Used on engine,aircraft tf33-p-3/5/9(c/ec-135,b-52h);engine,aircraft tf33-pw-102(c-135,ec-135h/k/p);engine,aircraft, j57 all models(c-135,ec-135,b-52);engine,aircraft,tf-33-p-7(c-141a/b);aircraft,t-39;gun,5-in/54cal,mk-42&45;engine.aircraft,t56-a-7/15(c-130b/e/h/n/p);engine,aircraft,j85-ge-5/13(f-5a/b,t-38a);spuance class dd (963);guided missile launching system,mk 26(gmls). 0.795" center hole diameter