Wanted: 1/2" drive Torque Wrench

skivi · Post by **skivi** » Tue Sep 07, 2010 11:09 pm

Wanted: 1/2" drive Torque Wrench
Info: click, digital or beam type i don't care, it just has to be accurate
Price: will pay up to around $150
Location: sud ost Bay area melburg

-Nick

IN2VWS · Post by **IN2VWS** » Wed Sep 08, 2010 6:58 am

.............and what torque range should it be?

byronmcmanus59 · Post by **byronmcmanus59** » Wed Sep 08, 2010 8:03 am

for a $150 im not too sure you'll find an accurate one or one that will stay accurate for very long

Volumex · Post by **Volumex** » Wed Sep 08, 2010 1:28 pm

Torque wrenches are seriously over-rated. They are only 25% accurate at getting the nominated bolt force. (Ajax Handbook - can't find a decent link) They are very accurate at putting the correct torque onto the bolt, but that doesn't matter as that is not the aim of the bolting - its getting the correct load onto the bolt that is important.

I've been involved in bolting some DN750 flanges. We had a bolt force required, and we measured the strain of the bolt to ensure we got the correct bolt force. As part of the procedure we also measured the torque required to get the bolt force. It varied from 170 and 500+ Nm of torque.
There is so much variability in friction, dimensions etc that you might as well use the cheapest torque wrench you can find, as it is only slightly better than doing it by feel.

Post by **hertz** » Wed Sep 08, 2010 3:29 pm

http://cgi.ebay.de/HAZET-Drehmomentschl ... 500wt_1154

Post by **hertz** » Wed Sep 08, 2010 3:30 pm

http://cgi.ebay.de/Hazet-5122-2CT-Drehm ... 53e35f036c

Post by **hertz** » Wed Sep 08, 2010 3:31 pm

http://cgi.ebay.de/Hazet-5122-2CT-Drehm ... 53e35f036c

Post by **hertz** » Wed Sep 08, 2010 3:31 pm

skivi · Post by **skivi** » Wed Sep 08, 2010 8:11 pm

hi lads, it's for my motorbike, looking through my manual the Torque wrench needs to be able to encompass jobs from 5Nm/3.6lbf ft to about 88Nm/65lbf ft

Volumex interesting that you say get a clunker as most say the opposite to me.

byronmcmanus59 · Post by **byronmcmanus59** » Wed Sep 08, 2010 8:40 pm

Volumex wrote:Torque wrenches are seriously over-rated. They are only 25% accurate at getting the nominated bolt force. (Ajax Handbook - can't find a decent link) They are very accurate at putting the correct torque onto the bolt, but that doesn't matter as that is not the aim of the bolting - its getting the correct load onto the bolt that is important.

I've been involved in bolting some DN750 flanges. We had a bolt force required, and we measured the strain of the bolt to ensure we got the correct bolt force. As part of the procedure we also measured the torque required to get the bolt force. It varied from 170 and 500+ Nm of torque.
There is so much variability in friction, dimensions etc that you might as well use the cheapest torque wrench you can find, as it is only slightly better than doing it by feel.

There's something seriously going wrong if your getting variations or 330nm, if you prep your bolt heads (machine finish) and use the correct compound to eliminate friction you shouldn't have variation or very minimal..

P.s Skivi, are you sure you need a 1/2 wrench.. I use a 1/4 warren and brown on my motorbike..

skivi · Post by **skivi** » Wed Sep 08, 2010 8:59 pm

most of my sockets are 1/2" i think the 10mm and smaller sizes are 1/4' but i have an adapter.

1/4" Torque Wrench's sem to have the range i need, maybe i should just invest in a 1/4" drive socket set as well, the one i use now is a 2 generation old mix-n-match Kingchrome set with plenty of patina.