50 Pack of 3/8″-16 Nylon Lock Nuts Grade C Heavy Duty SAE J995 0.375″
Standard 3/8″-16 Coarse Thread: Compatible with common 3/8″-16 Grade 5 and Grade 8 bolts. Nylon is resistant to temperatures up to 250° F. SAE J995 Material and Physical Properties. IFI 100/107 Material and Physical Properties.