PFC 5/16"-18 NC Grade A Finished Hex Nuts Zinc Plated - 100 per Box
• Nuts for 5/16" Diameter with 18 NC Thread (National Course) Bolts
• Grade A Low Carbon Steel Hex Nut (Meets ASTM A563 & ASME / ANSI B18.2.2)
• Zinc Plated to meet ASTM F1941 FeZn3A
• 100 per Box
PFC Hex Nuts - Fasteners are typically made of low-carbon steel. Coarse threads are better when working with brittle materials; they are sturdier and are easier to thread and unthread compared to fine. Coarse threading also allows for thicker coatings and platings.