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ARP water pump bolt kit (studs, 12-point, black oxide), 5/16-24 × 57.15 mm
ARP water pump bolt kit (studs, 12-point, black oxide), 5/16-24 × 57.15 mm.
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ARP-100-3221
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ARP water pump bolt kit (studs, 12-point, black oxide), 5/16-24 × 57.15 mm.
ARP bolt or stud kit for a specific engine. Threads are rolled after heat treatment, and the kit includes nuts and washers as listed in the catalogue.
- Thread: 5/16-24
- Length: 57.15 mm
- Material: ARP 8740 chrome moly steel
- Manufacturer description: ARP 5/16-24x2.250 black 12pt WP pully w/1.000″ fan spcr stud
- Version: studs, 12-point, black oxide
- Manufacturer part number: ARP-100-3221
ARP (Automotive Racing Products, California) has made bolts and studs for racing engines since 1968. Threads are rolled after heat treatment for better fatigue strength.
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