How To Calibrate A Torque Wrench 

Brilliantly explained Steve ! Funny how some vids attempting to show the same thing with 40k or 50k views simply fail to explain it as clearly as you have. Well done kind sir and lucky me I have the exact same Tekton wrench and a bench vice.

Dude THANK YOU! This was informative, professional, and easy to follow!

Man you explained this in the most simplest form possible. Very much appreciated.

Hey Steve, thanks for the video. Just calibrated my 20-250 ft-lb TW which was way out. Real good and simple explanation.

I hope you also checked your exercise weights. I had a creeping feeling that it would be easy for manufacturers to overcharge by underweighting them. Sure enough, NO brand matched the marked weight. They ranged up to 10% off, usually under weight.

You are the only person that uses an Allen key method, everyone else undoes the end nut. No good if my torque wrench doesn't have it. Thanks.

Is a torque wrench linear? I would like to see a check at 10% and 90% of the wrenches range. I just wonder that with just one adjustment screw, would it be more accurate to calibrate at 50% of range.

on amazon, I just bought the 1/2in 10-150lb torque wrench and it does say that it does come pre-calibrated with a 4% +/- accuracy ready to use. So, looks like they are knowing there are some slight variations with these things but overall I think they are pretty accurate for most things.

Thanks for this video. I have to change valve covers and they have a two part torque sequence. I want to make sure my TW is as accurate as possible. Thanks 👍🏽

It’s MAY 2024 and I don’t think you have to do math. The spring TENSION and length of the handle have been taken into consideration for the torque wrench. So essentially if you hung the weight at the beginning of the handle, the torque wrench should click at the weight you were testing. However, there is the weight of the torque wrench itself that is also pulling down, so if you were testing 20 pounds I would put your torque wrench may be at 21 Just a smidge over 20. BTW, UR torque wrench did click at the beginning of the handle. If you had adjusted the torque just a smidge, I think the wrench would have held and was in perfect calibration.

perfect! now all I gota do is find some bolts, drill some holes and bolt my vice to a table! although I was planning on calibrating one of mine at 50 lbs (I've got multiple as well) so hopefully they can hold that otherwise awesome video!

hey steve great video, just my 2 cents- better to use a socket in the wise rather than the actual torque wrench drive shaft!!! also at 1:56 marking shouldn't be on the aluminum rim on the T.wrench that will damage the mechanism, all OEM's recommend to calibrate from the center of the handle of the torque wrench for accurate results. I have the same model and you can take the measurement to 1.5ft on the handle rather than the body. I use a 19mm bolt welded on a steel plate to do the calibration, that removes any need for the vice ... hope that helps

Seems like it would be more accurate to hang the weight closer to the end of the handle, since that's where I usually apply force when torquing(?)

Thank you I found this very useful Steve

Thanks for this video, you made it really simple to follow.

Tanks For this educational video Steve.I tried different Allen wrench size ,but didn't work.Would you please tell me what Allen size work with this TAKTON torque wrench.I have 3/8 inch drive click Torque wrench.

Steve, a Very good tutorial video thanks for sharing.👍👍👍🍺

So here is the metric formula: force=weight×9.81×length of the tape marking. If the weight is 10 kg and the tape marking is 0.4 m it should look like this: 10kg×9.81=98.1. 98.1×0.4=39.2 NM. If you put weight of 10 kg to 04 m lenght the wrench should click on 39.2 NM. Hope I was clear.

What's the formula for the inch pound wrenches?

Nicely demonstrated. Very clear instructions.

Excellent video Steve 👍

how calibrate on a torque1/4 drive that are 10 inch long ???

Wow subscribed this blew my mind thanks steve🤙

Thank you

Nice! Simplest solution. However, aren't torque wrenchs supposed to be pulled at the handle? And would this make a difference in the calibration if not measured at a point along the handle?

Excellent video. Thanks

Thanks a lot, Steve. I can hardly wait to calibrate my Tektron wrench. One question, what key should I use for the calibration screw?

why did you put the blue tape in the nm (12") and not a litlle longer than 12", near the site where we put the hand to operate the wrench?

Very cool. The weights are not exactly 20 lbs. so what is the margin of error?

Thanks, I learned something new today from your video, and some of the comments below. However, unless you had an accurate way to measure the mass of those weights, you are assuming they are correct. If each 10 lb weight was 9.5 lbs (and I wouldn't be surprised), you may have brought your torque wrench out of spec. I really like David Mitchell's suggestion though and check the torque throughout the range.

question, why not put the tape at the handle where we place our hands? thank you

I've wondered if mine was correct. I'll use this. Thanks.

Thanks! If I have a Big torque wrench, and it has a two foot handle, what’s the formula? It’s easier to test 20 pounds at two feet than 40 pounds at one foot

Great video!! Very useful 👍👍👍

Thank you exelent video God bless you

awesome video! thank you for sharing this one

Hi i have 2nm-24nm 1/4 torque wrench may be you can give me advise how many kg i can use and what distance the marker on the handle to calibrate thanks

I wouldn't do it this way. Torque (ft-lbs) = Distance (feet) x Force (lbs). Distance is the "Torque Arm" where the force is applied, and the force is applied at the handle. I would measure from the handle to the center of the drive shaft. To figure the weight to hang at the handle, I'd use this formula: x lbs = 20 ft-lbs / Distance in ft. For example: x lbs = 20 ft-lbs / 1.25 feet = 16 lbs. You would hang 16 lbs at the handle in this example to get a 20 ft-lb torque. You could play with the numbers to figure out a way to get something rounded to your weight. The other thing I have a concern about is that you tested the torque at just the lower end of the the wrench's range. According to the official ASME method, torque wrenches are tested at 20%, 60%, and 100% of the wrench's range. That is three measurements across the range. Even if you find out the low range is good with your method, what about he mid-range and the upper range? It would be hard to use your method to check the mid-range and upper range of wrenches that measures higher torque. It would probably be a better idea to have a pro calibrate your torque wrenches if you want them to be more accurate and to spec.

ماذا لو وضعنا 2 زنبرك واحد للشد ولاخر للفتح

(Amount of weight hanging from the center of the handle × Inches from the square drive to the center of the handle) ÷ 12. If anyone wants to calibrate it from the center of the handle.

The task of calibrating a click torque wrench has me somewhat baffled. Some use the grub screw, as in this video to calibrate and some calibrate by adjusting the threaded locking peg cup that screws into both the handle and the hex end nut.

Excellent, thanks.

I have the same torque wrench. What size Allen key is that?

What size allen key did you use? None of my english ones seem to work.

Hey, just a quick question, does the weight of the wrench handle need to be taken into consideration? i have the same wrench and it is quite hefty, thanks!

Can you do the same thing with a deflection beam torque wrench? If your torque wrench is off how would you calibrate a deflection beam torque wrench?

Thanks!

So I dont have a bench vice to use. What should I use to hold the torque wrench?

The error I see is; A torque wrench is designed to be pulled, or force applied at the 👉Handle. Not mid-way up the arm.

Is the measuring distance the same for all wrenches? Like 3/8 for example

excellent vid...

The weight of the handle throwing everything off: ( ͡° ͜ʖ ͡°) I done oopsed it all up hehe

A proper calibration would be at 5 points from 20% to 100% that would be at 30, 60, 90, 120, 150 foot pounds. The ANSI. spec for torque wrenches allows 4% of the reading. 20 foot pounds is only 13.3% of the range and at that low level a wrench can be off by 1.2 foot pounds. When tested at 20 foot pounds the wrench looked like it clicked at about 13 inches which would be 21.6 foot pounds. Most torque wrench manufacturers do not recommend using a wrench below below 20% and I certainly would not adjust one at the 20% point.

Thank you steve ur the best!!!

Finally pretty informative short educative easy to understand guide how to test torque wrench thanks