from commodity work toward specialized, qualified work. The levers differ slightly:

• Turning (332721): spindle utilization is the master metric. A CNC lathe or Swiss-type screw machine can cost from ~$100,000 to over $1 million; those fixed costs are only absorbed when the spindle is turning and making good parts. Shops track machine uptime and overall equipment effectiveness (OEE — a combined measure of availability, speed, and quality), plus scrap, tool life, unattended hours, and changeover discipline. Material (steel, stainless, brass, aluminum, titanium) is often a pass-through, but price swings squeeze the gap between quote and delivery. Revenue ≈ billed machine hours + material passed through.
• Fasteners (332722): the steel-to-selling-price spread is the swing. Cold-heading-quality (CHQ) steel wire rod is the dominant input — for wire-based metal producers, raw material can run 80–90% of operating cost.[28] Makers pass steel moves through via surcharges, but margins pinch when metal spikes faster than they can reprice. Capacity utilization, material yield, tooling life, and heat-treat/plating reject rates are the operating levers; a line running two shifts flat-out prints money, a half-idle one bleeds.
• Mix determines margin — the shared rule, now with numbers. The children give three segment-level read-outs along the commodity-to-specialty ladder. At the specialty extreme, Howmet's Fastening Systems earned a 30.4% adjusted EBITDA margin in 2025, up from 25.8% in 2024.[16] In the middle, NN's Mobile Solutions segment — automotive-heavy precision machining — ran about 11.5% gross margin before segment depreciation, amortization, and selling costs on $244 million of 2025 sales, with $9 million of capital expenditure against $21 million of D&A.[29] At the commodity end, Chicago Rivet booked $24.1 million of 2025 fastener-segment revenue while the consolidated company recorded a $1.1 million net loss.[21] These are different companies with different scopes and are not like-for-like margins — but the ordering is the point, and it holds across both children.
• Qualification is the moat. On the high end the durable advantage is not a patent — it's approvals. Getting qualified on a customer's part number or an aircraft program can take years; switching suppliers means requalifying. That lock-in makes revenue sticky and is why the specialty end trades at premium valuations. Quality aerospace/defense turning shops with $2M+ of EBITDA (earnings before interest, taxes, depreciation, and amortization) have traded around 7x–11x EBITDA in recent private M&A,[30][31] and elite aerospace-fastener assets at ~18x[22] — rich multiples for small manufacturers.
• Bottom line. Net margins are thin at the commodity end, healthier for specialists. Cash flow is consumed by capital spending on new machines and by working capital (metal inventory and receivables). Fixed overhead makes volume declines painful and recoveries lucrative: the turning trade association's sales index ran 133 in 2019, fell to 119 in 2020, recovered to 141 in 2021, and averaged 164 through September 2022 — the operating swing of one cycle in four numbers.[32]

6. What drives demand

Both children are derived-demand, cyclical businesses that move with their customers' production. The end markets overlap heavily:

• Automotive and light/heavy truck — historically the single largest buyer of both turned parts and fasteners (powertrain, chassis, fuel, brake, steering); roughly ~30% of fastener demand.[33] Tied to vehicle build rates (SAAR — seasonally adjusted annualized rate of vehicle sales).
• Construction — a big fastener market (~27%): structural bolts, anchors, framing fasteners tied to building activity.[33]
• Aerospace and defense — small by tonnage, large by value and margin; the key growth driver as Boeing 737 MAX, Airbus A320neo, and 777X build rates ramp and defense budgets rise. High-value titanium and superalloy parts.[9]
• Medical devices, industrial machinery, robotics, fluid power, electronics, energy, and firearms round out the mix; industrial machinery and robotics (~10–12% of fastener demand) are the fastest-growing.[33]

The two ends are currently moving in opposite directions, which is the most useful thing this level tells you right now. Howmet's Fastening Systems sales rose 11% in 2025, which management attributed principally to commercial-aerospace growth.[16] Meanwhile Chicago Rivet drew $15.1 million of its 2025 fastener revenue from automotive customers against $8.9 million non-automotive, and attributed weaker underlying automotive sales to lower North American vehicle production and customer inventory caution.[34] Aerospace is tight; auto is soft. A rollup average would hide that.

Because so much demand is automotive and industrial, the level tracks the broad manufacturing cycle — the ISM Purchasing Managers' Index (PMI, a monthly survey of factory activity), industrial production, and durable-goods orders are useful real-time gauges. Distributor destocking amplifies the cycle for makers, who feel both final-demand changes and their customers' inventory swings. Two structural forces cut across it: reshoring/onshoring of supply chains (a tailwind for domestic capacity) and the electric-vehicle (EV) transition — a mix shift more than a volume thesis, deleting machined engine and transmission parts and internal-combustion fasteners while adding battery busbars, thermal-management components, connectors, and engineered joining systems for mixed-material lightweight structures.

Substitution differs by child. For turning, the threat is additive manufacturing, which NIST characterizes as advantaged in complex, customized, low-volume work but limited on material availability, repeatability, dimensional accuracy, surface finish, and qualification — and which frequently requires post-process drilling, tapping, or finish machining, shifting turning toward finishing rather than eliminating it.[35] For fasteners, the threat is design-out: welding, adhesives, clinching, and molded-in features can replace mechanical hardware, though removable joints and safety-critical assemblies generally still require it.

7. Regulation

The businesses are lightly regulated as businesses, but operate inside a dense web of customer-mandated certifications and cross-cutting government rules:

• Quality certifications (customer-driven): ISO 9001 (baseline quality management), AS9100 (aerospace/defense), ISO 13485 (medical devices), IATF 16949 (automotive), and NADCAP (accreditation for special processes like heat treating and plating). These are effectively the price of admission to high-value work and a durable moat, and they are the same gate on both sides of the level.[36]
• Fastener-specific law (332722): the Fastener Quality Act of 1990 requires that certain threaded metallic fasteners (nominal diameter ≥1/4 inch) referencing a consensus standard actually conform to it, with accredited testing and grade-marking — passed after 1980s counterfeit-certification failures. Its practical reach is narrower than commonly assumed: numerous categories, including many proprietary, aerospace-approved, and quality-system-produced fasteners, are exempt.[37]
• Defense and export controls: ITAR (International Traffic in Arms Regulations) and the EAR (Export Administration Regulations) govern defense-related parts and technical data; CMMC (Cybersecurity Maturity Model Certification) is required to handle Department of Defense controlled information. ITAR registration restricts who may even see a print.[36]
• Environmental and worker safety — different rulebooks per child. Turning shops fall under EPA's Metal Products and Machinery effluent guidelines (40 CFR Part 438), which apply to roughly 2,400 direct-discharging facilities across metal-product sectors,[38] plus coolant and metalworking-fluid handling. Fastener plating and coating fall under EPA's electroplating effluent guidelines — limiting cyanide and metals including lead, cadmium, copper, nickel, chromium, zinc, and silver, with PFAS discharges now under examination[39] — and chromium-electroplating tanks are separately subject to hazardous-air-pollutant standards (40 CFR Part 63, Subpart N).[40] OSHA covers machine guarding, fluid mist, hexavalent chromium, and noise across both; hazardous waste falls under RCRA (Resource Conservation and Recovery Act).
• Trade policy is a first-order regulatory force — and the children cite different rates. The turning primer's source describes Section 232 tariffs on steel and aluminum raised to 50% on most imports in 2025, an input-cost headwind for shops buying metal.[41] The fastener primer's source describes a 25% Section 232 derivative tariff reaching many imported fasteners, which protects domestic makers against finished imports.[42] Both are in play, they attach to different goods, and their effects run in opposite directions for the same company. Section 301 tariffs on China, antidumping/countervailing duties repeatedly targeting Chinese and Taiwanese fasteners, and "Buy American" content rules sit on top.

8. Consolidation

With the top four firms at just 6.5% of revenue, competition is local, relationship-driven, and price-sensitive at the commodity end.[2] The defining trend across both children is consolidation, driven by three converging forces: an aging population of owners facing succession with no family successor; premium valuations (7x–11x EBITDA for quality turning shops, ~18x for elite aerospace fasteners) that make selling attractive; and private equity with abundant unspent capital hunting platform and bolt-on deals.[22][30][31] Trade press reported private-equity buyers at almost 60% of precision-manufacturing M&A activity in 2020,[43] and deal volume rose again in 2025, led by strategic acquirers.[44]

Buyers assemble regional shops into larger, vertically integrated platforms that can offer OEMs (original equipment manufacturers) turnkey supply, shorter lead times, and consistent quality — PrecisionX/CORE, White Wolf, Threadlock, and ALIGN on the turning side;[24] MW Components (which bought Elgin Fastener Group in 2023) and Optimas on the fastener side.[25] Platform scale is now substantial in absolute terms — Precinmac at eight facilities and 525+ machines, Cadrex at 21 facilities and 600+ machines[26][27] — yet still invisible in the concentration ratios, which is exactly how fragmented this level remains.

The two children consolidate differently. Turning consolidates horizontally and privately, shop by shop. Fasteners consolidate at the top: Howmet's $1.8 billion purchase of Consolidated Aerospace Manufacturing in April 2026 further tightened an already-concentrated aerospace niche,[17] while on the commodity side distribution has consolidated faster than manufacturing — Fastenal's vending/vendor-managed-inventory model and Grainger's scale reshape how fasteners reach customers. The countervailing threats: offshore competition (China, Taiwan, India, Mexico) on price-sensitive parts, automation (lights-out, unattended machining) that lets efficient shops undercut laggards, and digital marketplaces (Xometry, Proto Labs) that commoditize quick-turn, low-volume turning by instantly routing it to a network.[10][11]

9. Risks

• Cyclicality. Revenue swings with auto, construction, industrial, and aerospace production; a downturn hits utilization and margins fast, and distributor destocking amplifies it.
• Input-cost and tariff volatility. Steel, brass, aluminum, and titanium prices — and the tariffs on them — move faster than small shops can reprice contracts. The sensitivity is not simply "metal up, margin down": purchase timing, scrap recovery, customer price-adjustment formulas, repricing lag, and alloy mix all matter.[41][42]
• Import competition and trade whiplash. Most U.S. fastener consumption is imported; tariff and antidumping regimes can swing a domestic maker's competitiveness overnight in either direction.[7]
• Customer concentration. Many shops depend on one or two OEM programs. The listed proxies show the shape: NN's ten largest customers were ~49% of 2025 sales with one Mobile Solutions customer at 11%,[29] and Chicago Rivet's largest customer was ~19% of 2025 consolidated revenue, its second ~10%.[21] Losing or cancelling a program can be existential.
• Labor shortage and succession. Machinists and cold-heading operators are aging out — roughly 70% of machinists are over 45, apprenticeships take 3–4 years, and manufacturing has hundreds of thousands of unfilled openings.[45] BLS counted 74,570 machinists in the broader machine-shop/turned-product/fastener industry group in May 2023 at $51,770 mean annual pay — a wider group than 33272, and a different base from the ~$65,000 all-employee average implied by this level's payroll.[1][46] On the fastener side the scarcity is specific: experienced header operators, tool-and-die staff, metallurgists, and quality engineers. Finding a buyer or successor for an owner-run shop is itself a risk.
• Thin, fragile qualified capacity. The February 2025 fire at SPS Technologies reportedly knocked out ~15% of U.S. aerospace-fastener supply, and post-pandemic aerospace-fastener lead times ran 2–5x normal with 20–30% price inflation — a reminder that certified capacity is thin and hard to replace.[47]
• Quality and liability asymmetry. These parts cost cents but sit inside safety-critical systems. A defect, false certification, or bad heat treat can trigger sorting, line shutdowns, recall participation, loss of approved-supplier status, and liabilities vastly exceeding the affected revenue.
• Capital intensity and interest rates. New machines are expensive and often debt-financed; higher rates raise both equipment and roll-up acquisition costs.
• Technology and substitution. The EV transition removes many traditional machined engine parts and fasteners; additive manufacturing can displace some turned components (though high-volume turning is largely insulated),[35] and adhesives, welding, and design-out pressure commodity fasteners.
• Environmental legacy. Older plating, heat-treatment, and cleaning operations can carry site liabilities that outlive the equipment.

10. How to invest and the outlook

Public-market routes (all indirect at any scale):

• Turning theme: asset-light marketplaces Xometry (XMTR) and Proto Labs (PRLB); precision-component makers Helios (HLIO), NN, Inc. (NNBR), and small-cap Pro-Dex (PDEX); "pick-and-shovel" tooling via Kennametal (KMT); and the aerospace consolidators — HEICO (HEI), TransDigm (TDG), Curtiss-Wright (CW), Howmet (HWM) — through which public capital actually rolls up machining capacity.[10][11][12][13][14][15]
• Fastener theme: the most direct large-cap leverage is Howmet (HWM), whose Fastening Systems segment is separately reported and was enlarged by the 2026 CAM acquisition;[16][17] then diversified industrials ITW and Nucor (NUE);[18][19] Berkshire Hathaway (BRK.A/B) via Precision Castparts/SPS, with no separate fastener disclosure;[20] micro-cap Chicago Rivet (CVR) for direct but small, automotive-sensitive exposure;[21] and foreign pure-plays LISI (Paris), Bossard and SFS (Zurich), Bufab and Bulten (Stockholm).
• Volume proxy: fastener distributors Fastenal (FAST) and W.W. Grainger (GWW), plus Distribution Solutions Group (DSGR) — not makers, but clean, liquid bets on fastener throughput.[8]

Private-market routes (the direct exposure — and the bigger opportunity):

• Buy or own a shop. With a wave of owner retirements, acquiring an established, cash-flowing turning or fastener business — often with SBA-backed financing or through a search fund — is the most direct way to own this industry. Certified aerospace/medical operations carry the highest multiples and best moats.[30][31]
• Back a roll-up. Invest (as a limited partner) in aerospace/industrial private-equity funds executing precision-machining or fastener consolidation.[24][25]
• Supply the industry. Machine tools, tooling, automation, and shop-floor software vendors capture the capital-spending side of the theme.

Diligence at this level has one shared trap: the code on the tin. Many businesses marketed as "precision machining" companies actually derive most revenue from 332710 machine-shop work, stamping, or proprietary products rather than 332721; many "fastener" companies are distributors in wholesale codes, not manufacturers. Establishment counts measure operating locations, not corporate owners. On both sides, reconcile sales by customer, program, part number, material, and machine; separate recurring production from tooling and pass-through revenue; normalize maintenance capital expenditure; and test utilization, scrap, rework, and on-time delivery rather than headline growth.

Near-term drivers and outlook (forward-looking judgment). The demand backdrop is favorable but uneven: a multi-year aerospace production ramp, elevated defense spending, secular medical-device growth, and reshoring all support domestic turning and fastener capacity — Howmet's 11% 2025 fastening growth shows what that looks like in a P&L,[16] while the SPS fire underlined how thin qualified capacity is[47] and Chicago Rivet shows the automotive commodity end still soft.[34] Consolidation should continue as owner succession meets abundant private capital. The two live swing factors are tariffs (protective for domestic makers on finished parts, a cost headwind on imported metal — and the children cite different rates for each side of that trade) and labor (the binding constraint that automation is racing to relieve). Auto and general-industrial exposure keep the level cyclical, so timing matters. On balance, the durable thesis is not "buy turned parts and fasteners" broadly — it is to favor the qualification-protected, specialty, and aerospace niches where pricing power lives, and treat the commodity base as a cyclical, trade-policy-driven trade.

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Sources

1. U.S. Census Bureau. County Business Patterns 2023, NAICS 33272 and children 332721/332722 (establishments, employment, annual payroll). 2023. https://www.census.gov/programs-surveys/cbp.html
2. U.S. Census Bureau. 2022 Economic Census — Comparative Statistics and Concentration Ratios, NAICS 33272 (receipts, firms, CR4/CR8/CR20/CR50, HHI). 2022. https://www.census.gov/programs-surveys/economic-census.html
3. U.S. Census Bureau. 2022 Economic Census / County Business Patterns — child-industry detail, NAICS 332721 and 332722 (receipts, firms, establishments, employment, CR4/CR50, HHI). 2022–2023. https://www.census.gov/programs-surveys/economic-census.html
4. U.S. Small Business Administration. Table of Small Business Size Standards (NAICS 332721 = 500 employees; NAICS 332722 = 600 employees). 2023. https://www.sba.gov/document/support-table-size-standards
5. U.S. Census Bureau. 2022 NAICS Definitions — 33272, 332721, 332722 (and adjacent codes 332710, 326199, 332613, 332618, 333517). 2022. https://www.census.gov/naics/
6. Roche Industry. "The 10 Best Fastener Manufacturers in the USA" (U.S. fastener market ~$23.6B in 2024, >$29B by 2030). 2026. https://www.rocheindustry.com/fastener-manufacturers-in-the-usa/
7. Fastener World. "Facing U.S. 25% Tariff, Taiwanese Suppliers…" (U.S. fastener import shares: Taiwan ~1/3 / ~$2.3B, China ~1/5 / ~$1.3B, Japan next). 2025. https://www.fastener-world.com/en/article/9104.html
8. Fastenal Co. Form 10-K, FY2025 (supplier geography, supply-chain economics, customer mix). 2026. https://www.sec.gov/Archives/edgar/data/815556/000081555626000009/fast-20251231.htm
9. Fortune Business Insights / Grand View Research. Precision Machining Market Size & Share Reports (global scope; end-market drivers). 2025. https://www.fortunebusinessinsights.com/precision-machining-market-115757
10. Xometry, Inc. Fourth Quarter and Full Year 2025 Results (revenue $686.6M). 2026. https://investors.xometry.com/news-releases/news-release-details/xometry-reports-record-fourth-quarter-and-strong-full-year-2025
11. Protolabs, Inc. Fourth Quarter and Full Year 2025 Results (revenue $533.1M; CNC machining growth). 2026. https://protolabs.gcs-web.com/news-releases/news-release-details/protolabs-reports-financial-results-fourth-quarter-and-full-6/
12. Helios Technologies, Inc. FY2025 revenue (~$839M). 2026. https://simplywall.st/stocks/us/capital-goods/nyse-hlio/helios-technologies
13. NN, Inc. Fourth Quarter and Full Year 2024 Results (net sales $464.3M). 2025. https://nninc.gcs-web.com/news-releases/news-release-details/nn-inc-reports-fourth-quarter-and-full-year-2024-results
14. Pro-Dex, Inc. SEC Filing — Advanced Precision Machining acquisition. 2026. https://www.sec.gov/Archives/edgar/data/788920/000107997326000580/pdex_10q-0033126.htm
15. Kennametal Inc. Investor Overview (fiscal 2025 revenue ~$2.0B). 2025. https://investors.kennametal.com/
16. Howmet Aerospace Inc. Form 10-K, FY2025 — Fastening Systems segment ($1.745B revenue, 30.4% adjusted EBITDA margin vs 25.8% in 2024, 11% sales growth, input costs, tariff risks). 2026. https://www.sec.gov/Archives/edgar/data/4281/000000428126000012/hwm-20251231.htm
17. Howmet Aerospace Inc. Form 8-K, April 6, 2026 (completion of Consolidated Aerospace Manufacturing acquisition from Stanley Black & Decker for ~$1.8B). 2026. https://www.sec.gov/Archives/edgar/data/4281/000110465926039791/tm2611168d1_8k.htm
18. Illinois Tool Works Inc. Form 10-K, FY2024/2025 — Construction Products segment (Paslode, Ramset, Red Head). 2025. https://s204.q4cdn.com/218186261/files/doc_financials/2025/sr/10-K.pdf
19. Nucor Corporation. "Nucor Fastener to Expand with Acquisition of Coil Processing Facility" (St. Joe, IN; ~75,000 tons/yr; ~240 employees; large-diameter capacity). 2021. https://nucor.com/news-release/nucor-fastener-to-expand-with-acquisition-of-coil-processing-facility-122560
20. Berkshire Hathaway Inc. Form 10-K, FY2025 (Precision Castparts/SPS Technologies and Marmon ownership; no separate fastener disclosure). 2026. https://www.sec.gov/Archives/edgar/data/1067983/000119312526083899/brka-20251231.htm
21. Chicago Rivet & Machine Co. Form 10-K, FY2025 (fastener segment revenue $24.1M, $1.1M consolidated net loss, customer concentration, competitive landscape). 2026. https://www.sec.gov/Archives/edgar/data/19871/000001987126000004/cvr-20251231.htm
22. TriMas Corporation. "TriMas Completes the Divestiture of TriMas Aerospace" (sale to PennAero/Tinicum, ~$1.45B, ~18x EBITDA, closed March 16, 2026). 2026. https://trimas.com/news/2026/trimas-completes-the-divestiture-of-trimas-aerospace/
23. Business Wire. "Apollo Funds Complete Acquisition of Barnes Group" (~$3.6B; delisted Jan 27, 2025). 2025. https://www.businesswire.com/news/home/20250126866838/en/Apollo-Funds-Complete-Acquisition-of-Barnes-Group
24. CT Acquisitions. 2026 Manufacturing PE Roll-Up Tracker (PrecisionX/CORE, White Wolf, Threadlock). 2026. https://ctacquisitions.com/manufacturing-pe-rollup-tracker-2026/
25. Global Fastener News / PR Newswire. "MW Components Acquires Elgin Fastener Group" (September 2023). 2023. https://www.prnewswire.com/news-releases/mw-components-expands-fastener-products-through-acquisition-of-elgin-fastener-group-301923441.html
26. Precinmac. Company Profile (8 facilities, 525+ machines). https://www.precinmac.com/about
27. Cadrex. Company Profile (21 facilities, 600+ machines). https://www.cadrex.com/about/
28. IMARC Group / SteelOnTheNet. "Steel Wire Rod / Long Steel Products" (cold-heading-quality rod as input; raw-material share of cost). 2026. https://www.steelonthenet.com/essentials/long-steel-products.html
29. NN, Inc. 2025 Form 10-K (Mobile Solutions segment sales, gross margin, capital expenditure and D&A; customer concentration; material pass-throughs; EV exposure). 2026. https://www.sec.gov/Archives/edgar/data/918541/000091854126000006/nnbr-20251231.htm
30. Focus Investment Banking. "Why precision machining shops are seeing premium valuations right now" (7x–11x EBITDA). 2025. https://focusbankers.com/why-precision-machining-shops-are-seeing-premium-valuations-right-now/
31. CT Acquisitions. Precision Machining M&A Multiples Report 2026. 2026. https://ctacquisitions.com/guides/precision-machining-ma-multiples-2026/
32. Precision Machined Products Association. Business Trends Report, September 2022 (sales index: 133 in 2019, 119 in 2020, 141 in 2021, 164 average through September 2022). 2022. https://www.pmpa.org/wp-content/uploads/2022/10/PMPA-Business-Trends-September-2022.pdf
33. GMInsights. "Industrial Fasteners Market Size, 2025–2034" (end-market shares: automotive ~30%, construction ~27%, machinery/robotics ~10–12% and fastest-growing). 2025. https://www.gminsights.com/industry-analysis/industrial-fasteners-market
34. Chicago Rivet & Machine Co. 2025 Annual Report (automotive $15.1M vs nonautomotive $8.9M fastener revenue; North American vehicle production commentary). 2026. https://www.chicagorivet.com/wp-content/uploads/AnnualReport-2025.pdf
35. National Institute of Standards and Technology. Additive Manufacturing Research Center (advantages and limitations; post-process machining of additive parts). https://www.nist.gov/laboratories/tools-instruments/additive-manufacturing-research-center-amrc
36. 3ERP. "CNC Machining Certifications and Standards" (ISO 9001, AS9100, ISO 13485, ITAR, NADCAP). 2025. https://www.3erp.com/blog/cnc-machining-certifications-and-standards/
37. NIST / U.S. Bureau of Industry and Security. Compliance FAQs: Fastener Quality Act (Public Law 101-592, 1990); scope, testing, grade-marking, and exemptions. 2022. https://www.nist.gov/standardsgov/compliance-faqs-fastener-quality-act-fqa
38. U.S. Environmental Protection Agency. Metal Products and Machinery Effluent Guidelines (40 CFR Part 438; ~2,400 direct-discharging facilities). https://www.epa.gov/eg/metal-products-and-machinery-effluent-guidelines
39. U.S. Environmental Protection Agency. Electroplating Effluent Guidelines (cyanide and metals limits; PFAS examination). https://www.epa.gov/eg/electroplating-effluent-guidelines
40. U.S. Environmental Protection Agency. Chromium Electroplating: National Emission Standards for Hazardous Air Pollutants (40 CFR Part 63, Subpart N). https://www.epa.gov/stationary-sources-air-pollution/chromium-electroplating-national-emission-standards-hazardous-air
41. Manufacturing Dive / Alliance for American Manufacturing. Section 232 steel/aluminum tariffs (50% on most imports, 2025) and small-manufacturer input-cost impact. 2025. https://www.manufacturingdive.com/news/trump-tariffs-steel-reshoring-jobs-supply-chain-china-mexico-canada/742350/
42. ArkFastech. "Recent U.S. Tariff Policies and Their Impact on Taiwanese Fastener Products" (25% Section 232 derivative tariff reaching imported fasteners). 2025. https://www.arkfastech.com/th/knowledge-detail/Carbonitriding__1/
43. SME / Capstone Partners. "Report: M&A in Precision Manufacturing Industry Remains High" (private equity ~60% of 2020 activity). 2020. https://www.sme.org/technologies/articles/2020/september/report-ma-in-precision-manufacturing-industry-remains-high/
44. Capstone Partners. Precision Manufacturing Market Update (2025 M&A volume, strategic acquirers). 2025. https://www.capstonepartners.com/insights/article-precision-manufacturing-market-update/
45. Manufacturing Dive / National Association of Manufacturers. Manufacturing workforce shortage, machinist age profile, and job-opening data. 2025. https://www.manufacturingdive.com/
46. U.S. Bureau of Labor Statistics. Occupational Employment and Wages, May 2023: Machinists (51-4041) — 74,570 employed in the machine shops/turned product/screw, nut and bolt industry group at $51,770 mean annual pay. 2023. https://www.bls.gov/oes/2023/may/oes514041.htm
47. Melfast / U.S. GAO. "How the 2025 Aerospace Fastener Shortage Affects Your Supply Chain" (SPS Technologies fire ~15% of U.S. aerospace-fastener supply; lead times 2–5x normal, 20–30% price inflation); GAO-24-106493, Commercial Aviation Manufacturing. 2024–2025. https://www.melfast.com/blog/how-the-2025-aerospace-fastener-shortage-affects-your-supply-chain