MS51861A, MILITARY STANDARD: SCREW, TAPPING-THREAD FORMING, TYPE AB, PAN HEAD, CROSS-RECESSED (21-FEB-1961) [SUPERSEDING MS24621C] [S/S BY NASM51861]
MS51861A, MILITARY STANDARD: SCREW, TAPPING-THREAD FORMING, TYPE AB, PAN HEAD, CROSS-RECESSED (21-FEB-1961) [SUPERSEDING MS24621C] [S/S BY NASM51861].