tf39 engine end item identification, steel,ams 5759;case hardened; length 0.930 in. min 0.970 in. max; style is tubular with rectangular shoulder;shoulder length is 0.240 in. min 0.260 in. max;shoulder location 0.180 in. from first end 0.530 in. fr om second end;shoulder has two 0.610 in. dia holes;first hole center locat ed 0.060 in. from shoulder end and 0. 125 in. from sides;second hole center 0.080 in. from shoulder end 0.125 in. from sides;first end 0.180 in. lg 0. 251 in. od 0.198 in. id with 0.230 in. dia by 102 degree csk;second end 0.5 30 in. lg 0.251 in. od 0.198 in. id general characteristics item description