Sphur ISMS

[Flywheel]

Good evening Shooters,


I am putting a feeler out, has anyone had any issues with Spuhr screws backing out after mounting and torqueing? I re-centered my scope recently and thought I felt one or two slightly loose. Maybe it was my imagination, just thought I would get some other user experience. Running a 6.5CM in a pretty heavy PRS style setup, so not a lot of recoil there to move it about. I appreciate any Input, stay safe out there.

Edit: Referring to the screws for the scope tube, not the mount to the pic rail at the mount base.

 

[_Windrider_]

Good evening Shooters,


I am putting a feeler out, has anyone had any issues with Spuhr screws backing out after mounting and torqueing? I re-centered my scope recently and thought I felt one or two slightly loose. Maybe it was my imagination, just thought I would get some other user experience. Running a 6.5CM in a pretty heavy PRS style setup, so not a lot of recoil there to move it about. I appreciate any Input, stay safe out there.

Edit: Referring to the screws for the scope tube, not the mount to the pic rail at the mount base.

Never

 

[Flywheel]

10-4, I'll rock on and double check myself for error then lol.

 

[Gee Kay]

i run two of them, no loctite and no issues

 

[Zatchmo]

What are you torquing them to? The spec is surprisingly high at 25 in-lbs. I do know some scope manufacturers say less, so definitely check all of your manuals before cranking down on them. I'll second or third the never had one back loose, though.

 

[Flywheel]

Running them at 18 across the board at the moment. Middle of the road really for the 15-25 the mount spec's for.

 

[Gee Kay]

cross bolts for me are what sphur recommend, rings are what scope manufacturer recommend. PMII5-25 in one and 5-25 strike eagle in the other.

 

[Flywheel]

cross bolts for me are what sphur recommend, rings are what scope manufacturer recommend. PMII5-25 in one and 5-25 strike eagle in the other.

Forgive me, I didn't understand the context of your statement. Maybe it just went over my head .

 

[Gee Kay]

 

[Gee Kay]

Forgive me, I didn't understand the context of your statement. Maybe it just went over my head .

above you were talking about torque values, i simply stated what torque values i use on my sphur mounts, pretty much what sphur and the scope manufacturers recommend.

 

[Flywheel]

Got you brother. I run a ZCO, so it says go by ring manufacturer specs, specs are 15-25 on tube and 45 on the base. I split the difference of the listed values on the tube and run them at 18.

 

[Gee Kay]

sounds fair

 

[seansmd]

I saw your update to the op, I also have a zco, and have the fixit stix kit with either 15 or 25 as options I think I went 25. Trusting zco and spuhr.

You didn't say but assume you followed the pattern for tightening?

 

[Flywheel]

I saw your update to the op, I also have a zco, and have the fixit stix kit with either 15 or 25 as options I think I went 25. Trusting zco and spuhr.

You didn't say but assume you followed the pattern for tightening?

I did sir, just had the heebie-jeebies twisting off to max torque value on my scope, maybe that's just me. I figure after the round table here, I'll go up to 20 in-lbs and double check after a few range sessions.

 

[LV Precision]

I'm also at 18 in/lbs for the scope body, 45 in/lbs for the scope base on my SP-4001, no loctite. Haven't had the slightest movement with my Razor 4.5-27.

 

[kimbergoldmatch]

I switched to a Spuhr ST-3701 at 432 rounds (45 in-lb base and 18 in-lb rings, no Loctite) with a Vortex AMG EBR-7.

At 742 rounds I switched to an Vortex AMG EBR-7B and have since shot an additional 352 rounds and nothing ever came loose.