ntsog
Frequent Contributor
Posts: 60
ATN Products Owned: Night Vision Optics
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Post by ntsog on Oct 23, 2019 23:51:16 GMT -8
G'day,
I've looked for information about how tight [in inch pounds] to tighten the cross bolts that secure the Sight onto the picatinny rail, but to no avail. I was very conservative in tightening the bolts and paid a price when my previously accurate zero went wandering due to the bolts loosening. General research on the Internet suggests such bolts should be tightened in the 40-60 inch pound range. Does anyone have any advice? Presently the bolts have been tightened to 42.5 inch pounds - plus Loctite. So far, so good.
Jim
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retired
Top Contributor
Posts: 189
ATN Products Owned: Night Vision Optics
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Post by retired on Oct 24, 2019 11:40:05 GMT -8
Good timing. I just got my offset rail mount from Vortex. I assume my mount, rings, and screws are all aluminum as Vortex recommends 20 in lbs for the rail screws and 16 in lbs for the scope rings. Recommended torque is figured by fastener size, threads, and material. I will mount my scope at the recommended torque plus blue Loctite.
Jim
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ntsog
Frequent Contributor
Posts: 60
ATN Products Owned: Night Vision Optics
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Post by ntsog on Oct 24, 2019 20:33:49 GMT -8
Hi Jim, I've just returned from a local gun shop where I had a chat with a bloke mounting a scope for a customer. He basically agreed with the information in this article: precisionrifleblog.com/2013/03/22/rifle-screw-torque-settings-specifications/I have mounted the picatinny rail on my Weihrauch HW 60J with the 4 screws set at 15 inch pounds plus Loctite. As stated I have set the cross bolts at 42.5 inch pounds on my ATN scope. I also found this: store.fixitsticks.com/pages/torque-specsThe torque settings for Vortex are detailed down the page. I was somewhat interested that the recommendations include "Base Clamp Screws: 45-50 in-lbs". Here's hoping my scope stays where I've put it now. Jim
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retired
Top Contributor
Posts: 189
ATN Products Owned: Night Vision Optics
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Post by retired on Oct 25, 2019 6:58:40 GMT -8
Thanks for the links. The base clamp screws are probably steel being attached to a steel receiver and can obtain a much higher torque setting than aluminum screws attached to an aluminum mount without damage to the threads. I hope our discussion has been followed by other ATN owners and we may have prevented someone from damaging their equipment. Thanks for the discussion.
Jim
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Post by anbruneb on Oct 28, 2019 0:23:30 GMT -8
Should add here that one should use screws as long as possible wich also prevents threads from breaking. On my Mars 4 model the screws on the rings was really to short in my opinion. One must remember that aluminum is much more fragile than steel! On top of this, the original rings provided from ATN is really not that good. Poor tolerance on diameter on my rings. The scope was not at all tight when placed in the base-ring.
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Post by ghackworth on Jan 23, 2021 19:59:37 GMT -8
First thing to do: throw the rings that come with the device in the trash they are junk. Buy a good set of rings and torque to manufacturers specifications.
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