Flanged Hex Head Bolt-Full Thread-Alloy Steel

描述

1.Superior Performance – Forged from medium-carbon alloy steel and heat-treated to ISO Grade 10.9，Grade 12.9 (≥ 1 040 MPa tensile, ≥ 940 MPa yield), the hex-flange bolt delivers very high clamp force while its integrated washer-style flange spreads the load and resists loosening with extreme load-bearing and shear resistance in automotive, machinery, and heavy-duty applications; The black phosphate / black-zinc coating lowers surface friction, aids torque accuracy and provides moderate corrosion protection.

For the coating, the surface treatment exceeds 96-hour salt spray resistance (vs. standard black oxide), preventing rust in marine, outdoor, or high-humidity environments. On operational performance: precision-engineered flange head (DIN6921 compliant) distributes pressure evenly, reduces vibration loosening, and protects soft surfaces like aluminum or plastics.

2.Broad Application Range – Commonly specified for automotive engines, transmissions, suspension and frame joints, heavy-duty equipment, steel fabrications, gearboxes and any high-vibration assembly where a built-in washer saves space and assembly time. Suitable for indoor or sheltered outdoor service temperatures from -50 °C to +300 °C including crush-proof storage case for easy organization.

3.Easy to Install – The one-piece serrated (or smooth) flange eliminates separate washers and centers the bolt in oversized holes. ISO coarse-pitch threads roll on smoothly, and the 6-point head accepts all standard sockets or impact drivers, enabling fast, high-torque tightening with consistent preload. Backed by lifetime warranty and 24/7 support for risk-free purchasing。

4.Proven Quality – Produced under ISO 9001 / IATF 16949 systems and fully compliant with ISO 4162 / DIN 6921 dimensions and ISO 898-1 mechanical requirements. Each lot is 100 % thread-gauge checked, hardness verified, crack-inspected, and salt-spray tested; EN 10204 3.1 material certificates and complete traceability provided on request, ensuring reliable, long-service performance.