1.Superior Performance - Geschmiedet aus mittlerem Kohlenstoff Legierungsstahl und wärmebehandelt bis ISO Grade 10,9, Grad 12,9 (≥ 1 040 MPa Zug, ≥ 940 MPa Ausbeute), liefert der hex-Flanschschraube sehr hohe Klemmkraft, während sein integrierter Flansch im Scheibenstil die Last verteilt und dem Lösen mit extremer Trag- und Scherfestigkeit widersteht Automobil, Maschinen und schwere Anwendungen. Die schwarze Phosphat / Schwarz-Zink-Beschichtung senkt die Oberflächenreibung, unterstützt die Drehmomentgenauigkeit und bietet einen moderaten Korrosionsschutz.

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.