Torque Wrench Question

[hrosenthal]

I just bought a new digital torque wrench and used it for the first time this morning. It's much easier to work with than my old one that had to be manually set. I noticed something in the instructions that says not to use an extension for the socket, in that it throws off the measurement. The only sockets I have that will fit this wrench (1/2") are deep sockets. Does anyone know if this makes a measurable difference?

[Zaphod]

Using a deep socket or an extension can make it easier for you to apply torque that isn't parallel to the rotation of whatever you're torqueing down. If you take care to keep the torque wrench positioned carefully, it shouldn't be a problem.

[kiki231]

Using a deep socket or an extension can make it easier for you to apply torque that isn't parallel to the rotation of whatever you're torqueing down. If you take care to keep the torque wrench positioned carefully, it shouldn't be a problem.

Precisely. Using an extension , and, to a lesser extent, a deep socket requires diligence by the user to avoid deviating off the rotational axis of the fastener. If that happen, you can end up with an applied torque that is different than what you anticipated.

check this
http://alltorqhydraulictorque.com/pdfs/equipment/Snap-On-Manual.pdf

One other potential downside (if you aren't careful..) is damage to the tool head-- remember the mechanism is designed to respond to twist around an axis that is the center of the drive -- and could suffer damage if subjected to torque in an alternate fashion.

For interest sake, you will notice snap on critically reminds its users to place their hand in the center of the handle during use-- for years i wondered why that would make a difference until i took one apart....

[Avalanche325]

You should always counter torque the head of the torque wrench with the other hand.

[CraigS]

I agree w/ their instructions. I just retired from being an auto tech and can throw my experience into the discussion. 1- when trying to get a big bolt loose w/ an impact wrench you want a short socket w/ no extension. A deep socket,a swivel socket, or an extension kill the power. 2- About 12-15 yrs ago we all started using accutorque sockets for lug nuts. These are a one piece tool that would be similiar to a socket on an 8 inch extension. Of course they have tuned the diameter of the long part as well as the heat treatment so it acts like a spring and limits the torque to the lugnut. Anything other than a short socket affects the torque actually getting to the bolt or nut.