3/8-16 Square Machine Screw Nut Zinc M5 and the 40 indicates that

and the 40 indicates that the screw has a length of 40mm

Its high-quality construction ensures a secure and long-lasting hold

this screw features a galvanized finish for enhanced corrosion resistance

while the hex head provides a secure grip for driving

The 4-inch length provides ample reach for hanging fixtures

3/8-16 Square Machine Screw Nut Zinc M5 and the 40 indicates thatThis 3 8 16 square machine screw nut is made of zinc plated steel and is designed for use with 3 8 16 machine screws. It has a square shape and is slotted for easy installation. The zinc plating provides corrosion resistance and helps to prevent rust. This nut is ideal for use in a variety of applications, including automotive, construction, and manufacturing.