See post #369
I used both a 300 ft.lb. TQ wrench from HF, but the one that really got it torqued down was a regular (but higher quality) SK 150 ft.lb. TQ wrench and an extension I welded up
Going by this online calculator, I only needed to crank the 1/2" SK TQ wrench to 118ft.lbs.
The HF TQ wrench was a brand new replacement for one of my workers as his previous one wouldn't click.
My calibration cube only works up to 147 ft.lbs., so I was only able to check the smaller SK TQ wrench and trusted the extension combo more than the big HF wrench