On 7/24/2020 10:35 AM, Jon Elson wrote:
wrote:

On Sunday, March 31, 2002 at 9:56:12 AM UTC-8, Jim Schwitters wrote:
I finally got the damaged collet key removed from my B'port C head
spindle
but found it's threaded 1/4 x 32. Anyone know of a source for a setscrew
at least 3/8"long in that thread or a bolt or threaded rod from which I
can make a replacement.

I can always turn one on the lathe but I'd like a good fit and that will
be
difficult without good thread measuring tools. I'd also rather not
rethread the hole, either.
Thanks,
Jim S.

here ya go
https://www.mscdirect.com/browse/tnp...id=ppc-google-
New+-+Machinery+-+PLA_s7VEgyYkn___164110813593_c_S&mkwid=s7VEgyYkn% 7cdc&pcrid=164110813593&rd=k&product_id=53319448&g clid=Cj0KCQjw6uT4BRD5ARIsADwJQ1_1fzE2zQ920pr32s1Ob WXYVzbhflmLMir213MjOkFEvuTMj8J0-
BkaAnJ0EALw_wcB

Wow, I don't think that is right. !/4" standard threads are 20 and 28.

I'm thinking this may be a 6 mm x 0.8 metric screw.

Jon



I just checked. 1/4-32 is a standard for UNEF.

UNF is indeed 28 and UNC is 20 though.

I often forget to check for UNEF threads until confronted by one.