Aviation AN4 Bolt

AN4 Hex Head Airframe Bolts feature a 1/4-28 tread size and come in either drilled or undrilled shank versions. The drilled shank version is designed for a 1/16 in. diameter cotter pin. The undrilled shank is designed for use with a self locking nut. Made of Cadmium plated carbon steel for corrosion resistance.