Home Forums Hunting & Shooting Ask The Gunwriters Inch Pound Torque Wrench

Another Fat Wrench user here. It comes with a little chart with their testing measurements. Any torque wrench is 100 times better than doing it by "feel".

FAT wrench for me

https://www.midwayusa.com/product/1017290554?pid=508605

I’ve used the Fat Wrench for years, no complaints

For many years all we needed was a screwdriver.
But that was before they started using tin foil for scope tubes.

Fat Wrench here works just fine for me.

Fat wrench works for me.

I have the CDI as well.

The " Fat Wrench" gets them as close as I need.

I use one I got from Brownells. Works well for me.

Got my Fat Wrench about 4 years ago. No complaints. No problems with anything I've used it on. It's much better than when I used to do that stuff by feel. Once upon a time about 20-25 years ago I was one of those guys who was from the "Farmer Tight" school of thought. Then I progressed to the inch pound by feel method, which is B.S.. That Fat Wrench was a worthwhile expense.

Do you have the QD1R50?

Torque wrenches are for kids who haven’t had much experience with fasteners
Once you develop a feel for machinery it is really easy to tell when it is right, things like lubrication or threadlockers make a torque wrench redundant

cooperfan,

Mine is Q2150R--5 -140

Originally bought years ago, for work, but does double duty

Same here.

This.

Fat Wrench

I agree with most of your posts..........you missed the mark on this one

Total BS.

It is easy to calibrate a cheap torque wrench.
It is much harder to explain how to calculate the max torque for a screw or tapped hole.

The breakthrough for me in calculating max torque for a screw or a hole was reading a post in 2008 by a Caterpillar engineer. 1.5 root = 1.5x minor diameter

https://www.practicalmachinist.com/vb/general/tapped-thread-depth-strength-question-153783/

without all this math. which i despise. i will just tell you what caterpillar standard is.

1 to 1.2 x Dia in steel or cast iron. 1.5 - 2 x Dia in amuminum or other softer metals.

there really is nothing that requres more than 1.5 x as that will generally break even grade 8 hardware before pulling out. 2x if your really worried, and the material is really crappy.

That combined with this link where there is max torque on dry screws, 75% max toque on oil or greased threads, and 50% torque on waxed threads.
http://www.eng-tips.com/viewthread.cfm?qid=143701

I had never realized that screws and bolts break almost all in tension stress and not in torque stress. Torque may cause the tension, but the max tension of the steel is how to calculate the max torque. Given enough female threads, the weak link is the screw breaking. That can be found in table for different grades of bolts.
https://www.engineersedge.com/torque_table_sae.htm

With all this information I was able to figure out how much torque I could apply to shallow 10-32 holes I was drilling and tapping into a Mosin Nagant for a scope base.

I just tighten them down by hand.