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Posted: 7/18/2014 6:57:23 PM EDT
Replacing my receiver on my ar 20 inch rifle
what is the the amount barrel torque???? 
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Posted: 7/18/2014 7:31:57 PM EDT
[#1]
It is supposed to be 30 lb-ft for about three tightenings to seat the threads.
Then, final assembly is 35 lb-ft. But it really is where the hole for the gas tube lines up perfectly with one of the scollop's on the nut. That will very seldom turn out to be 35 lb-ft. |
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Posted: 7/18/2014 7:45:21 PM EDT
[#2]
30-80.
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Posted: 7/18/2014 11:00:12 PM EDT
[#3]
Quote HistoryQuoted:
30-80. This^ . Use lube to prevent galling, tighten, loosen 3 times, tighten to a good hole for the gas tube in the range. 3 grunts usually does it for me.. |
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Posted: 7/19/2014 5:27:06 PM EDT
[#4]
Thanks for the feedback
What should I use for lube 
Do you use your grunts or a torque wrench 
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Posted: 7/19/2014 6:31:28 PM EDT
[#5]
Use a moly based anti seize or grease such as Aeroshell 33. Do not use a graphite based product.
Bring to 40 ft/lbs dry 3 times, this will burnish the threads so you get an accurate torque value. Remove the nut, clean and dry the threads on the receiver and nut. Apply anti seize and torque to 40 ft/lbs. Tighten further to align castle nut for the gas tube but do not exceed 80 ft/lbs. Never back off the nut to align the gas tube. If it will not line up without exceeding 80 ft/lbs try a different barrel nut. Use a torque wrench, don't forget to calculate for the offset of the barrel nut wrench. |
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Posted: 7/20/2014 9:50:31 AM EDT
[#6]
Quote HistoryQuoted:
Use a moly based anti seize or grease such as Aeroshell 33. Do not use a graphite based product. Bring to 40 ft/lbs dry 3 times, this will burnish the threads so you get an accurate torque value. Remove the nut, clean and dry the threads on the receiver and nut. Apply anti seize and torque to 40 ft/lbs. Tighten further to align castle nut for the gas tube but do not exceed 80 ft/lbs. Never back off the nut to align the gas tube. If it will not line up without exceeding 80 ft/lbs try a different barrel nut. Use a torque wrench, don't forget to calculate for the offset of the barrel nut wrench. Could I use bearing grease or any kind of grease from auto part store
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Posted: 7/20/2014 11:25:06 PM EDT
[#7]
Quote HistoryQuoted:
Could I use bearing grease or any kind of grease from auto part store Quote HistoryQuoted:
Quoted:
Use a moly based anti seize or grease such as Aeroshell 33. Do not use a graphite based product. Bring to 40 ft/lbs dry 3 times, this will burnish the threads so you get an accurate torque value. Remove the nut, clean and dry the threads on the receiver and nut. Apply anti seize and torque to 40 ft/lbs. Tighten further to align castle nut for the gas tube but do not exceed 80 ft/lbs. Never back off the nut to align the gas tube. If it will not line up without exceeding 80 ft/lbs try a different barrel nut. Use a torque wrench, don't forget to calculate for the offset of the barrel nut wrench. Could I use bearing grease or any kind of grease from auto part store I do, none of my rifles have blown up, disintegrated or fallen apart yet. 
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Posted: 7/22/2014 7:41:06 PM EDT
[#8]
Quote HistoryQuoted:
I do, none of my rifles have blown up, disintegrated or fallen apart yet.
Quote HistoryQuoted:
Quoted:
Quoted:
Use a moly based anti seize or grease such as Aeroshell 33. Do not use a graphite based product. Bring to 40 ft/lbs dry 3 times, this will burnish the threads so you get an accurate torque value. Remove the nut, clean and dry the threads on the receiver and nut. Apply anti seize and torque to 40 ft/lbs. Tighten further to align castle nut for the gas tube but do not exceed 80 ft/lbs. Never back off the nut to align the gas tube. If it will not line up without exceeding 80 ft/lbs try a different barrel nut. Use a torque wrench, don't forget to calculate for the offset of the barrel nut wrench. Could I use bearing grease or any kind of grease from auto part store I do, none of my rifles have blown up, disintegrated or fallen apart yet.
They won't kaboom but if it is a graphite based product you are introducing an element that can accelerate corrosion between the nut and receiver threads. The graphite can cause galvanic corrosion. |
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Posted: 7/23/2014 2:52:04 PM EDT
[#9]
Quote HistoryQuoted:
They won't kaboom but if it is a graphite based product you are introducing an element that can accelerate corrosion between the nut and receiver threads. The graphite can cause galvanic corrosion. Quote HistoryQuoted:
Quoted:
Quoted:
Quoted:
Use a moly based anti seize or grease such as Aeroshell 33. Do not use a graphite based product. Bring to 40 ft/lbs dry 3 times, this will burnish the threads so you get an accurate torque value. Remove the nut, clean and dry the threads on the receiver and nut. Apply anti seize and torque to 40 ft/lbs. Tighten further to align castle nut for the gas tube but do not exceed 80 ft/lbs. Never back off the nut to align the gas tube. If it will not line up without exceeding 80 ft/lbs try a different barrel nut. Use a torque wrench, don't forget to calculate for the offset of the barrel nut wrench. Could I use bearing grease or any kind of grease from auto part store I do, none of my rifles have blown up, disintegrated or fallen apart yet.
They won't kaboom but if it is a graphite based product you are introducing an element that can accelerate corrosion between the nut and receiver threads. The graphite can cause galvanic corrosion. Good point |
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Posted: 7/23/2014 6:22:58 PM EDT
[#10]
Quote HistoryQuoted:
They won't kaboom but if it is a graphite based product you are introducing an element that can accelerate corrosion between the nut and receiver threads. The graphite can cause galvanic corrosion. Quote HistoryQuoted:
Quoted:
Quoted:
Quoted:
Use a moly based anti seize or grease such as Aeroshell 33. Do not use a graphite based product. Bring to 40 ft/lbs dry 3 times, this will burnish the threads so you get an accurate torque value. Remove the nut, clean and dry the threads on the receiver and nut. Apply anti seize and torque to 40 ft/lbs. Tighten further to align castle nut for the gas tube but do not exceed 80 ft/lbs. Never back off the nut to align the gas tube. If it will not line up without exceeding 80 ft/lbs try a different barrel nut. Use a torque wrench, don't forget to calculate for the offset of the barrel nut wrench. Could I use bearing grease or any kind of grease from auto part store I do, none of my rifles have blown up, disintegrated or fallen apart yet.
They won't kaboom but if it is a graphite based product you are introducing an element that can accelerate corrosion between the nut and receiver threads. The graphite can cause galvanic corrosion. I don' use Graphite based grease, just standard axle grease. |
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