Variable Torque Adjustment Screwdriver for Red Dot

Pinecone · Jan 5, 2022

John from MD said:
https://www.midwayusa.com/product/1021740444?pid=385166

It is made by Vortex and it slips over when you hit the torque setting. I have checked it with a laboratory calibrated torque wrench and it is right on. It cost a little more but I feel it is better quality than the FAT wrench.

This looks like the same item but with a Lyman branding.

https://www.amazon.com/Lyman-Pro-Dr...ue+wrench+mounting+kit&qid=1641403664&sr=8-10

John from MD · Jan 5, 2022

Check this one out. To low a range for me.

https://www.amazon.com/dp/B08N4PFVP...lja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ&th=1

gtodave · Jan 5, 2022

K3LAG said:
I believe you could actually set the FAT Wrench below the 10 if you wanted to. If it calls for 9, 10 would be fine. Wheeler claims the accuracy is within 2 lbs anyway. I tighten most red dots to about 14-15 in lbs unless it is something unusual.

This. Anything under 10in/lbs is basically finger tight to me. No need for anything that reads under 10 unless you're building watches or something delicate.

Busa · Jan 5, 2022

There is an old engineering adage, a properly torqued bolt will not come loose. No need for thread lockers. That said, you will find thread locker on some factory bolts when dissimilar metals are used in the assembly.

John from MD · Jan 5, 2022

Busa said:
There is an old engineering adage, a properly torqued bolt will not come loose. No need for thread lockers. That said, you will find thread locker on some factory bolts when dissimilar metals are used in the assembly.

And there is a damned good reason for that! :lol:

OnTarget · Jan 6, 2022

John from MD said:
Check this one out. To low a range for me.

https://www.amazon.com/dp/B08N4PFVP...lja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ&th=1

John:
Looking for one with a range of 0.5 to 10. The one you referenced only goes up to 6.
Thanks!

jrumann59 · Jan 6, 2022

Busa said:
There is an old engineering adage, a properly torqued bolt will not come loose. No need for thread lockers. That said, you will find thread locker on some factory bolts when dissimilar metals are used in the assembly.

Except when there is a lot of vibration and thermal cycling. I dont use thread locker to make sure things stay I use thread locker for peace of mind. :innocent0

John from MD · Jan 6, 2022

jrumann59 said:
Except when there is a lot of vibration and thermal cycling. I dont use thread locker to make sure things stay I use thread locker for peace of mind.

If you do that with dissimilar metals, you are in for a big surprise when you go to remove the screws.

Uncle Duke · Jan 6, 2022

DanGuy48 said:
I bought an earlier model of one of these to tighten scope rings to specs.

https://www.youtube.com/watch?v=ZrTuNZH-mYc

I have one of the earlier examples also. While I do think it is reliably accurate, I also think these are oftentimes awkward to use. Especially with slotted screws, I have to be what I think is too cautious for comfort given the design. My concern is that the tool doesn't slip off the work.

John from MD · Jan 6, 2022

Uncle Duke said:
I have one of the earlier examples also. While I do think it is reliably accurate, I also think these are oftentimes awkward to use. Especially with slotted screws, I have to be what I think is too cautious for comfort given the design. My concern is that the tool doesn't slip off the work.

It's definitely different.

Pinecone · Jan 6, 2022

John from MD said:
Check this one out. To low a range for me.

https://www.amazon.com/dp/B08N4PFVP...lja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ&th=1

Same company 10 - 90

https://www.amazon.com/FIRSTINFO-Ad...que+limiting+screwdriver,tools,41&sr=1-6&th=1

Pinecone · Jan 6, 2022

OnTarget said:
John:
Looking for one with a range of 0.5 to 10. The one you referenced only goes up to 6.
Thanks!

This one is 1.33 - 10.18

It looks like you would need two different ones to cover your range.

https://www.amazon.com/FIRSTINFO-Pr...que+limiting+screwdriver,tools,41&sr=1-7&th=1

22collector · Jan 6, 2022

wheeler fat max

outrider58 · Jan 6, 2022

OnTarget said:
The screws are so tiny and go into polymer, I believe. Trying to get one out if broken, well, you know....

What is the optic? Did you already buy it?

You are not going to break a screw in polymer. You can strip the threads(in the polymer). My vote is still hand tight.

rbird7282 · Jan 6, 2022

OnTarget said:
A different question: Which screws do you use for a Holosun 507K-X2 red dot being installed on a SIG 365XL? Package comes with two different sets. Not wanting to ruin the threads.

With the optic off of the pistol, drop the screw down into the hole on the optic and measure how far it protrudes with a pair of calipers. Do that with both screw lengths.
Then check the depth of the holes on the pistol slide. Use the set that's shorter than the depth of holes on the slide.

OnTarget · Jan 7, 2022

There's been some good advice here. Appreciated!

rbird7282 · Jan 7, 2022

If you're mounting that optic to a pistol slide, how is that going into polymer? The screws (At least on my S&W M&P) go through the appropriate spacer/mounting shim and into the steel slide.

outrider58 · Jan 7, 2022

rbird7282 said:
If you're mounting that optic to a pistol slide, how is that going into polymer? The screws (At least on my S&W M&P) go through the appropriate spacer/mounting shim and into the steel slide.

I thought about that too, which was the reason I asked what sight he was mounting. Without an answer, my guess is a Shield of some sort. Their Mini Compact has a polymer body. He's probably worried that if he tightens too much, he'll possibly crack the body or something?

Or, did he see this...

https://www.thearmorylife.com/forum/threads/about-installing-that-smsc-red-dot-on-my-hellcat.4182/

rbird7282 · Jan 7, 2022

outrider58 said:
I thought about that too, which was the reason I asked what sight he was mounting. Without an answer, my guess is a Shield of some sort. Their Mini Compact has a polymer body. He's probably worried that if he tightens too much, he'll possibly crack the body or something?

Or, did he see this...

https://www.thearmorylife.com/forum/threads/about-installing-that-smsc-red-dot-on-my-hellcat.4182/

Even the Shield Plus would have a metal slide correct? Am I missing something? (It's entirely possible) Don't see where there's polymer in the equation unless the body of the optic is made of it.

outrider58 · Jan 7, 2022

rbird7282 said:
Even the Shield Plus would have a metal slide correct? Am I missing something? (It's entirely possible) Don't see where there's polymer in the equation unless the body of the optic is made of it.

That's exactly what I'm saying. The sight body is polymer. A screw could theoretically be over tightened to the point the screw (countersunk?) head would apply too much pressure to the sight body. Without knowing the brand and type of sight, along with the type of screws... :shrug:

This one's body is nylon glass filled polymer. Personally, I'd take a hard pass on one of these...

https://www.shieldpsd.com/portfolio-posts/shield-mini-sight-compact

Variable Torque Adjustment Screwdriver for Red Dot

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