part number: MS20500-428 MS20500-428 SELF-LOCKING NUT Self-locking hexagon nut For temperatures up to 1,200° F Material: Steel, silver plated Thread: 1/4-28 Supercedes part number 21247 Dimensions: A: 7/16 inch B: 21/64 inch C: 31/64... MSRP: Now: $3.02 Add to Cart part number: MS20500-428 MS20500-428 SELF-LOCKING NUT MSRP: Now: $3.02 Add to Cart Compare Selected