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  #1  
Old 5th December 2019
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Default question for our machinists

i have a thread per inch gauge for nc/nf threads but I don't have a metric thread pitch gauge.is 12 tpi the same or similar to metric 2.0 thread pitch?
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  #2  
Old 5th December 2019
Iron Mike Iron Mike is offline
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**They are not the same**
You asked if they are similar?? Metric 2.0 is the distance in mm from crest to crest of one thread. Standard threads are TPI. 25.4 mm in 1 inch divided by 2=12.2. Similar if you squint real hard.
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  #3  
Old 5th December 2019
decman decman is offline
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It's close but not the same

https://www.fastenermart.com/underst...fasteners.html
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  #4  
Old 5th December 2019
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Default

thanks guys the threads i'm dealing with I believe to be metric because the seal kit dimensions are listed in m.m. but my 12 tpi gauge fits very well.
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  #5  
Old 6th December 2019
Iron Mike Iron Mike is offline
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Bruce pointed out my math error in my post, clearly 25.4 divided by 2 is 12.7.

Honestly I knew that, dont know what happened there......

thanks Bruce, when doing machine work, mistakes like that lead to a heavy scrap bin!
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  #6  
Old 6th December 2019
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Measure twice, cut once....
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  #7  
Old 6th December 2019
JonesL JonesL is offline
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Standard US threads, whether NC or NF are 60 deg. Sometimes w/ special applications 50 deg. Pretty sure that metric is a different angle in addition to the pitch dimension.
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Old 6th December 2019
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Use a bigger hammer - it'll fit.
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Old 6th December 2019
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Quote:
Originally Posted by JonesL View Post
Standard US threads, whether NC or NF are 60 deg. Sometimes w/ special applications 50 deg. Pretty sure that metric is a different angle in addition to the pitch dimension.
Metro threads are also 60 degree. The old English threads are 55 degree.
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  #10  
Old 6th December 2019
Iron Mike Iron Mike is offline
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Quote:
Originally Posted by ryder rick View Post
Measure twice, cut once....
i dont know what happened on that one.....but man, I cut it twice now and its still too short.
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