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Author Topic: To be or not to be ?  (Read 301 times)

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To be or not to be ?
« on: 20 April 2013, 12:14:03 pm »
Or more precisely 2ba or not 2ba?

2 Dash to bulkhead machine screws  part number 257020 seem to have been superseded by part number SH910241L which is 10unf x 3/4.

Is 10 unf the same as 2ba? I need to clean out the galv from my bulk head so need to know so I can order a tap set, if they are the same thread there is a reasonable price difference between a 2ba set and a 10 unf set.
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Re: To be or not to be ?
« Reply #1 on: 20 April 2013, 05:17:49 pm »
my thread charts are all at work, i will look on monday i think they are the same apart from flank angle of thread but should not make much difference. or try google the thread and look at the sizes to compare. if you pm me an address i can probably  find a 2ba and post it to you if your not in a rush. also try threads europe for taps he is ok on prices. 
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Re: To be or not to be ?
« Reply #2 on: 20 April 2013, 05:29:25 pm »
Thanks Divie, I've kept at it with brick acid so have now clean threads, I still would like to know what if any difference there is between 10 unf and 2ba.
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Re: To be or not to be ?
« Reply #3 on: 20 April 2013, 11:55:42 pm »
The dash screws are 2ba i know as i have aquired some for mine, not sure what the diference is.
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Re: To be or not to be ?
« Reply #4 on: 22 April 2013, 09:04:36 pm »
TPI      Diameter    Pitch      Core      Angle

2BA

31.35   0.185"      0.0319    0.1468    47.5 inc

10 UNF

32      0.190"     0.0342     0.156       60 inc

There are in reality only minor differences between 2ba  and  10 unf  given class of fit and manufacturing tolerances.

2ba will be OK in 10 unf tapping
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Re: To be or not to be ?
« Reply #5 on: 22 April 2013, 09:48:05 pm »
Thanks for the information, I'd net even heard of 10 unf until a few days ago.
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