Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Hunting > Long Range Hunting & Shooting

Long Range Hunting & Shooting Nightforce Optics


Reply

Torque Specifications

 
LinkBack Thread Tools Display Modes
  #1  
Old 10-03-2012, 12:09 PM
Junior Member
 
Join Date: Aug 2009
Posts: 16
Torque Specifications

I am looking for a range of torque specifications I can experiment with for actions that are bedded on aluminum pillars. Any suggestions? Two Winchesters Model 70's, one in 300 WSM and one in 270 WSM. Also, one Remington 700 in 204 Ruger. Thanks.
Reply With Quote
  #2  
Old 10-04-2012, 02:20 PM
Silver Member
 
Join Date: Feb 2010
Posts: 353
Re: Torque Specifications

Don't know about the Winchesters, but the Remington is based on the type of stock. Wooden stocks are 35 inch lbs, fiberglass are 45. Remington has it posted on the website, please check or just call them. My sendero has a HS Precision which is 65 inch lbs.
Reply With Quote
  #3  
Old 10-04-2012, 03:19 PM
Platinum Member
 
Join Date: Jan 2008
Location: SOCIALIST CONTROLLED TERRITORY OF NEW YORK
Posts: 4,388
Re: Torque Specifications

I use 65 inch pounds on my HS precision but its really just a bench mark and they are not pillars. I would start some where around 40 and go up and down just to see what it does to your groups.
__________________
"People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf"
If you want to shoot Bergers start here!
http://www.longrangehunting.com/arti...accuracy-1.php
Reply With Quote
  #4  
Old 10-05-2012, 11:38 AM
Platinum Member
 
Join Date: Feb 2010
Location: Gillette, WY
Posts: 2,393
Re: Torque Specifications

Quote:
Originally Posted by ICANHITHIMMAN View Post
I use 65 inch pounds on my HS precision but its really just a bench mark and they are not pillars. I would start some where around 40 and go up and down just to see what it does to your groups.

^^^ This is sound advice. From my lowly .204 to my 338RUM. From unbedded wood stocks to a solid aluminum chassis, NONE of my action screws exceed 40in/lb. IIRC with a 1/4in fastener the clamping force is somewhere in the 1200lb range. An ex-USMC armorer has reported seeing eventua stud yield at 65in/lb leading to loss of accuracy. Now, That is definitely an extreme case, but from what little i've read, 65 may be a little too high for that small of a fastener.


YMMV
__________________
"I, however, view ethics as an individual decision. My ethics are mine - and I won't explain or justify them to anyone else. I seek nobody's approval, just that of my own conscience. "

Reply With Quote
  #5  
Old 10-05-2012, 04:51 PM
Silver Member
 
Join Date: May 2011
Location: Colorado
Posts: 307
Re: Torque Specifications

Quote:
Originally Posted by Outlaw6.0 View Post
^^^ IIRC with a 1/4in fastener the clamping force is somewhere in the 1200lb range.
YMMV
You guys can estimate fastener preload (clamping force from the action screws) very easily with the following equation. (assumes lightly lubricated threads)

Preload Force = Torque / (0.21 * bolt diameter)

Where Torque is in inch*lbf, 0.21 is the unitless coefficient of friction, and bolt diameter is in inches. You can re-arrange the equation and input your desired Preload Force and calculate your necessary Torque if you prefer it that way too

So for a 1/4-28 action bolt (0.25 inches diameter) and 65 in*lbf Torque, the preload force = 1238 lbf.

Outlaw 6.0 is right on... And I agree that is a high preload. 45 in*lb torque still gives 857 lbf of preload for each action bolt.

And remember these are estimates... lots of variables can change the actual preload force, but gives you a good starting point.
Reply With Quote
  #6  
Old 10-05-2012, 08:07 PM
Platinum Member
 
Join Date: Jul 2004
Location: Texas
Posts: 5,190
Re: Torque Specifications

Do a search on "torque Recommendations" and you will find all of the recomended Torques.

J E CUSTOM
__________________
"PRESS ON"
Reply With Quote
  #7  
Old 10-06-2012, 04:28 PM
Junior Member
 
Join Date: Aug 2009
Posts: 16
Re: Torque Specifications

Thanks guys, I really appreciate it!
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: Torque Specifications
Thread Thread Starter Forum Replies Last Post
Torque? xdeano Long Range Scopes and Other Optics 1 03-30-2010 08:36 AM
SAMMI chamber specifications 30-06 sprg buzzard Reloading 1 02-13-2007 09:19 AM
Torque Kent The Basics, Starting Out 6 07-28-2006 12:20 AM
How much torque? haeffkr Rifles, Bullets, Barrels and Ballistics 0 11-02-2005 01:48 PM
Tourque Specifications Big D Long Range Scopes and Other Optics 3 11-05-2002 09:32 PM

Current Poll
Do you wear hearing protection while hunting?

All times are GMT -5. The time now is 09:28 PM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC