Missing bench Grinder nut

[Gary Jetz]

Hello to everyone!

Can across a posting about this subject but it's dated back some 10 yrs ago. I have an older bench grinder that is missing the right hand threaded nut for securing the stone.
The threads a 1/2-12 tpi. Where the heck can a guy find one of these nuts? Been searching the internet for quite awhile with no success.

[Rick Whitehead]

What brand is the grinder, and what type threads does it have? Are the threads Acme, square, or V-threads?
All that information would help, as well as pictures of the threads.
1/2-12 thread used to be a standard thread before it was superseded by the present 1/2-13. I have a 1/2 -12 tap, made by the S.W.Card Co.
Rick

[Mikail Khan]

I think i saw them available on amazon. They have left hand as well.

MK

[Bill Dufour]

1/2-12 BSW seems to be common. could it be 55 degree Whitworth threads? Chrysler cars used to use left hand lug nuts on one side of the car. They are a common grinder size maybe 1/2 -13. no idea on thread form.
Bil lD

[Donald G. Burns]

I think i saw them available on amazon. They have left hand as well.

MK


Costly, but available on Amazon: https://www.amazon.com/12-BSW-thread-electroplated-fastener/dp/B07BC9Z1VV

[Lisa Starr]

Some older Rockwell Bench Grinders did in fact use 1/2"-12 Nuts. Some other old Rockwell tools also used the "bastard" 1/2"-12 thread, probably just to force purchase of their repair parts. IFAIK, they parts haven't been available for quite some time.

[Mikail Khan]

Cheaper here

https://www.amazon.com/uxcell-Thread-Stainless-Fastener-Silver/dp/B077GLY9CQ/ref=mp_s_a_1_6?dchild=1&keywords=1%2F2-12+nut&qid=1593540664&sprefix=1%2F2-12&sr=8-6

[Bill Dufour]

FYI: 1/2-13 is about the biggest size you can thread with just a regular homeowner hand tap handle. Bigger then that you have to get a much bigger tap handle that the big box stores do not carry. You will have to use lots of tapping fluid and back up often as you go.
Bil lD

[Scott T Smith]

1/2" 12 tpi is British Whitworth thread (BSW). They are a buck fifteen at this web site.

https://britishfasteners.com/index.php/nuts/steel-nuts/steel-bsw-nuts/bsw-1-2-12-nut-2554.html

[Ryan Yeaglin]

. Some other old Rockwell tools also used the "bastard" 1/2"-20 thread.

1/2"-20TPI is National fine, nothing crazy about it. Maybe they wanted more holding power than coarse threads, at work some of the fans we install for one customer use 1/2-20 Nylock jams, now those are "special".