Brand: Automotive Racing Products (ARP)
Hardened, parallel-ground ARP stainless steel washers are a great match for ARP1/4-20 UNC Stainless Bolts or ARP 1/4-28 UNF Stainless Bolts.
These 1/4" ID washers have a slightly oversized 0.550" OD that is larger than the 1/2" OD of AN960 washers but much smaller than the 1 1/8" OD of AN970 washers. The ID is chamfered on one side for clearance on certain "super-strength" bolts, but they can be used with just about any 1/4" bolt. The 0.075" thickness is just a hair thicker than a standard AN960 washer. Polished corrosion-resistant stainless steel. Sold individually.
| 1/4" Washer Comparison |
| Washer | OD | Thickness |
| AN960-416 | 0.500" | 0.063" |
| ARP400-8505 | 0.550" | 0.075" |
| AN970-4 | 1.125" | 0.063" |
