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Torque Recomendations

 
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  #1  
Old 04-11-2008, 10:08 PM
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Location: Texas
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Torque Recomendations

The question has been asked on several occasions
what the torque for bedding screws and scope bases
should be so I though this might be helpfull.

"NOTE" These are based on full engagement of threads.

Wood, Fiberglass or Synthetic stock without bedding pillars-
40 inch-lbs.

Wood, Fiberglass or Synthetic stock with bedding pillars -
up to 65 inch-lbs.

Hard-use service-type rifles in synthetic with pillars-
up to 65 inch-lbs.

Law enforcement & military rifles are 65 inch-lbs on each
of the guard screws.

On rifles with three guard screws the middle screw should
be only slightly tightened.

Scope base screws 30 inch-lbs "MAX"

Windage screws 30-40 inch-lbs "MAX"

Scope ring screws (Aluminum Rings) 10-15 inch-lbs "MAX"

Scope ring screws (Steel Rings) 15-20 inch-lbs "MAX"

Note' If scope base and ring Screws have less than 5 threads
of engagement they should be replaced with longer ones.

Barrel to receiver Torque 35 ft/lbs minimum to 95 ft/lbs Max.

If an anti seize compound is used instead of a light oil use 65
ft/lbs max to prevent over torquing.

I hope this will help
J E CUSTOM
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  #2  
Old 04-11-2008, 10:22 PM
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Location: Central, KY
Posts: 336
Is there any way to guess in the bedding screw torque? I mean screw snug then 1/2 turn or something like that?
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  #3  
Old 04-11-2008, 11:22 PM
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Location: Texas
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Scott

I allways change out the screws if they are not allen or torx
head screws to get proper torque values on the screws.

With ether the torx or allen wrenches ( L shaped) you can only
apply about 20 to 30 inch/lbs to 1/4-28 bedding screws. and with
6/40 to 8/32 screws about 15 to 20 inch/lbs with out bending
the wrench.

Inch/pound torque wrenches are a must if you take your rifle
out of the stock for cleaning or other reasons,if you want it
to return to or near the same zero.

Brownells sells torque wrenches fairly cheep.

J E CUSTOM
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  #4  
Old 04-12-2008, 08:07 AM
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Location: Ontario, Canada
Posts: 182
Good info Scott.

Maybe this should be made a sticky.
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  #5  
Old 04-13-2008, 03:13 PM
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Location: Sonoma County, CA
Posts: 824
J E Custom, thanks for taking the time to post this, it's good info. Can you tell me what procedure for tightening the action screws you use. Which screw is torqued first? etc.
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  #6  
Old 04-13-2008, 09:50 PM
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I start by making up the action screws by hand ( Snug ) front
screw first then the rear next.

Then with the torque wrench I start the front at 20 inch/lbs and then
the rear.

If it is the first time fired after bedding I go up in 10 inch/lb increments to
35 to 40 inch/lbs and let it set for several days before shooting.

At the range I will fire a 5 shot group and let cool and clean, then raise
the torque in five inch pound increments and shoot 5 more rounds and continue
the procedure (Shoot,clean and torque) untill there is no improvement
in the group size.

This allows the bedding to be seated in properly, but no more than nessary.

Once the optimum torque is reached the in/lbs goes in the load data for
that rifle for future reference.

On rifles that have heavy recoil I have had to work all the way up to 65 inch/lbs.

"NOTE" This procedure will work on all stocks but dont exceed the max recomended
torque for the type of stock and bedding system your using. Also I like to wait 4 or 5
days after bedding to start this process even though the bedding manufacture may
say 24 hours is enough time.

This is the way I do it and even though it may seem like overkill it works well for me
and is very consistent (repeatable) each time the barreled action is removed from
the stock.

Good Luck and I hope this helps.
J E CUSTOM
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  #7  
Old 07-24-2011, 04:23 PM
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Re: Torque Recomendations

bump................
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We are very close to this point now.
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