I heard a guy on TOS that used to work at Trijicon say 30 or 31 inch Lbs. but then I sent an e-mail to Trijicon and after a three month wait they replied there is no torque spec.
So I don’t know.
Does anyone know?
Edit: Not the thumb nuts but the flat head screws that hold the mount to the scope.
I would go with what the company said ,best thing would be to tighten it down ,shoot a few hundred rounds check to see if it loosen up if not GTG if it does Tighten it up More repeat
Thanks.
The screws that are used on the ACOG have red Nylok on them, so being the one time use screws that they are I will try and get some new ones from Trijicon first.
Or just put a drop of locktight on them, and re use.
I would use scope rings and steel screws as a refrence point. I would say no more than 30" pounds as most of my scope rings say no more than 20" pounds. But the screws on the rings are much smaller than that of the acog mounting screws. Some ble locktight will not hurt either.
I have never had issue with the mount screws being loose on any of the ACOGs I have owned. The new Aimpoints that another story.
I was under the impression that over torquing rings on a tube was because the tube could constrict in one place causing the adjustments to not work properly or erratically while zeroing. The ACOG’s mount is no where near the tube so it shouldn’t be a problem.
The only problem with useing Loctite is I would have to remove the Nylok, which may or may not be a fun time.
I’ve never seen a spec on torque, but 30in-lb doesn’t seem unreasonable.
For reference, the torque spec used when slapping an SSDS into its rings is 15in-lb applied to the little screws that hold the rings halves together.
Starting with new screws isn’t a bad idea, if the ones you have are the aluminum ones I’m used to seeing, that use a flathead screwdriver to apply. Ping LaRue, and they might take kindly to a request to send steel screws that use an Allen key to tighten.
Blue Loctite is still sufficient.
JSan,
Yes, I have the flat head screws, though these ones are made of steel. I didn’t know LaRue had a hex version.
Thanks.
What optic do you have? We only use Nylok on the Marine SDO and it’s blue. You should have red Loctite and you can just add a little more. We install the mount at 30 in-lbs at the factory.
Are you the guy from TOS that used to work for Trijicon that said the torque spec is 30 in-lbs?
I have a TA31H-G.
Eric at Trijicon told me that the screws have a pre-applied red thread locker which I know as Nylok, the thread locker on AR stock screws. He also said there is no torque spec for the mount screws.
I have also heard from some people that sometimes there is nothing on the screws.
I’m on TOS site as well but I still work here. Eric was mistaken, the torque spec is 30 in-lbs and we use pre-applied Loctite. Nylok and Loctite are two different materials from two different suppliers, your scope has Loctite.
Thank you.
Is it possible to install the screws correctly without a torque screwdriver or should I go buy one?
I would instantly know If I was dealing with Nylok or Loctite If I had removed the screws, I was just going off of what Eric said.
When you say pre-applied Loctite what do you mean by that?
Also, the Loctite is red but what number is printed on the bottle?
If you have a torque screwdriver, use the 30 in-lbs. Even though I have one, I’ve never used a torque wrench to install mounts on my own ACOG’s. Just get them tight with a screwdriver that fits, they will be fine. As for the Loctite, use 271.
Will I need heat to remove these screws?
Thanks for the info.
More than likely, I normally use a soldering iron and hold it against the screw head for a few minutes.
Thats a great idea! BTW my TA13F had zero locktight or nylock, just 2 steel screws.
Check with Trijicon for them, too. I’m getting mixed signals as to who sourced them.
I’ve got e-mails out to both LaRue and Trijicon.
Back from the dead.
Soldering iron worked great, I just held it to each screw for a little over three minutes and they came right out.
I have another question about the Loctite.
Is there any specific reason they chose to use 271 threadlocker out of all the other choices?