1/2-20 x 1 1/2 Serrated Hex Flanged Washer Full Thread Screw Case Hard Zinc MISPPA2 They have a hex washer

They have a hex washer head and are designed to tap their own threads in metal

The 3/8-16 x 4 1/2 Phillips Pan Machine Screw Fully Threaded Zinc is a versatile and durable fastener designed for a wide range of applications

This means that the threads extend the entire length of the screw

5/16-18 x 2 Hex Tap Bolt Grade 8 Fully Threaded Plain is a high-strength fastener designed for demanding applications

These 8-18 x 1/2-inch unslotted hex washer serrated self-drilling screws are made of 18-8 stainless steel and are fully threaded

1/2-20 x 1 1/2 Serrated Hex Flanged Washer Full Thread Screw Case Hard Zinc MISPPA2 They have a hex washerThe 1 2 20 x 1 1 2 Serrated Hex Flanged Washer Full Thread Screw Case Hard Zinc is a high quality screw that is designed for use in a variety of applications. It is made from steel and has a zinc coating for added durability. The screw has a serrated hex flange head that provides a secure grip and prevents it from slipping. The full thread design allows for maximum holding power. The screw is case hardened for added strength and durability.