Rifle Scopes How tight to screw scope rings

twwilson25

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Jan 19, 2008
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Fort Worth, TX
Guys,

I have mounted my scope several times before but have never properly tightened the screws to the proper tension. I noticed the last time I shot, the scope had moved, forward. Can someone tell me how many lbs or how tight to screw the scrope rings down so that I don't crush the tube either?

Thanks,
 
Re: How tight to screw scope rings

99% of rings only need 15-20<span style="font-weight: bold"> INCH</span> pounds. I put inch in bold because you wouldn't believe how many people get out the old foot pound torque wrench, because they mis-read. Glen Seekins can tell you a very interesting story about that, as can I ,but Glen's is better.











Scott
 
Re: How tight to screw scope rings

20 inch pounds in a gradual and even manner (think in terms of putting lug nuts on a wheel) and using a thread locker like Loctite Blue.

I'm also a bit particular about the temperature of all parts involved... I make sure the receiver, mount, rings and scope are all the same temperature. Sure, they're dissimilar metals and have different expansion and contraction rates, but it's better than slapping a cold scope on warm rings.
 
Re: How tight to screw scope rings

I'm pretty sure my torque wrench is in Inch lbs. I just need to adjust to the correct setting. I wouldn't have noticed the scope movement but I painted my scope after I set it in the rings. I could see 1/4" of black unpainted scope after several rounds.

Thanks Guys!
 
Re: How tight to screw scope rings

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Scott_at_Vortex</div><div class="ubbcode-body">99% of rings only need 15-20<span style="font-weight: bold"> INCH</span> pounds. I put inch in bold because you wouldn't believe how many people get out the old foot pound torque wrench, because they mis-read. Glen Seekins can tell you a very interesting story about that, as can I ,but Glen's is better.

Scott</div></div>


Do tell... I've got one too, but not about scope rings. It's about a 1/4-28 that I was told 110. Inch pounds that is, not foot lbs. like I used (I did say beforehand that was awfully high). Fortunately, the standard in aviation was that we used washers under both the bolt head and the nut and the bolt just stripped. There was no damage to the engine case halves.....

Anyhow, I set my torque wrench (a fine Snap-On specimen that tests right every time) to about 20 inch pounds. I also like to use loctite as that gives a 'wet' torque value instead of dry torque and therefore truer.

If you do not have a torque wrench you can install these safely by evenly bringing them down to firmly stopping. Then take either 15-30 degrees more travel. To get that picture the hands on a clock-face. Each number is 30 degrees. Do not go more than that. If you do feel like they won't hold, back them off and resettle the cap and bring the screws down again. This is where loctite really pays off as well as holding them in place. With wet torque you don't get near as much drag and the feeling you need to stop early. Meaning the loctite actually works like a lubricant when tightening the screws.


With that said, I am now going to install my new Nightforce 12-42x50 on my 7mm-08
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Re: How tight to screw scope rings

Another factor is quality of the rings. If they are crap for rings... you get my point. Buy good qaulity rings, and you won't have any problems. I use Near, and suggested torque value is 20 to 25 inch-lbs. I torque to 22 (or 23 for large caliber), and never have a problem with scope movement, or ring marks.

Leupold (Mk-4) suggested torque value is 28 inch-lbs, and that is too much and will cause ring marks, especially on scopes that have enamel paint finishes (i.e. Kahles).

I bought one used high-end scope once, and the ring marks were down to the metel, and think it was a combination of poor quality rings, and over-torque on the ring screws by the previous owner.