Used on tank, combat, ft, 120mmgun (m1a1); armored vehicle launch bridge (m60a1 & m48a5); tank, m-60 series; tank, abrams m-1. 2a 1st end thread class 5420-00-889-2020; weapon system essential unf 1st end thread series
3a all ends thread class 18 1st end thread quantity per inch one 0.070 in. dia lockwire hole drilled thru one point of hex horizontally passivate surface treated unjf 2nd end thread series
Used on x2m assault amphibious vehicle, command (aavc-7a1). 2a all ends thread class 12 2nd end thread quantity per inch passivate surface treated un 2nd end thread series
3a all ends thread class 12 1st end thread quantity per inch w/special cres lockring which is driven into port bore to keep adapter from rotating unj 1st end thread series
