8-18 x 3 1/2 Square Drive Flat Trim Head Self Drilling Screw Full Thread Zinc D985A4 This 1/4-20 x 3 Unslotted

This 1/4-20 x 3 Unslotted Indented Hex Washer Head Machine Screw is a fully threaded screw with a black oxide finish

The bolt is made of steel for strength and durability and meets ASTM A307 specifications

With its exceptional strength

while the JISB 1111 Class 4

8-18 x 3 1/2 Square Drive Flat Trim Head Self Drilling Screw Full Thread Zinc D985A4 This 1/4-20 x 3 UnslottedThese 8 18 x 3 1 2" Square Drive Flat Trim Head Self Drilling Screws are designed for use in a variety of applications, including metal to wood, wood to wood, and metal to metal. They feature a square drive head for easy installation, a flat trim head for a clean finish, and a self drilling tip that eliminates the need for pre drilling. The full thread design provides maximum holding power, and the zinc coating offers excellent corrosion resistance.