PRODUCT
Material: Carbon steel
Grade: Gr8.8
Finish: Hot Dip Galvanized
Standard: DIN603
Certification: ISO9001
MOQ:1000PCS
Samples: Free
Place of Origin: Zhejiang China
Product Details
Carriage Bolts are often used for connecting wood to wood, wood to metal and metal to metal。
At the Goshen hardware , we provide you with several high quality Carriage Bolts that are made from premium quality materials and different grades of stainless steel to ensure that these will last for long time.
• Standard: DIN 603 / ISO 8677 / ASME B18.5 equivalent
• Alias: Round-head square-neck bolt, coach bolt, mushroom-head bolt
| DIN603 | |||||
| Screw Thread d | Pitch P | k | s | ||
| min | max | min | max | ||
| M5 | 0.8 | 2.7 | 3.3 | 4.52 | 5.48 |
| M6 | 1 | 3.12 | 3.88 | 5.52 | 6.48 |
| M8 | 1.25 | 4.12 | 4.88 | 7.42 | 8.58 |
| M10 | 1.5 | 4.62 | 5.38 | 9.42 | 10.58 |
| M12 | 1.75 | 6.05 | 6.95 | 11.3 | 12.7 |
| M16 | 2 | 8.05 | 8.95 | 15.3 | 16.7 |
| M20 | 2.5 | 9.95 | 11.05 | 19.16 | 20.84 |
• Base steel: Low-carbon C1018–C1022 or medium-carbon C1035 (selectable)
• Property class: 4.8, 5.8, 6.8 or 8.8 (ISO) / Grade 2, 5 (SAE)
• Tensile strength: 420–830 MPa (grade dependent)
• Core hardness: HRB 70–95 (4.8) / HRC 22–32 (8.8)
• Elongation: ≥ 25 % – prevents brittle failure in dynamic loads
• Heat-lot traceability: EN 10204 3.1 mill certificate supplied
• Hot-dip galvanized per ASTM A153 / ISO 1461 – uniform zinc layer 45–80 µm
• Salt-spray performance: ≥ 1,000 h without red rust (ASTM B117)
• Suitable for long-term outdoor exposure, coastal, and high-humidity environments
• Size range: M5 – M24 / 1/4″ – 1″
• Length: 10 mm – 300 mm (non-standard lengths on request)
• Thread: half thread (DIN 603) – smooth shank beneath head improves shear capacity
• Square neck: 1.0–1.25 × shank diameter, forged to prevent rotation in square punched holes
