Brand: Automotive Racing Products (ARP)
This high-strength (170,000 psi) stainless steel nut is a perfect match for ARP 1/4-28 Stainless Steel Bolt 5-Packs (sold separately).
The 1/4-28 UNF (fine thread) nut takes a 5/16" 12-point socket, but it has a full 0.433" (7/16" nominal) OD bearing surface. Head measures 0.300" high overall. The corrosion-resistant stainless steel has a polished finish that looks great and is easy to clean. Sold individually.