Snap On Torque Wrench Calibration Question

[upperb]

Hi all.

I recently purchased a used Snap-On QJR 3250A click-type torque wrench. I also bought a Powerbuilt digital torque adapter, so that I can test the wrench frequently and cheaper than sending it out to be done.

Is the allen screw at the end of the wrench the one I need to move to adjust the wrench if the calibration is off? Is there a set-screw that I am not seeing that needs to be loosened before I try moving this allen screw? I don't want to damage the wrench by trying to turn the allen screw if a set screw needs to be loosened first. My internet searches to get an answer to this question have not turned anything up.

Thank you all for any help you may give me.

 

[gdocktor3]

I'm probably way off here, but the clicker style torque wrenches I have do use an Allen, but there is also a nut threaded on further up that needs to be loosened first before you can adjust it.

 

[T45]

I recently purchased a used Snap-On QJR 3250A click-type torque wrench. ...

Is the allen screw at the end of the wrench the one I need to move to adjust the wrench if the calibration is off?

You need to get the manual for that particular wrench.

The modern versions (qcr, qdr etc) oem by CDI use proprieray shims and require complete dis-assembly. The earlier snap-on micrometer wrench versions I believe were Precision Instruments OEM, so maybe look for one of their technical reference manuals from that maker. the micrometers wrench types I have seen have never adjusted with an allen key, although the split beam types do have this ability--which allows you to adjust the calibration without dis-assembly. But I've never seen a tear down on PI clickers.

Hope this is helpful. Good luck !

 

[6PTsocket]

I have no expertise with this wrench but what I have read about professional calibration is that it is not checkehttp://www.njwoodturners.com/d at just one point but checked at 100%, 20%, and some intermediate point and the setting is chosen to get all three readings to fall within the published specs with as little error as possible. I think the middle reading might be 40%, not sure. I am sure your Powerbuilt is fine but the normal standard for calibration of most things is that the standard be a decimal point better than the tool. For a 3 or 4 % torque wrench, that would be 0.3 or 0.4 %

Sent from my SM-G900V using Tapatalk

 

[6PTsocket]

Please excuse the line of junk that got into my post, above. Can tapatalk posts be edited?

Sent from my SM-G900V using Tapatalk

 

[upperb]

Many thanks to all of you who have replied. Any thoughts on where I might obtain a manual for this wrench? Once again, my internet search has produced nothing.

Again, thanks.

 

[bmwpowere36m3]

Send the wrench out and have it done professionally ($50-60 Angle Repair, or Team Torque or Snap-On themselves)... if you're a weekend warrior, you'll be good for a LONG time. How you know the Powerbuilt is calibrated correctly? In addition, to calibrate a tool the control needs to be 10x more accurate.

Early SO wrenches have an allen adjustment at the bottom of the handle, but sometimes is requires a change to a block inside.

 

[T45]

The range of error is of the typical wrench is +/- 4%, in other words an 8% of scale amount of variance...

1/10x8% =0.8%, so IMHO 1% is fine for sanity checking

You need more advanced 0.5% units to calibrate 1-2% torque spec'd designs like dial wrenches and electrongic strain gauges.

 

[stage20]

Snap on charges 80 bucks to calibrate a wrench. My friend works at mountz pro....Not sure what they charge but they do calibration as well. Location in California and alabama

 

[guy48065]

On that model the allen head on the end is a nut and it holds the handle onto a spline on the internal threaded shaft. If your wrench is in the ballpark you just remove the nut, back the handle off about 1/4" to clear the spline, then rotate the handle until the scale agrees with the standard. Push the handle back on the spline and reinstall the nut.

If you're off more than ~5 lbs then you get into needing specialty shims. Send it in.

 

[ptschram]

DO NOT send that torque wrench back to Snap-On!

It has been obsolete for many years and it may come back in pieces.

 

[mrborohachi]

Snap-on/CDI will only calibrate this style of split beam 1/2 torque wrench.

They will not take/calibrate this previous style tubular metal handle.

I was literally at their doorstep and calling them to get an older 1/2" dr split-beam wrench calibrated.

 

[scissorman]

You better find a different dealer to send your torque to for calibration. I just sent in my old style split beam 3 weeks ago for calibration and got it back last week. The cost is a flat $68 charge which includes any bad parts.

 

[Zimbo]

Ptschram is dead right, I have been down this road twice with the QJR series
torque wrenches from Snap on, utter junk once they go out of calibration no
Support at all.
Best by a long way are the PI wrench split beams.