3a 2nd end thread class 12 2nd end thread quantity per inch adapter od has flatted ends, 1.950 in.w across flats paint or paint heat resistant surface treated un 2nd end thread series
Used on aircraft application. 3a all ends thread class 2.000" overall length bulkhead thread on fluid end connection; coupling half anodized dark gray anodize body surface treated male coupling half unf all ends thread series
3a all ends thread class 3.074" overall length center circular flange, 2.490 in.min, 2.501 in.max dia, 6 bolt holes with 0.196 in.min, 0.206 in.max dia, cres qq-s-636, passivated; first end bulkhead thd 0.875-14 unf-3a male coupling half unf all ends thread series
