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Tool Talk Discussion Forum

Re: drill bit - thread tap

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George S. in the real NY

07-26-2014 05:41:34

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You sure you got 28 threads per inch?? Many grease fittings are 1/8-27 pipe thread. Check this chart for info: . Shows R or S drill bit size for the pipe thread. Here is link again:

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07-26-2014 06:22:43

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 Re: drill bit - thread tap in reply to George S. in the real NY, 07-26-2014 05:41:34  
There were the 1/4" 28 thread fittings ( fitting size is stated on box )used on a lot of machinery and it is the same size as a 1/4" fine thread bolt. then the more popular 1/8" pipe thread grease fittings. The New Idea No. 4 rake takes 20 of the small size grease fittings and 13 of the larger size pipe thread fittings. Then there were the 5/16" drive in fittings used on some machinery and then the 1/4" pipe thread fittings that were used on a Massey disk I just redid.

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George S. in the real NY

07-26-2014 06:42:46

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 Re: drill bit - thread tap in reply to Leroy, 07-26-2014 06:22:43  
Yup, that's why the question--a lot of mechanics are not aware that there are pipe and regular thread fittings available. Thing is the 1/8 pipe and 1/4 sae are so close in size. long ago I was told that the 1/4 sae tap would work for th 1/8 pipe. Nice to know NI liked the sae threaded fittings. Good you were on top of that one...

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