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Screw Thread

Nhoj · 8 · 880
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us Offline Nhoj

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Screw Thread
on: January 18, 2013, 02:12:13 AM
I have never read a screw thread note before, can someone tell me what each of the numbered parts are?

us Offline powernoodle

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Re: Screw Thread
Reply #1 on: January 19, 2013, 05:04:02 PM
Pretty sure that 1/2 is diameter in inches. 

8 is the bolt size, and UNC is coarse thread which equates to 32 threads per inch on a #8 bolt; http://www.engineershandbook.com/Tables/uncunfthreadsperinch.htm

My brain will explode if I try to figure out what 3alh means.  The closest I could find is that ALH is a Volkswagen diesel engine code.  But thats probably not what you are looking at.

I have to go soak my head in a bucket of ice now.

Good luck.
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us Offline redbaron

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Re: Screw Thread
Reply #2 on: January 19, 2013, 05:27:08 PM
Quote from: powernoodle on January 19, 2013, 05:04:02 PM
Pretty sure that 1/2 is diameter in inches. 

close, it's the diameter before tapping the thread

ca Offline wndrstrck

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Re: Screw Thread
Reply #3 on: January 19, 2013, 05:40:06 PM
3A refers to outside threads(class 3 used for closer tolerances) and Left Hand threads.
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ca Offline Landrew

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Re: Screw Thread
Reply #4 on: January 19, 2013, 06:00:02 PM
Is this a thread about screws, screw threads, thread-screws, or is someone saying "screw this thread?" :ahhh
« Last Edit: January 19, 2013, 06:38:27 PM by Landrew »

gb Offline AimlessWanderer

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Re: Screw Thread
Reply #5 on: January 19, 2013, 06:34:42 PM
I'm not that familiar with UNC as generally I come across BSW & ISO threads. I would have said:

1/2" Diameter, Unified Course thread form at 8 threads per inch, Class 3A (defines tolerances) Left Hand ... however 8TPI doesn't sound right for 1/2" diameter  :think: 1" diameter, yes maybe - I'd have expected more like 18 TPI at 1/2" ... so maybe I'm missing something


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us Offline Nhoj

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Screw Thread
Reply #6 on: January 19, 2013, 07:01:14 PM
Thanks you guys!

au Offline PTRSAK

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Re: Screw Thread
Reply #7 on: January 19, 2013, 09:47:41 PM
1/2 UNC is 13TPI,  1" uses 8TPI

1/2-8  would look more like an auger than a thread :)
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