Heavy-Duty Hot Dip Galvanized Bolts | DIN 933, ISO 4017, ASTM A325 Structural Fasteners | Longze
โรงงานของเราเอง
ตัวอย่างเกรดสลักเกลียวหกเหลี่ยม 8.8 ฟรี
carton , pallet or customizable
Product Title
Heavy-Duty Hot Dip Galvanized Bolts | DIN 933, ISO 4017, ASTM A325 Structural Fasteners | Longze Factory
Product Summary
Longze Heavy-Duty Hex Bolts are engineered for high-load structural connections. Manufactured in Yongnian, China, we specialize in high-tensile fasteners for global infrastructure projects.
✔ High Strength: Grade 8.8, 10.9, and ASTM A325/A490 available.
✔ Superior Coating: Hot Dip Galvanized (HDG) ≥55μm for 30+ years of rust protection.
✔ Fast Response: 12-hour technical quotation and MTC support.
Standards: DIN 933 (Full Thread), DIN 931 (Half Thread), ISO 4017, ASTM A325.
Diameter Range: M6 to M64 | 1/4" – 2-1/2".
Grade: 8.8, 10.9, 12.9 | ASTM A325 Type 1 | ASTM A193 B7.
Surface Finish: HDG, Zinc Plated, Dacromet, Geomet, Black Oxide.
- Match your steel structure thickness with the correct Hex Bolt size and length for a secure assembly.
| Thread Size | มาตรฐาน | Grip Length (mm) | Recommended Bolt Length (mm) | Best Applications |
|---|---|---|---|---|
| เอ็ม12 | DIN 933 | 10 – 40 | 50 – 80 | Light steel structures |
| M16 | DIN 933 | 20 – 80 | 100 – 150 | Secondary beams |
| เอ็ม20 | ASTM A325 | 30 – 120 | 120 – 200 | Primary structural nodes |
| M24 | ASTM A325 | 50 – 180 | 160 – 250 | Heavy bridge girders |
| M30 | ISO 4017 | 80 – 250 | 220 – 400 | High-rise infrastructure |
| M36 | ISO 4017 | 100 – 350 | 300 – 500 | Industrial foundations |
| Thread Size | Pitch (mm) | Standard Length (mm) | Head Width (A/F) | Recommended Grade |
| เอ็ม12 | 1.75 | 30 – 150 | 18mm / 19mm | Grade 8.8 HDG |
| M16 | 2.0 | 40 – 200 | 24mm | Grade 8.8 / 10.9 |
| เอ็ม20 | 2.5 | 50 – 300 | 30mm | ASTM A325 / 10.9 |
| M24 | 3.0 | 60 – 400 | 36mm | Structural Grade |
| M30 | 3.5 | 80 – 500 | 46mm | High Tensile B7 |
- Use this guide to select the optimal material based on your project's load and environment.
| Material Grade | Tensile Strength | Yield Strength | ความต้านทานการกัดกร่อน | Best Applications |
| Grade 8.8 | 800 MPa | 640 MPa | Good (HDG) | General Steel Structure |
| Grade 10.9 | 1040 MPa | 940 MPa | Superior (HDG) | Bridges, Heavy Machinery |
| ASTM A325 | 120 ksi | 92 ksi | High (HDG) | Structural Buildings |
| ASTM A193 B7 | 125 ksi | 105 ksi | Excellent (PTFE) | Oil & Gas, Flanges |
Avoid Pitfalls:
Hydrogen Embrittlement Control: Specialized baking for Grade 10.9+ fasteners after plating to prevent sudden fracture.
Thread Tolerance Management: Precision over-tapping for HDG nuts ensures zero seizing on site.
Raw Material Traceability: 100% chemical verification for every heat number.
Perfect Fit Assembly:
Complete Sets: Matching high-strength heavy hex nuts and structural washers provided.
Standard Compliance: Strict adherence to DIN/ISO/ASME head dimensions for perfect tooling fit.
Extreme Condition Adaptation:
High Corrosion Defense: HDG ≥55μm for marine and industrial C5-M environments.
Temperature Resilience: B7 and Grade 10.9 maintain structural integrity under extreme loads.
Quality Control & Logistics:
ISO 9001 Certified: 5-step QC from raw material to final dimension check.
Sea-Worthy Packaging: Reinforced cartons + Fumigation-Free Pallets for safe maritime transit.
Q: Can you provide MTC (Mill Test Certificates)? A: Yes, full traceability and MTC are provided for every batch.
Q: What is the lead time for A325 HDG bolts? A: Standard sizes are typically shipped from our Yongnian factory within 10–15 days。
- Planning a heavy-duty steel structure? Don't risk your project on low-grade fasteners. Send your requirements → Get an expert bolt recommendation + quote within 12 hours.
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