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Barrel Thread Size


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#1 kilroyjones

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Posted 05 October 2005 - 08:02 PM

Could someone tell me if the Kahr 27's use the square thread on the chamber end of the barrel? What size is the thread used? Thanks.
Kj
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#2 deerslayer

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Posted 05 October 2005 - 09:53 PM

All thompsons use the same barrel thread size (that is the same square thread as your question). I don't know exactly what it is, but PK should know.
Dan
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#3 Bisley45

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Posted 06 October 2005 - 09:24 AM

Square, just like 03 Springfields and P14 & M1917 Enfields. Think that would be a good use of a Khar or W/H barrel except it be a louse use of an action.

BB
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#4 PATHFINDER

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Posted 06 October 2005 - 04:00 PM

QUOTE (PhilOhio @ Oct 6 2005, 11:24 AM)
Aren't those called "Acme" threads?

You are correct sir.
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#5 kilroyjones

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Posted 06 October 2005 - 04:20 PM

Square threads have a sharp 90 degree edge. Acme threads have a slight 45 degree bevel. Most vises and C-clamps have an Acme thread.

Thanks to everyone who replied. KJ
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#6 amafrank

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Posted 07 October 2005 - 08:49 AM

There is indeed a Square thread as well as Acme, sharp V, truncated V, buttress.....the list goes on.
The thompson is a Square thread and I believe the pitch is 10 per inch. I can't remember the diameter though 7/8" comes to mind.
Acme threads don't have a 45 deg flank but they do have some taper where the square threads have very little.
Frank


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#7 PK.

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Posted 07 October 2005 - 10:01 AM

How did I miss this thread?

Yes, Thompson thread form is what we call square, the major diameter is .848 and 10 pitch is correct.

Acme threads are 29 degrees.

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