rustyzman
Well-known member
I'm late to the party on this one. One of the machine shops I worked at, we used to machine down 316ss 3/8 bolts and make the hex 7/16" rather than the original 9/16. They were then assembled inside a close fitting cup washer at our customer where they were fabricating the rest of the cabinets.All good questions and I use the term 'new' jokingly since you obviously have a vintage tool. The 'C' version must be newer than 1954 from what I can gather. I could be mistaken altogether of course. It seems like the 'C' variant is quite a bit different but they didn't want to give it a different number I guess.
If we back up to the 30's the 'B' version replaces the 216.
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I worked quite a while on a faster, more economical method of machining those and we finally did come up with a good supplier of bolts for raw material and a better machining process/tumbling secondary process to remove all the hand work. Man I made thousands and thousands of those bolts. In case you are wondering, the customer did not allow us to machine the full bolt from barstock, we tried to do that for them, but they insisted on a modified factory made bolt.
I still have some of both methods I think...




















