B5/16-18 x 4 1/4 MS90728, Alloy Steel B1821 Coarse Cap Screw Per ASTM A354BD Zinc Yellow DFAR ABW188B They have a round head

They have a round head with a Phillips drive and a sharp point for easy penetration

The heavy hex shape ensures a secure hold and prevents slippage

The 1/4-28 Cold Forged Wing Nut Zinc is a versatile and durable fastener designed for a wide range of applications

which means that it can create its own threads in the material being welded

This 8-32 x 3/16 slotted truss machine screw is fully threaded and made of zinc-plated steel

B5/16-18 x 4 1/4 MS90728, Alloy Steel B1821 Coarse Cap Screw Per ASTM A354BD Zinc Yellow DFAR ABW188B They have a round headB5 16 18 x 4 1 4 MS90728 is a 4 1 4 inch long coarse thread cap screw made of Alloy Steel B1821 and plated with zinc yellow in accordance with DFAR requirements. It meets the specifications of ASTM A354BD and has a diameter of 5 16 inches. This cap screw is designed for use in high strength applications and is commonly used in aerospace, automotive, and industrial settings. It provides excellent corrosion resistance and durability, making it suitable