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Posted

I'm trying to find a bolt to fit a thread in piece of equipment.

 

I used my neighbour's tap and die set and found that the one that worked was 12 NC 24.

 

What size of bolt is this??

 

Help?

 

Entropy

Posted

12-24 is a real oddball

 

i've been doing tool and die for almost 15 years, and never heard/seen one...

i had to check the machinery handbook to see if it exists...

 

10-24 is a standard screw, readily available...

 

If you're looking for the 12-24...

 

try brafasco, Fabory, Fastenal, Bolt and Nut Supply...

 

Good Luck

Posted

Hopefully its legible, but heres some info on that, 12-24 NC.........12 is the diameter-24 is the threads per inch, and the NC is a course thread (as opposed to NF which is fine thread)

 

screwthreads006.jpg

 

screwthreads005.jpg

Posted

12-24NC 12 is the bolt, 24 is the thread, nc is is coarse you will need a #16 drill, decimal equivalent ,.1770 probable hole size .1805, 66%of thread. a 3/8 drill will work all bolts can be found at brafasco, fastenal or other similar place :blahblah1:

Posted

You got a tap and die set right in front of you, make it. Its a metric bolt so if you have a SAE bolt thats not threaded all the way and is long enough and right diameter cut the threads off and make your bolt.

Posted (edited)

you may not be able to get it in a hex head bolt but you will be able to get it in a machine screw with a robinson or philips head. skip canadian tire and go to home depot. machine screws are not that strong (gr2) you might want to redrill and tap to 1/4 and use a grade 8 bolt if it's something important

 

bolt_grades.gif

Edited by dwc67

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