Brand: Automotive Racing Products (ARP)
Hardened, parallel-ground ARP chrome moly washers are a great match for ARP 5/16-18 UNC Black Oxide Bolts or ARP 5/16-24 UNF Black Oxide Bolts.
These 5/16" ID washers have an undersized 0.550" OD that is just slightly smaller than the 9/16" OD of AN960 washers. The 0.095" thickness is almost like stacking one AN960-516L washer on top of a standard AN960-516 washer. These washers are flat on both sides, with no chamfer around the ID. Black oxide finish. Sold in packs of 10.
| 5/16" Washer Comparison |
| Washer | OD | Thickness |
| AN960-516l | 0.562" | 0.032" |
| AN960-516 | 0.562" | 0.063" |
| ARP200-8584 | 0.550" | 0.095" |
