MS9187C, MILITARY STANDARD: SCREW, MACHINE-CRES, DOUBLE HEXAGON EXTENDED WASHER HEAD, DRILLED, .138-40 (13 JULY 1987) [NO SUPERSEDING DOCUMENT].
MS9187C, MILITARY STANDARD: SCREW, MACHINE-CRES, DOUBLE HEXAGON EXTENDED WASHER HEAD, DRILLED, .138-40 (13 JULY 1987) [NO SUPERSEDING DOCUMENT].