50 Pack of 3/8″-16 Grade 8 Serrated Flange Nuts Heavy Duty SAE J995 0.375″
Standard 3/8″-16 Coarse Thread: Designed for common coarse-thread bolts used in heavy-duty assemblies. SAE J995 Material and Physical Properties. ASTM F812 Surface Discontinuities. HRC 25/36. SAE Grade 8 Alloy Steel: Built for strength, durability, and resistance to loosening under load.