UNF A2 Stainless Steel Nyloc Nylon Lock Nuts - 3/16" To 3/4". Thread - UNF (AF). Material - A2 Stainless Steel (For increased corrosion resistance). 1/4" 7/16" 5/16" 28. Type - P Type (Tall). 9/16" 7/8" 21/32" 18.
eBay