3a thread class right-hand 0.335" thread length double hexagon extended washer head style 28 thread quantity per inch bolt, external wrenching, alloy steel, 450 degrees fahrenheit, 180-200 ksi has four 0.32 to 0.42 in. diameter holes in hex head cadmium surface treated unjf thread series
Used on interim armored vehicle (iav),contractor logistics support (cls). 2a thread class right-hand 1.600" thread length flat chamfer head style 18 thread quantity per inch unf thread series