1/4-20 x 1 1/2 Machine Screws / Unslotted / Hex Washer / Steel / Zinc Plating (Quantity: 2000 pcs)

Thread Diameter - Pitch: 1/4-20 Length: 1 1/2 The head and washer are combined into a single unit which spread out clamping force of the fastener on the joint. This fastener head is very similar to a hex flange head. Offers greater protection to the mating surface than a standard indented hex head. Increased bearing area reduces likelihood of crushing mating surfaces.