1/2-20 x 1 1/2 Fine Thread Socket Head Cap Screw Black DFAR DQFD They have a flat undercut

They have a flat undercut head that provides a flush finish when driven into metal

The ribbed body provides excellent grip and prevents the rivet nut from spinning in the hole

this screw offers maximum holding power and is suitable for use in various materials

and is ideal for projects that require a strong and durable fastener

1/2-20 x 1 1/2 Fine Thread Socket Head Cap Screw Black DFAR DQFD They have a flat undercut1 2 20 x 1 1 2 Fine Thread Socket Head Cap Screw Black DFAR is a high strength, corrosion resistant fastener designed for use in demanding applications. It features a 1 2 20 fine thread, which provides a secure and vibration resistant hold. The black oxide finish provides excellent corrosion resistance, while the socket head design allows for easy installation and removal. This screw is compliant with the Defense Federal Acquisition Regulation