MS90496B, MILITARY STANDARD: ROPE TYPE THREAD FORM FOR DRILL RODS, COUPLINGS, BITS, AND SHANKS FOR DRIFTER DRILLS (24 JAN 1983)
MS90496B, MILITARY STANDARD: ROPE TYPE THREAD FORM FOR DRILL RODS, COUPLINGS, BITS, AND SHANKS FOR DRIFTER DRILLS (24 JAN 1983).