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- ARP 12-point Nuts
- ARP Bolts (Stainless)
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Grade 9 Collar Locknut

The Grade 9 Bolting system develops the highest clamp force available in a standard bolt/nut assembly and it is frequently referred to by one of the folowing trade names: L9, PFC9, or F911. Special Alloy steels and heat treatments are used to achieve 180,000 psi tensile strength.

COLLAR GR 9 COARSE

USS (Coarse Thread)

COLLAR GR 9 FINE

SAE (Fine Thread)

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