- Joined
- Jun 7, 2013
- Messages
- 10,079
One must realize that there are bolts and then there are bolts, varying widely as to tensile strength, and finding a high tensile bolt with threads all the way up, is a remote possibility, and also, a puller should have a much thicker hex head on it than a normal bolt so that a wrench will stay put on it while operating the puller, I do agree that it should be turned from round and the hex milled on, if the milling is done with straddle cutters and can be indexed quickly, it is not at all time consuming. I also concur with an earlier comment, that ETD 150 is a good choice for the part; it has a higher tensile strength (150.000 psi) than 4140 HT, at about 125,000 psi. On a turret lathe, jobs like this one can be done quickly, and CNC may not be justified in terms of setup versus numbers of parts to be run.