Part Sourcing

[tbell57]

Just finishing up a rebuild of Kuhlmann SU 2 single lip cutter grinder. The draw nut collet is missing.
What I know about the part is M20 x 2 buttress ID thread, P# 573.116 or FM845e. Found one source but they want near $200. I may need to make it, but need the buttress threading insert or bar specs. Any suggestions are appreciated.

Regards

Tony

 

[aliva]

Check Sandvik, Kennametal. also

AMERICAN BUTTRESS THREAD INSERTS

Using American Buttress thread inserts, strong forces can be transmitted in one direction. It is for both strength (V- thread) and low friction (square thread).

exacttooling.com

 

[Flyinfool]

Here is a bit of info on the Coarse Buttress thread in the attached PDF.

Some info for the Fine Buttress Thread.

https://www.gewinde-normen.de/en/images/buttress.gif