Global supplier of precision-engineered ASME B18.31.1M-compliant bolts, backed by GMP-certified production and scalable OEM/ODM solutions.
When you need bolts that meet rigorous industrial standards, ASME B18.31.1M Bolts deliver unmatched reliability. Designed for heavy machinery, energy infrastructure, and harsh environments, these high-strength fasteners combine strict dimensional accuracy with superior load-bearing capacity. Whether you’re assembling wind turbines or maintaining oil rigs, our bolts ensure long-term performance under extreme stress, vibrations, and corrosion.
| Parameter | Specification |
|---|---|
| Standard | ASME B18.31.1M |
| Diameter Range | M6 to M64 |
| Length Range | 20mm to 500mm |
| Thread Type | Metric Coarse/Fine, UNC, UNF |
| Strength Grade | Grade 8.8, 10.9, 12.9 |
| Tolerance | ±0.05mm (precision-machined) |
From offshore platforms to wind farms, ASME B18.31.1M Bolts withstand high torque, temperature fluctuations, and fatigue. Grade 12.9 variants offer exceptional tensile strength for critical connections.
Pre-certified to meet ASME, ISO, API, and regional standards (e.g., PED, NACE MR0175), our bolts simplify approvals for international projects.
With 50,000+ metric tons in stock, we ship standard specs in 7–15 days. Bulk pricing reduces costs without compromising quality.
✅ GMP-Certified Production: Every batch undergoes 100% dimensional checks and material traceability.
✅ R&D Expertise: Prototype custom designs in 7 days using advanced CNC machining.
✅ Sustainable Practices: Eco-friendly coatings and recyclable packaging align with ESG goals.
✅ Global Logistics: Regional warehouses in the US, EU, and Middle East ensure JIT delivery.



Q: Can you customize bolts beyond standard ASME B18.31.1M specs?
A: Absolutely! Our team adapts materials, threads, and coatings for unique requirements.
Q: How do you ensure corrosion resistance?
A: Coatings like hot-dip galvanizing are tested per ISO 9227 salt spray standards.
Q: What certifications do you provide?
A: We include material test reports (MTRs) and compliance certificates with every order.
Q: What's the MOQ?
A: 1,000 units for standard specs. No MOQ for custom projects—contact us for details.
📧 Email: info@sxqinsteel.com
Trusted by industrial leaders worldwide, our ASME B18.31.1M Bolts are your solution for durable, compliant fastening. Let’s engineer reliability together.
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