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The A2-70 screws have a tensile strength of up to 700 MPa, while the A4-80 grade reaches over 800 MPa, making them suitable for demanding applications.
These screws have passed 500 hours of salt spray testing, ensuring durability in harsh environments. Ideal for both indoor and outdoor installations, they excel in marine and chemical applications where strength and corrosion resistance are critical.
| Name | Hex socket head screw bolts | Materials | Carbon Steel/Stainless Steel |
| Standards | DIN ISO ANC BSW JIS etc. | Strength level | 4.8 8.8 10.9 12.9 A2-70 A4-70 A4-80 |
| Size | M3-M50 | Surface finish | ZPHDGBLACKDacromet etc. |
| Length | 15-500 | Samples | Available |
| Thread specification | M3 | M4 | M5 | M6 | M8 | M10 | M12 | M16 | |
| d | |||||||||
| P | pitch | 0.5 | 0.7 | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 |
| a | maximum value | 1 | 1.4 | 1.6 | 2 | 2.5 | 3 | 3.5 | 4 |
| minimum | 0.5 | 0.7 | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | |
| dk | maximum value | 5.7 | 7.6 | 9.5 | 10.5 | 14 | 17.5 | 21 | 28 |
| minimum | 5.4 | 7.24 | 9.14 | 10.07 | 13.57 | 17.07 | 20.48 | 27.48 | |
| e ① | minimum | 2.3 | 2.87 | 3.44 | 4.58 | 5.72 | 6.86 | 9.15 | 11.43 |
| k | maximum value | 1.65 | 2.2 | 2.75 | 3.3 | 4.4 | 5.5 | 6.6 | 8.8 |
| minimum | 1.4 | 1.95 | 2.5 | 3 | 4.1 | 5.2 | 6.24 | 8.44 | |
| s | Nominal | 2 | 2.5 | 3 | 4 | 5 | 6 | 8 | 10 |
| maximum value | 2.045 | 2.56 | 3.071 | 4.084 | 5.084 | 6.095 | 8.115 | 10.115 | |
| minimum | 2.02 | 2.52 | 3.02 | 4.02 | 5.02 | 6.02 | 8.025 | 10.025 | |
| t | minimum | 1.04 | 1.3 | 1.56 | 2.08 | 2.6 | 3.12 | 4.16 | 5.2 |
| Minimum tensile load (N) | Level 12.9 | 4910 | 8506 | 13800 | 19600 | 35700 | 56600 | 82400 | 154000 |
Befast’s A2-70 304 screws provide a cost-effective option for general use with high tensile strength, while A4-80 316 screws offer advanced protection against saltwater and chemicals, ideal for corrosive environments. With up to 15% greater strength than standard stainless screws, these fasteners ensure secure, long-term connections.
Each screw undergoes rigorous quality checks, meeting strict industrial standards. Choose Befast for high-quality, high-performance screws tailored to challenging applications.
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