[K4KXM]

Holosun specifies 15 inches/lb. of torque, but C&H Precision (the mounting plate I'm using for my Pro Cut) specifies 10 inches/lb. of torque.

Which one do I go with?

 

[rpninja636]

I’d do 10lbs as CHPWS has prescribed. Their plates are made of aluminum which is a softer metal.

 

[Rich Jenkins]

Given that choice I’d pick 15 myself. Either way, I’d put a torque stripe on both screws and keep an eye on them.

 

[Sheepdogged]

I agree with rpninja636. When you have a conflict like that, go with the lesser of the two.

 

[drober30]

Adding the plate may change the torque requirement. Add blue thread locker and witness marks.

 

[rpol98]

Given that choice I’d pick 15 myself. Either way, I’d put a torque stripe on both screws and keep an eye on them.

@Rich Jenkins
just curious, what kind of marking pen do you use for the torque stripe? some sort of fine-tip paint pen?

 

[jetrinka]

@Rich Jenkins
just curious, what kind of marking pen do you use for the torque stripe? some sort of fine-tip paint pen?

Silver fine tipped sharpie has worked well for me

 

[Rich Jenkins]

@Rich Jenkins
just curious, what kind of marking pen do you use for the torque stripe? some sort of fine-tip paint pen?

Either a sharpie like @jetrinka or gray nail polish on the tip of a toothpick.

 

[Brian_Patrick]

I like a fine Sharpie the best.

 

[Rich Jenkins]

Adding the plate may change the torque requirement. Add blue thread locker and witness marks.

Hmm. But the plate would be similar to a crush washer on an oil drain plug, no? And in either case (washer / no washer) I’d torque to the same value. So why would inserting a plate change the torque value of the fastener?

 

[K4KXM]

UPDATE: I contacted C&H and they said to go with their 10 lb. torque value.

 

[cmdrcody]

You always go to the lower torque setting, because higher torque could lead to failure.

 

[drober30]

Hmm. But the plate would be similar to a crush washer on an oil drain plug, no? And in either case (washer / no washer) I’d torque to the same value. So why would inserting a plate change the torque value of the fastener?

If you Google it, adding a washer can change a torque spec requirement. An oil pan bolt may include a crush washer by design and a proper torque spec is issued based on that.

The manual calls for 15 ft-lb and C&H says 10 ft-lb so it could be their plate hardness that changes the requirement... I have no idea, I was just increasing my post count...lol

 

[Rich Jenkins]

If you Google it, adding a washer can change a torque spec requirement. An oil pan bolt may include a crush washer by design and a proper torque spec is issued based on that.

The manual calls for 15 ft-lb and C&H says 10 ft-lb so it could be their plate hardness that changes the requirement... I have no idea, I was just increasing my post count...lol

Thanks, I find this stuff interesting, so I’ll look into it some more.

I suspect either value would work fine, but the use of an aluminum plate would concern me enough (potential for the CHPWS aluminum to deform more under compression, than say the nitrided steel plate that Forward Controls uses) to torque stripe it and recheck torque every 500 rounds or so.

10 in lb is not a lot, I’d be sure and use a torque wrench or fix it stick that has a current cal sticker to some kind of metrology standard.

 

[Green Dragoon]

If you Google it, adding a washer can change a torque spec requirement. An oil pan bolt may include a crush washer by design and a proper torque spec is issued based on that.

The manual calls for 15 ft-lb and C&H says 10 ft-lb so it could be their plate hardness that changes the requirement... I have no idea, I was just increasing my post count...lol

C&H is in inch-pounds just for clarity.