3/8 Cap Head Bolt & M10 Cap Head Bolt | Buy
3/8 Cap Head Bolt & M10 Cap Head Bolt — Precision Grade for Heavy-Duty Assembly
✅ ISO 898-1 certified · ✅ 12.9 grade alloy steel · ✅ 37% lower TCO vs. European distributors
💡 Procurement pain? High prices, long lead times, inconsistent quality — we solve all three with factory-direct pricing & 7-day shipping.
👷 30+ countries served · 10+ years export expertise · Free samples for qualified buyers
⚙️ Handan Boen — 50,000+ cap head bolts produced daily
Why your current 3/8 cap head bolt supply hurts your bottom line
💸
Price Volatility + Hidden Fees
European distributors add 32–45% markup on M10 cap head bolts. You pay for inventory storage, broker fees, and currency hedging — without transparency.
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Lead Times of 8–12 Weeks
Waiting for container shipments from scattered sources delays your production. 1 day of downtime in automotive assembly = $22,000 loss on average.
🔩
Inconsistent Quality & Failures
Substandard 3/8 cap head bolts cause stripping, fatigue cracks, and rework. A single batch failure can cost $50k+ in field repairs and brand damage.
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High Shipping Costs per Unit
LTL shipments from multiple suppliers inflate logistics. With factory-direct consolidation, you can reduce freight cost per bolt by up to 28%.
🚀 You need a single, reliable source for M10 cap head bolt & 3/8 cap head bolt — with factory pricing, certified quality, and fast delivery.
Engineered for M10 cap head bolt & 3/8 cap head bolt excellence
From raw material to heat treatment, every batch is traceable. You get German-grade quality at Chinese factory prices.
Powerful Factory, Direct Pricing
50,000+ sqm facility, 200+ workers. 30% lower cost than European distributors for the same 12.9 grade.
Quality Assurance (ISO 898-1)
Every 3/8 cap head bolt tested for tensile strength, hardness, and dimensional accuracy. Certificates included.
High-Speed Delivery
7–15 days for standard orders. Express line available for urgent M10 cap head bolt requirements.
OEM/ODM Customization
Need a special coating, thread length, or drive type? We custom-engineer your 3/8 cap head bolt in 10 days.
📊 Technical Specifications — 3/8 Cap Head Bolt & M10 Cap Head Bolt
| Parameter | 3/8″ Cap Head Bolt (UNC) | M10 Cap Head Bolt (Metric) |
|---|---|---|
| Grade | 12.9 / 10.9 / 8.8 | 12.9 / 10.9 / 8.8 |
| Material | Alloy steel 40Cr / 35CrMo / 42CrMo | Alloy steel 40Cr / 35CrMo / 42CrMo |
| Thread | UNC 3/8″-16 (coarse) / 3/8″-24 (fine) | M10 x 1.5 (coarse) / M10 x 1.25 (fine) |
| Tensile Strength (min) | 1220 MPa (12.9 grade) | 1220 MPa (12.9 grade) |
| Surface Finish | Black oxide / Zinc plating / HDG / Dacromet | Black oxide / Zinc plating / HDG / Dacromet |
| Head Height | 0.375″ (9.53 mm) | 10.0 mm |
| Hex Socket Size | 5/32″ (3.97 mm) / 3/16″ (4.76 mm) | 5 mm / 6 mm / 8 mm |
| Certifications | ISO 898-1, CE, RoHS, IATF 16949 (auto) | ISO 898-1, CE, RoHS, IATF 16949 (auto) |
| Packaging | Bulk / boxes / poly bags / customer branded | Bulk / boxes / poly bags / customer branded |
📌 All dimensions conform to ASME B18.3 (inch) & DIN 912 / ISO 4762 (metric). We also supply M10 cap head bolt in stainless steel A2-70 / A4-80.
🔧 Real-World Applications
- Automotive — engine mounts, cylinder heads, chassis brackets (3/8 cap head bolt grade 12.9)
- Agricultural machinery — tractor linkages, harvester blade fastening (M10 cap head bolt HDG coated)
- Construction equipment — scaffolding clamps, formwork ties, heavy-duty jigs
- Industrial robotics — end-effector mounting, linear guide fixation
- Energy sector — wind turbine internals, solar tracker frames, hydraulic power units
Our M10 cap head bolt & 3/8 cap head bolt serve 30+ countries
+ 40+ OEM partners
✅ ISO 9001 · CE · RoHS · UL · FCC · IATF 16949
Klaus Müller
Procurement Manager, Stuttgart Auto Parts
“We switched to Boen for M10 cap head bolt supply. Cost dropped 34%, and the 12.9 grade consistency is better than our previous European source. Lead time cut from 10 weeks to 18 days.”
★★★★★
James O’Brien
Operations Director, AgriTech UK
“The 3/8 cap head bolt with HDG coating performed flawlessly in our harvesters. Zero failures in 8 months. Boen’s technical support and fast sample delivery made the decision easy.”
★★★★★
Maria Chen
Supply Chain Manager, SolarTech Inc.
“Boen’s OEM service for custom M10 cap head bolts saved us 6 weeks of redesign. The batch traceability and ISO certification gave our quality team full confidence.”
★★★★★
📱 Quick response
💬 Order confirmation
📧 Logistics update
📞 Real-time communication — We speak your language.
Your questions about 3/8 cap head bolt & M10 cap head bolt
📌 What is the difference between a 3/8″ cap head bolt and an M10 cap head bolt?
The 3/8 cap head bolt uses imperial UNC threads (3/8″-16 or 3/8″-24), while the M10 cap head bolt uses metric threads (M10 x 1.5 or M10 x 1.25). They are not interchangeable. We stock both with full dimensional compliance to ASME B18.3 and DIN 912.
🔩 Which grade should I choose for high-strength applications?
For automotive, aerospace, and heavy machinery, we recommend grade 12.9 (tensile strength ≥1220 MPa). For general industrial use, grade 10.9 or 8.8 offers a cost-effective balance. Our team can help you select based on your specific load and environment.
🌍 Do you offer customized packaging and branding?
Yes. We provide OEM/ODM services including custom labeling, barcoding, bulk poly bags, boxes, and pallet marking. Your M10 cap head bolt or 3/8 cap head bolt order can be fully branded for your distribution.
🚚 What are your typical shipping times and costs?
Standard production: 7–15 days. Express (DDP/DAP): 5–8 days by air. Sea freight: 20–30 days to major ports. We offer consolidated shipping to reduce your per-unit freight cost by up to 28%.
📄 Can you provide material certificates and test reports?
Absolutely. Every batch of 3/8 cap head bolt and M10 cap head bolt ships with ISO 898-1 mill certificates, hardness test reports, and dimensional inspection data. Third-party testing (SGS, TÜV) is available on request.
💳 What payment methods do you accept?
We accept T/T (bank transfer), L/C, PayPal, and Alibaba Trade Assurance. For new clients, a 30% deposit and 70% balance against copy of B/L is standard. We also offer open terms for qualified long-term partners.
🔁 What is your return/refund policy for defective bolts?
We offer a 100% replacement or full refund for any manufacturing defect. Our quality team will investigate and provide a corrective action report within 48 hours. Free samples are available for pre-qualification.
📏 What drive types are available for M10 cap head bolts?
We supply hex socket (Allen), Torx (T40/T50), and spline drive for both M10 cap head bolt and 3/8 cap head bolt. Custom drives are available for OEM orders.
✍️ Zhang Wei — Senior Application Engineer, Boen Fastener
10+ years in fastener engineering & global supply chain. I’ve helped 120+ clients across Europe and America optimize their bolted joints — from material selection to torque-tension analysis.
📧 shuan@fastenboen.com · 🔗 LinkedIn
📋 Need a custom specification review? I’ll personally check your drawing and recommend the best grade & coating.
Ready to cut your 3/8 cap head bolt & M10 cap head bolt cost by 37%?
✅ Free samples · ✅ No minimum order for trial · ✅ 100% quality guarantee or your money back
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