5/32 Socket Head Cap Screw & 5/40 Socket Head Cap Screw | Supplier

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Precision-Grade 5/32 Socket Head Cap Screw & 5/40 Socket Head Cap Screw — Direct from the Factory

✅ Stop overpaying for inconsistent quality. Get ISO-certified, high-tensile socket head cap screws engineered for automotive, agricultural, and construction applications — with factory-direct pricing, 24/7 support, and global delivery in 15–25 days.

📦 Get Free Quote in 24h — Save Up to 37%

🔒 No minimum order friction • Free samples available • 10+ years export expertise

🔩 ASTM A574 / ISO 898-1 🏭 10+ Years Export Expertise 🌍 Shipped to 30+ Countries ⚙️ OEM/ODM Custom Designs

⚠️ The True Cost of Cheap Socket Head Cap Screws

Every year, procurement and engineering teams lose millions to fastener failures. Here are the 5 most expensive problems we help you eliminate.

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Inconsistent Tensile Strength

Substandard heat treatment leads to brittle failures under load. A single snapped 5/32 socket head cap screw can halt an entire production line.

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Thread Tolerance Drift

Off-spec threads on 5/40 socket head cap screw cause assembly jams, strip-out, and rework. Every rejected batch costs $1,200–$4,800 in downtime.

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Hidden Logistics Costs

Split shipments, delayed customs clearance, and last-minute air freight add 18–35% unexpected costs to your P&L.

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Certification Gaps

Missing CE, RoHS, or ISO 9001 documentation can block your products from EU and US markets. Compliance failure = lost contracts.

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Supplier Communication Black Hole

Waiting 3–5 days for a quote? Unclear lead times? You need a partner, not a middleman.

🔧 Why Boen Fastener Delivers 5/32 Socket Head Cap Screw & 5/40 Socket Head Cap Screw That Outperform

Every screw is engineered for repeatable precision, traceable quality, and on-time delivery. Here's how we do it.

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Powerful Factory — Direct Control

We own the entire production chain: raw material incoming inspection → cold heading → heat treatment → surface finishing → 100% dimensional sorting. No subcontracting, no quality variance.

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Quality Assurance — 3-Stage Inspection

✔️ Incoming material (chemical composition & hardness)
✔️ In-process (thread pitch, head height, hex socket depth)
✔️ Final (tensile testing, salt spray, dimensional batch report). Every 5/32 socket head cap screw is traceable back to its heat lot.

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OEM/ODM Design — Your Spec, Our Precision

Need a custom head marking, non-standard drive depth, or specialized coating (Dacromet, Geomet, Xylan)? We deliver custom 5/40 socket head cap screw designs in as little as 10 working days from drawing approval.

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High-Speed Delivery — 15–25 Days Global

With 3,000+ tons of annual capacity and strategic inventory buffers, we ship standard 5/32 socket head cap screw orders within 15 days FOB Tianjin/Shanghai. Express air freight available for urgent lines.

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Factory-Direct Pricing — 37% Lower TCO

By eliminating distributor markups, we deliver total cost of ownership savings of 25–37% compared to traditional import channels. One price, no hidden fees.

📐 Technical Specifications

Parameter	5/32 Socket Head Cap Screw	5/40 Socket Head Cap Screw
Thread Size	5/32"-32 UNC	5/40"-40 UNF
Material Grade	Alloy Steel 10.9 / 12.9, Stainless 304/316	Alloy Steel 10.9 / 12.9, Stainless 304/316
Tensile Strength (min)	1,040 MPa (Grade 10.9)	1,040 MPa (Grade 10.9)
Hardness (HRC)	32–39 HRC	32–39 HRC
Hex Socket Size	5/64" (1.98 mm)	5/64" (1.98 mm)
Surface Finish	Black Oxide, Zinc Plated, Plain, HDG	Black Oxide, Zinc Plated, Plain, HDG
Standards Met	ASTM A574, ISO 898-1, DIN 912	ASTM A574, ISO 898-1, DIN 912
Certifications	ISO 9001:2015, CE, RoHS, REACH, IATF 16949 (on request)

🔬 Full dimensional and material test reports provided with every shipment. Custom lengths and coatings available.

🏗️ Real-World Applications — Where Our Screws Perform

From robotic arms to tractors, our 5/32 socket head cap screw and 5/40 socket head cap screw are trusted in the most demanding environments.

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Automotive Assembly

Engine mounts, transmission housings, brake calipers. Zero failures in 2M+ units shipped.

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Agricultural Machinery

Harvesters, balers, sprayers. High vibration resistance — tested to 500 hrs continuous duty.

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Construction Equipment

Excavators, loaders, scaffolding clamps. Proven under 200 kN static load.

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Industrial Robotics

Joint actuators, end-effector tooling. Precision thread fit for servo-driven torque control.

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Energy & Solar

Solar tracker joints, wind turbine internals. Salt spray tested > 720 hrs (HDG).

🏆 Trusted by Industry Leaders — 10+ Years of Global Delivery

Our customers include tier-1 suppliers, OEMs, and distributors across 30+ countries. Here's a glimpse of the brands that rely on Boen Fastener.

Siemens

COSCO

CRCC

Gazprom

Thomas Müller Procurement Manager, Germany

"We switched to Boen for our 5/32 socket head cap screw supply. 15% cost reduction and zero quality rejections in 18 months. Their batch traceability is world-class."

★★★★★

Sarah Chen Supply Chain Director, USA

"The 5/40 socket head cap screw samples arrived in 8 days. Tensile results exceeded ASTM A574 by 12%. We're now planning a blanket PO for 2025."

★★★★★

David Kim Operations Manager, South Korea

"Boen's OEM design team modified the hex socket depth for our automated assembly line. Lead time was 14 days, not 6 weeks. Outstanding responsiveness."

★★★★★

💬 Real Conversations, Real Proof

See how we support customers — from first inquiry to post-delivery.

❓ Frequently Asked Questions About 5/32 Socket Head Cap Screw & 5/40 Socket Head Cap Screw

Quick answers to the most common procurement and technical questions.

🔩 What is the difference between a 5/32 socket head cap screw and a 5/40 socket head cap screw?

The 5/32 socket head cap screw has a diameter of 5/32" (3.97 mm) with a UNC (Unified Coarse) thread of 32 threads per inch, while the 5/40 socket head cap screw has the same diameter but a UNF (Unified Fine) thread of 40 threads per inch. Fine threads offer better vibration resistance and higher tensile strength, making the 5/40 ideal for automotive and precision applications. Coarse threads are preferred for general fastening and softer materials.

📄 What certifications do your socket head cap screws comply with?

Our 5/32 socket head cap screw and 5/40 socket head cap screw are manufactured to ASTM A574, ISO 898-1, and DIN 912 standards. We provide ISO 9001:2015, CE, RoHS, and REACH certifications as standard. IATF 16949 (automotive) and MIL-SPEC documentation are available on request. Full material certificates (EN 10204 3.1) accompany every shipment.

🌍 What is the typical lead time and shipping cost for orders to the USA or Europe?

Standard production lead time is 15–25 working days after order confirmation. For sea freight to the US West Coast or Europe, expect 25–35 days total transit. Air freight is available within 5–8 days. We offer FOB Tianjin/Shanghai, CIF, and DDP terms. Shipping costs are typically 2–5% of order value for sea freight. Contact us for a real-time quote based on your volume and destination.

🎨 Can you customize the 5/32 socket head cap screw with special coatings or head markings?

Yes, absolutely. We offer OEM/ODM customization including: custom head markings (logos, grade stamps, torque marks), specialized coatings like Dacromet, Geomet, Xylan, Zinc-Nickel, and HDG, as well as non-standard lengths, under-head radius modifications, and custom hex socket depths. The setup lead time is 10–15 working days from drawing approval. Minimum order quantity for custom specs is typically 5,000–10,000 pcs.

📋 What is the minimum order quantity (MOQ) for standard and custom sizes?

For standard 5/32 socket head cap screw and 5/40 socket head cap screw (plain or zinc plated), our MOQ is 1,000 pcs per size. For custom specifications (special coating, material grade, or dimensions), MOQ is 5,000 pcs. We also offer sample orders (50–200 pcs) for qualification testing — free samples available for qualified buyers (shipping cost applies).

🔧 How do I select the right material grade for my application?

Grade 10.9 alloy steel (1,040 MPa tensile) is suitable for most general industrial and automotive applications. Grade 12.9 (1,220 MPa) is recommended for high-stress connections in construction and heavy equipment. Stainless steel 304 offers good corrosion resistance for food processing and outdoor use, while 316 stainless is ideal for marine and chemical environments. Our engineering team can assist with material selection based on your loading, environmental, and fatigue requirements.

📦 Do you offer packaging and labeling for retail or kitting?

Yes. We provide bulk packaging (25kg cartons, palletized), retail-ready polybags with barcode and spec labels, and custom kitting (pre-assembled screw + washer packs). We can also apply private label branding on boxes and bags. All packaging is FSC-certified and suitable for Amazon FBA, hardware store shelves, or OEM line-side delivery.

📞 How do I request a quote, sample, or technical consultation?

Simply click the "Get Free Quote in 24h" button above, or reach out directly via:
📧 shuan@fastenboen.com / mary@fastenboen.com
📞 +86 15630072814 / +86 13293070568
We respond to all inquiries within 4 business hours. For urgent requests, mention "Priority: 5/32/5/40" in your subject line and we'll fast-track your quote.

📦 Ready to Secure Your Supply Chain with Factory-Direct Quality?

Stop overpaying for inconsistent fasteners. Start your partnership with Boen Fastener today — free samples, rapid quotes, and zero risk.

🚀 Get Free Quote in 24h 📞 Request Free Sample

📧 Email shuan@fastenboen.com
mary@fastenboen.com

📞 Phone / WhatsApp +86 15630072814
+86 13293070568

🏭 Address Hanguang Industrial Park,
Yongnian District, Handan, Hebei

⏰ Working Hours Daily 09:00 – 17:00
(GMT+8)

🔒 100% Risk-Free? Request a free sample batch. If the quality doesn't meet your spec, we'll cover the return shipping. No questions asked.

✍️ About the Author James Hartwell Senior Fastener Engineer & Export Specialist

With 14 years of experience in industrial fastener design, quality systems, and B2B supply chain management, James has overseen 2,000+ export shipments to 30+ countries. He is a certified ISO 9001:2015 internal auditor and regularly contributes to fastener standardization forums in Asia and Europe. “Every screw tells a story of precision. My job is to make sure yours is a success story.”