Tap for the M1 garand gas tube

Dave45-70

August 31, 2011 11:02

I picked up a couple M1 gas cylinders that had buggered up starting threads from some one cross threading the cylinder lock(plug) The spec's say I need a 9/16"x32 tpi. Any one know where I can purchase a tap? I contacted the CMP but they don't carry them for sale.OR would it be cheaper just to toss the parts out? Thanks for any advice.

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  nmyers

  August 31, 2011 11:27

  I'd take photos of the gas cylinders, being sure to show the damage to the threads, & list them on GB. There are folks out there who will buy just about anything.
  
  Neal

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  bambambam

  August 31, 2011 11:31

  That's a special order tap size.
  
  9/16" taps come in the standard 9/16"-12 for coarse and 9/16"-18 for fine thread.
  
  I would bet because of the size and special order you are taking alot of money. About $90.00!!

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  dcs shooters

  August 31, 2011 11:46

  You can try Newman Tools Inc. at 800-465-1384 for taps.

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  perry shooter

  August 31, 2011 15:04

  also try MSC they are a supply house for industrial customers

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  mark christian

  August 31, 2011 15:47

  Ordnance specs on the threads are 9/16-32 NS 3B Modified. I am not a machinist but I do know that every one of those numbers and letters means something very specific and anything other than that particular thread spec will result in failure.

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  ogree

  August 31, 2011 22:41

  http://www.victornet.com/subdepartments/Special-Pitch-Taps-17/32-to-1-1/8-inch/1270.html

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  countryfarmer

  September 01, 2011 17:20

  http://www.nicolausassociates.com/PDF/ChasingThreads.pdf
  
  Some good info in this article reguarding the gas cylinder threads.

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