Used on ship, ohio class ssn (trident). 3a all ends thread class 20 all ends thread quantity per inch passivate surface treated flareless (tube) un all ends thread series
Used on helicopter, ch-53a/d/e. 3b 1st end thread class 12 1st end thread quantity per inch grumman aerospace corp A10 aircraft anodize inside surface treated unj 1st end thread series
3a all ends thread class 2.230" overall length fluid end bulkhead connection anodize body surface treated male coupling half unjf all ends thread series
3a all ends thread class 2.860" overall length 12 first quick disconnect end thread quantity per inch fluid end internally, thd, fitting boss, thd size 1.0625-12 unj, per MS33649 anodize body surface treated male coupling half un all ends thread series
