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Unmarked bolts: Heat Treat or Cryo-treat

This is a discussion on Unmarked bolts: Heat Treat or Cryo-treat within the Gunsmithing forums, part of the M14 M1A Forum category; I have access to a metallurgy facility that can do heat treat and cryo-treat. I have 3 unmarked bolts- presumably Polytech/Norinco- and one coming. Only ...


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Old March 7th, 2017, 09:36 PM   #1
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Unmarked bolts: Heat Treat or Cryo-treat

I have access to a metallurgy facility that can do heat treat and cryo-treat.

I have 3 unmarked bolts- presumably Polytech/Norinco- and one coming.

Only one checks out lower than 50 HRW on the gauges at the facility.

I can get the bolts re-heat treated, nitrided, or cryogenic dip.

Which would you do ?

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Old March 8th, 2017, 02:43 AM   #2
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None of the above.

I would buy US made bolts and set the Chinese aside to look at.
I think I have a hand full in a drawer in the workshop from conversions done 20 years ago.

Semper Fi
Art

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Old March 8th, 2017, 03:20 AM   #3
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Re-heat treating precision parts rarely works out well enough to be worth it.

Cryogenically treating them will not improve the core hardness, ie the strength.

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Old March 8th, 2017, 06:03 AM   #4
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Once again ,walking talking m14 encyclopedias so thanks to all three of you guys .

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Old March 8th, 2017, 06:23 AM   #5
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it's too close to your face to play games with.
the made in china info should have been enough of an indicator


Last edited by POLACK; March 8th, 2017 at 06:40 AM.
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