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Gas piston nut gauge |
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oldgeorgian
Recruit Joined: Jan 16 2019 Location: Dacula, GA Status: Offline Points: 12 |
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Posted: Mar 23 2019 at 9:02pm |
Took the gas piston out of my Rock-Ola to clean it as it had never been done before and when I went to put it back in, it would not thread right. Looked at the opening on the rifle and see that there is a small bit of thread smushing......clearly need to very carefully retap the thread rather than try to force the piston nut back in. Does anyone know the thread diameter and pitch?
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jackp1028
Hard Corps Joined: Jan 01 2016 Location: Cloudcroft, NM Status: Offline Points: 1273 |
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According to the Department of the Army Ordnance drawing #6147663 it's "1/2-32 NS-3". However, this may be an obsolete thread standard. The modern equivalent is a .500"-32 plug tap.
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JackP
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W5USMC
Moderator Group Joined: Apr 29 2017 Location: Missouri Status: Offline Points: 2949 |
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Kuhnhausen's shop manual also says .500" (1/2")-32 plug tap.
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Wayne
USMC Retired NRA Life Member |
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oldgeorgian
Recruit Joined: Jan 16 2019 Location: Dacula, GA Status: Offline Points: 12 |
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Thanks Jack. Much appreciated.
Appreciate the quick and accurate info.
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Donnie
On Point Joined: May 31 2018 Location: Newburgh, IN Status: Offline Points: 335 |
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I am learning. There are so many very good reference books out there that collectors should own. But, I have found that if you want to work on your carbine, there is one that is a must own; Jerry Kuhnhausen's shop manual.
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oldgeorgian
Recruit Joined: Jan 16 2019 Location: Dacula, GA Status: Offline Points: 12 |
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Was not aware of that book. Found one on eBay and ordered it. Much thanks for the info. Can't wait to get it.
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