B5/16-18 x 4 MS90728, Alloy Steel B1821 Coarse Cap Screw Per ASTM A354BD Zinc Yellow DFAR 1PT and it has a wax

and it has a wax coating for smooth insertion

It is designed for use in metal applications and features a unique thread-forming design that eliminates the need for tapping

These 10-16 x 1 Slot Ind HWH 1/4" Across Flats F/T Self Piercing Scr 18-8 Stainless Steel screws are designed for use in a variety of industrial applications

* Coating: Zinc & wax

The undercut design helps to prevent the screw from backing out

B5/16-18 x 4 MS90728, Alloy Steel B1821 Coarse Cap Screw Per ASTM A354BD Zinc Yellow DFAR 1PT and it has a waxB5 16 18 x 4 MS90728 is a coarse thread cap screw made of alloy steel B1821, meeting the specifications of ASTM A354BD. It has a diameter of 5 16 inches, a length of 4 inches, and a zinc yellow dichromate finish. This screw is designed for use in high strength applications, such as in machinery, automotive, and construction industries. It provides excellent corrosion resistance and durability, ensuring a secure and reliable connection.