B1/2-13 x 4 1/4 MS90728, Alloy Steel B1821 Coarse Cap Screw Per ASTM A354BD Zinc Yellow DFAR DQRW17DBPT The indented hex head allows

The indented hex head allows for easy driving and prevents slippage

The K lock nut features a unique design with a nylon insert that prevents loosening due to vibration or movement

The 1/4-20 x 3 1/4 Slotted Flat Machine Screw Fully Threaded Zinc is a versatile and durable fastener designed for a wide range of applications

These 14-8 x 2 1/2 Bugle Square Drive Coarse Thread Type 17 Point Deck Screws are made of 18-8 stainless steel

They are made of black zinc-plated steel for corrosion resistance and have a sharp point for easy penetration

B1/2-13 x 4 1/4 MS90728, Alloy Steel B1821 Coarse Cap Screw Per ASTM A354BD Zinc Yellow DFAR DQRW17DBPT The indented hex head allowsThe B1 2 13 x 4 1 4 MS90728 is an Alloy Steel B1821 Coarse Cap Screw Per ASTM A354BD Zinc Yellow DFAR. It has a diameter of 1 2 inch, a length of 4 1 4 inches, and a thread pitch of 13 threads per inch. The screw is made of alloy steel and has a zinc yellow chromate finish. It is designed to meet the requirements of ASTM A354BD and is compliant with the Defense Federal Acquisition Regulation Supplement (DFARS).