This is an Aickinstrut flanged hex bolt. The unique molded design eliminates the need for a washer. This bolt is made of glass reinforced polyurethane and comes 25 to a bag. Part: 250PU-150 1/4" x 1-1/2" Hex Flange Bolt , Material: Glass-reinforced Polyurethane. Thread Shear: 110 lbs , Shank Shear: 210 lbs , Shoulder Length: 1/2" , Torque: 10 in/lbs , Includes: Pack of 25 Bolts.