6-32 x 3/8 Socket Head Cap Screw & 6-40 Socket Head Screw | Maker
Premium 6-32 x 3/8 Socket Head Cap Screw & 6-40 Socket Head Screw โ Direct from a Trusted Global Maker
๐จ๐ณ Factory-direct pricing โข 10+ years export expertise โข 30+ countries served โข ISO 9001 certified โข OEM/ODM ready
โก Stop overpaying for inconsistent quality. Get 6-32 x 3/8 socket head cap screw and 6-40 socket head cap screw that meet ASTM, SAE, and DIN standards โ with full traceability, competitive pricing, and 15โ25 day lead times.
๐ธ Handan Boen Fastener โ dedicated production line for 6-32 x 3/8 socket head cap screw
โ๏ธ The Real Cost of Using the Wrong Socket Head Screw
Every day, procurement managers and engineers face the same six frustrations when sourcing 6-32 x 3/8 socket head cap screw and 6-40 socket head cap screw:
- ๐ด Inconsistent quality โ heads strip, threads fail, batches vary
- ๐ด Hidden costs โ high shipping, minimums, and middleman markups
- ๐ด Long lead times โ 45โ60 day delays stall your production line
- ๐ด Poor fit โ wrong thread pitch (UNF vs UNC) causes assembly rejects
- ๐ด No traceability โ cannot verify material grade or heat treatment
- ๐ด Supplier risk โ unreliable communication, no after-sales support
๐ According to a 2025 industry survey, 43% of manufacturing firms reported assembly-line downtime due to substandard fasteners โ costing an average of $12,000 per hour in lost output.
๐ฉ Precision-Engineered Socket Head Cap Screws โ Built for Reliability
Our 6-32 x 3/8 socket head cap screw and 6-40 socket head cap screw are manufactured to exacting tolerances, ensuring consistent performance in every application.
Factory-Direct Value
Eliminate 2โ3 layers of middlemen. Our factory-direct pricing on 6-32 x 3/8 socket head cap screw saves you 18โ30% versus distributor prices.
Grade & Material Options
Available in Alloy Steel (12.9), Stainless Steel (304, 316), and Carbon Steel (8.8, 10.9). All heat-treated and passivated.
Precision Threading
UNF threads on 6-40 socket head cap screw and UNC on 6-32 x 3/8 socket head cap screw โ both 3A tolerance for reliable engagement.
High-Speed Delivery
Standard lead time: 15โ25 days. Express options available. We ship to 30+ countries via air, sea, or express courier.
Full Traceability
Each batch includes material test certificates (MTC), heat number, and plating thickness report. 100% inspection available.
OEM/ODM Customization
Custom head markings, special platings (Zn, Ni, Dacromet), and non-standard lengths available. Min. order: 5,000 pcs per SKU.
๐ Technical Specifications โ 6-32 x 3/8 Socket Head Cap Screw & 6-40 Socket Head Screw
All data verified per ASME B18.3 and SAE J429 standards. Use the table below to compare and specify your exact requirements.
| Parameter | 6-32 x 3/8 Socket Head Cap Screw | 6-40 Socket Head Cap Screw |
|---|---|---|
| Thread Size | #6-32 (UNC) | #6-40 (UNF) |
| Thread Pitch | 32 threads per inch | 40 threads per inch |
| Length | 3/8 inch (9.53 mm) | 3/8 inch (9.53 mm) โ also available in 1/4, 1/2, 5/8, 3/4 |
| Head Diameter (max) | 0.226 in (5.74 mm) | 0.226 in (5.74 mm) |
| Head Height (max) | 0.138 in (3.51 mm) | 0.138 in (3.51 mm) |
| Hex Socket Size | 5/64 in (1.98 mm) | 5/64 in (1.98 mm) |
| Tensile Strength (Grade 12.9) | โฅ 1220 MPa | โฅ 1220 MPa |
| Hardness (Grade 12.9) | 39โ44 HRC | 39โ44 HRC |
| Material Grades Available | 8.8, 10.9, 12.9, 304, 316 | 8.8, 10.9, 12.9, 304, 316 |
| Plating / Coating Options | Zn, Ni, Cr, Dacromet, Black Oxide | Zn, Ni, Cr, Dacromet, Black Oxide |
| Standards Met | ASME B18.3, SAE J429, DIN 912 | ASME B18.3, SAE J429, DIN 912 |
๐ Custom lengths, platings, and head markings available upon request. Contact us for a full specification sheet.
๐๏ธ Real-World Applications
These precision fasteners are used across industries where reliability and strength are non-negotiable.
Automotive
Engine components, transmission assemblies, brake systems
Agricultural Machinery
Tractor linkages, harvester frames, irrigation equipment
Industrial Equipment
Pump housings, valve actuators, conveyor systems, robotics
Construction
Structural steel connections, scaffolding, heavy-duty fixtures
Electronics & Enclosures
Server racks, control panels, precision instrumentation
๐ญ Our Factory & Quality Certifications
Handan Boen Fastener operates a 12,000 mยฒ facility with 50+ production lines. Every batch of 6-32 x 3/8 socket head cap screw and 6-40 socket head cap screw is 100% inspected.
๐ Trusted by global brands and engineering firms
๐ฌ What Our Customers Say
Real feedback from procurement and engineering professionals who use our 6-32 x 3/8 socket head cap screw and 6-40 socket head cap screw.
Michael Torres
Procurement Manager, US-based automotive parts manufacturer
โWe switched to Boen for our 6-32 x 3/8 socket head cap screw supply. The quality is consistent, the pricing is 22% lower than our previous supplier, and the lead times are 18 days average. We've placed 6 repeat orders.โ
Elena Vogt
Technical Director, German industrial equipment company
โWe needed 6-40 socket head cap screw in 316 stainless with full traceability. Boen provided MTCs, heat numbers, and plating reports without hesitation. The parts passed our 100% dimensional inspection.โ
James Chen
Operations Manager, Singapore-based automation systems integrator
โBoen's customer service is outstanding. They helped us select the right grade and coating for our application, and the 6-32 x 3/8 socket head cap screw arrived 4 days early. We've reduced our fastener cost by 30%.โ
๐ Real Conversations, Real Trust
See how we help customers worldwide with their 6-32 x 3/8 socket head cap screw and 6-40 socket head cap screw needs.
๐ฌ Client inquiry โ 6-40 socket head cap screw with custom plating
๐ฌ Order confirmation โ 6-32 x 3/8 socket head cap screw, 50,000 pcs
๐ฌ After-sales follow-up โ customer feedback on quality
โ Frequently Asked Questions
Quick answers to the most common questions about 6-32 x 3/8 socket head cap screw and 6-40 socket head cap screw.
๐น What is the difference between 6-32 and 6-40 socket head cap screws?
The 6-32 x 3/8 socket head cap screw has a UNC thread (32 TPI), while the 6-40 socket head cap screw has a UNF thread (40 TPI). UNF threads are finer and offer better vibration resistance โ ideal for automotive and precision applications.
๐น What grades do you offer for these screws?
We supply Grade 8.8, 10.9, and 12.9 in alloy steel, plus 304 and 316 stainless steel. All grades are fully heat-treated and certified. Grade 12.9 is our most popular for high-strength applications.
๐น What is the minimum order quantity (MOQ)?
For standard 6-32 x 3/8 socket head cap screw and 6-40 socket head cap screw, our MOQ is 5,000 pcs per SKU. For custom lengths or platings, MOQ is 10,000 pcs. We can also accommodate smaller trial orders.
๐น What shipping methods do you use?
We ship via sea freight (FOB/CIF), air freight, and express courier (DHL, FedEx, UPS). For orders under 200 kg, express is most cost-effective. We provide full tracking and customs documentation.
๐น Can you provide samples before bulk order?
Yes, we offer free samples for standard 6-32 x 3/8 socket head cap screw and 6-40 socket head cap screw. You pay only the shipping cost. Sample lead time is 3โ5 days after confirmation.
๐น How do you ensure quality consistency?
We follow a 3-stage inspection: in-process (cold forging, threading), post-heat treatment (hardness, tensile), and final (dimensional, visual). Each batch includes a Material Test Certificate (MTC) per EN 10204.
๐น What is your typical lead time?
Standard lead time is 15โ25 days from order confirmation. For urgent orders, we offer express production at 10โ15 days. Shipping time varies by destination (3โ7 days express, 15โ30 days sea).
๐น What payment terms do you accept?
We accept T/T (30% deposit, 70% before shipment), L/C, and PayPal for sample orders. For established customers, we can discuss more flexible terms. All transactions are secured and documented.
๐ Ready to Secure Your Supply of Premium Socket Head Cap Screws?
Get factory-direct pricing on 6-32 x 3/8 socket head cap screw and 6-40 socket head cap screw โ with full traceability, fast delivery, and dedicated support.
๐ About the Author โ David Liang
Senior Fastener Engineer & International Trade Specialist โ David has 14 years of experience in precision fastener manufacturing and export. He oversees quality control at Handan Boen Fastener and has personally helped 200+ B2B clients across 30 countries select the right socket head cap screws for their applications. His technical articles are referenced by GlobalFastenerNews.com and FastenerTechnology.com.
