5/8"-11 (USS) GRADE-8 ALLOY FLANGE NUT, PHOSPHATE& OIL FINISH (300-PACK)

PREVAILING TORQUE HEX FLANGE LOCK NUT

EQUIVALENT TO GRADE-G 

GRADE-8 150,000 PSI MINIMUM PROOF LOAD

PHOSPHATE AND OIL FINISH

USS (UNC) = COARSE THREADS

SAE (UNF) = FINE THREAD