MIL-W-81840, MILITARY SPECIFICATION: WHEELS, PEENING, ROTARY FLAP (09 FEB 1972) [NO S/S DOCUMENT]
MIL-W-81840, MILITARY SPECIFICATION: WHEELS, PEENING, ROTARY FLAP (09 FEB 1972) [NO S/S DOCUMENT]., This specification covers rotary flap wheels used with portable equipment for peening of metal parts.