6-40 x 3/8 Fine Thread Socket Head Cap Screw Black DFAR MBF8 It is a hexagonal-shaped nut

It is a hexagonal-shaped nut with a 3/8-inch diameter and a 16 threads per inch pitch

1 inch length

This 1/4-20 x 2 1/2 Slotted Indented Hex Washer Head Machine Screw Fully Threaded Zinc is a versatile fastener designed for a wide range of applications

while the Type U drive requires a special tool for installation

outdoor structures

6-40 x 3/8 Fine Thread Socket Head Cap Screw Black DFAR MBF8 It is a hexagonal-shaped nutThe 6 40 x 3 8 Fine Thread Socket Head Cap Screw Black DFAR is a high quality fastener designed for use in demanding applications. It is made from alloy steel and features a black oxide finish for corrosion resistance. The screw has a socket head drive, which allows for easy installation and removal. The fine thread design provides a secure hold in thin materials. This screw is compliant with the DFAR (Defense Federal Acquisition Regulation