Torque Wrenches, calibration, accuracy. - PeachParts Mercedes-Benz Forum

whunter · #1 01-26-2006, 05:32 PM

Torque Wrenches, calibration, accuracy.

Please do not use a torque wrench if you do not understand how it works, what it does, and where/how to check the calibration, accuracy.

What is a Torque Wrench and Why Your Toolbox Needs One

JLW Instruments

webBikeWorld

webBikeWorld page #2.

Tips on Using and Caring for Your Torque Wrench

Have a great day.

mpolli · #2 01-26-2006, 05:53 PM

Thanks whunter. Those are good short explanations. One question I have always had is about thread lubrication. As one of the links mentioned, the lubrication of the thread affects the final torque reading a lot. However it is almost never specified in any manual I have seen. It just lists the torque.

Mike

300EVIL · #3 01-26-2006, 06:35 PM

That's why I got one of these bad boys. It does inch pounds, foot pounds and newton meters at the push of a button. Still needs calibration checked once every 5 years or so but it's damn accurate otherwise.
http://buy1.snapon.com/catalog/item.asp?item_ID=68414&group_ID=17509

whunter · #4 01-26-2006, 08:45 PM

Quote:

Originally Posted by mpolli

Thanks whunter. Those are good short explanations. One question I have always had is about thread lubrication. As one of the links mentioned, the lubrication of the thread affects the final torque reading a lot. However it is almost never specified in any manual I have seen. It just lists the torque.

Mike

Torque / Tension Control: General Data

What is Torque?
http://www.google.com/search?q=What+is+Torque%3F+&rls=com.microsoft:en-us&ie=UTF-8&oe=UTF-8&startIndex=&startPage=1

Dynamic Coatings, Inc.

Perfect Engine Sealing Starts With Proper Head Bolt Use by Larry Carley

Torque Modifiers: Waxes, Lubes and Specialty Chemicals By Thomas S. Doppke
Technical Presentations Co. Sterling Heights, Michigan

Fasteners: Talking Torque

Fatigue of Threaded Fasteners - ASM International.

TORQUE-TENSION REFERENCE GUIDE - Fastenal

Fasteners 101 - Torque Setting - Ti64

http://www.google.com/search?q=Torque+values+for+various+fasteners+&rls=com.microsoft:en-us&ie=UTF-8&oe=UTF-8&startIndex=&startPage=1

Strife · #5 01-27-2006, 02:06 AM

Good stuff. I have Harbor fright torque wrenches and I compared my 1/2" to a neighbors, and they were within 5% of the low and high end of each other. Either they are both totally wrong or they are pretty close. I do know that it is important to store the click types "loose".

Sears sells a torque wrench tester, but it's $1000, I think - I like tools, but I can't justify it (maybe a larger club could?). And of course, even that has to be calibrated eventually. Wish I still worked at a company with a factory - we had an entire metrology department that had EVERYTHING, and I mean, everything - and it was all traceable to NIST standards.

Strife · #6 01-27-2006, 02:10 AM

BTW, that Snap-on unit is of interesting construction. The old-fashioned "beam" torque wrenches were IMHO more rugged but also a pain to use because of their width and the gauge reading problems. Just guessing here, but this must use some kind of a miniature electronic load cell internally.

When the patent expires, it'll be at Sears for $99.95, and Harbor Frieght for $39.99...but I probably won't be doing this stuff by then!

whunter · #7 02-04-2008, 04:00 PM

http://www.boltdepot.com/fastener-information/Bolts/Metric-Recommended-Torque.aspx

http://www.boltdepot.com/fastener-information/Bolts/Metric-Recommended-Torque.aspx

http://www.boltdepot.com/fastener-information/Bolts/

tyl604 · #8 06-15-2009, 03:39 PM

Good and interesting reading but there is a lot of it. Think I might have asked this question before but I cannot quite remember - and I do not see the answer in the articles that I just read.

Bought a half inch torque wrench and see that most of my sockets are 3/8. If I use a reducing socket on the torque wrench in order to use the 3/8 socketes, does it affect the proper calc of the torque?

Think not but not sure.

whunter · #9 06-15-2009, 04:49 PM

Quote:

Originally Posted by tyl604

Good and interesting reading but there is a lot of it. Think I might have asked this question before but I cannot quite remember - and I do not see the answer in the articles that I just read.

Bought a half inch torque wrench and see that most of my sockets are 3/8. If I use a reducing socket on the torque wrench in order to use the 3/8 sockets, does it affect the proper calc of the torque?

Think not but not sure.

The adapter you are asking about is generally considered to have zero effect, but other extensions do require compensation..

torque wrench extension calculator
http://belknaptools.com/extensions-calculator/

Torque Conversion Calculator
http://belknaptools.com/torque-conversion-calculator/

Torque Wrench Crowfoot Extension Calculator
https://belknaptools.com/crowfoot-adapters/

http://www.google.com/search?hl=en&rls=com.microsoft%3Aen-us&q=using+socket+extensions+with+a+torque+wrench&btnG=Search&aq=f&oq=&aqi=

http://www.google.com/search?q=torque+wrench+socket+extension+formula&rls=com.microsoft:en-us&ie=UTF-8&oe=UTF-8&startIndex=&startPage=1

tyl604 · #10 06-15-2009, 07:33 PM

Whunter - I found the exact answer in one of the lines in your reply:

I have never used a torque wrench with an adapter. I have a 1/2" drive wrench and 3/8" drive sockets and an adapter. Do I have to convert the amount of torque applied in this situation?

DRW1000

2005-05-30 21:47:00

Re: Torque conversion 1/2" drive to 3/8" socket
No. Just like you do not need to worry about what socket size you use either. The force only "enters" the wrench at the 1/2" drive point. It also does not matter where you grip the wrench along the shaft It may make it harder for your arm but the reading or click will be accurate.

JonL · #11 06-15-2009, 09:15 PM

With a beam type wrench the position of your grip does have an effect. This is why they have handles that are mounted on a pivot. You are supposed to apply your force with the handle acting through the pivot (in other words, without the handle "bottomed out" one way or the other) so that the line of action of the force is in a precisely known position.

I have not read all the links (it's getting too late tonight), but my strong opinion is that a beam type torque wrench is more accurate than a click type. It does not require calibration as long as it has not been physically damaged or used beyond its rated capacity. It is a less convenient tool than a click type, but it is accurate because of its elegant simplicity.

whunter · #12 07-20-2011, 04:37 PM

1/4" Drive Click Stop Torque Wrench
1/4" Torque Wrench - 20-200 in. lbs.

whunter · #13 02-20-2022, 10:33 PM

I fixed this page Due to a forum member calling me today regarding torque wrench calibration.

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