Used on nsn 4210-01-486-1035 tfft (tactical fire fighting truck); family of hemtt vehicles (heavy expanded mobility tactical trucks); 2320-01-304-2277 and 2320-01-304-2278 pls (palletized loading system). 2a thread class right-hand 0.750" thread length pan head style 32 thread quantity per inch zinc surface treated unc thread series