2a thread class right-hand 0.291" thread length flat countersunk head style 32 thread quantity per inch top of head red cadmium surface treated unf thread series
3a thread class right-hand 0.3125" grip length 32 thread quantity per inch 108000 single pounds per square inch shear strength furnished w/undersized thd dia unjc thread series
spring cup material is carbon stlper astm A109:spring material is wire-steel per qq-w-470 (music wire) :cross-pin material is carbon stl per qq-w-470 (music wire) cadmium surface treated