Which Impact Wrench Should I Choose: M12 3/8″ or 1/2″?

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Asked By WackyGear23 On

I'm trying to decide between the M12 1/2" and 3/8" impact wrenches. I'll be using it for car and tire work and want to buy just one. Should I go with the 3/8" and use a half-inch adapter, or is it better to choose the half-inch and use a 3/8" adapter? I'm aware that using an adapter can reduce power, but I'd like to know what the community thinks is the best option for versatility. Any advice would be appreciated!

3 Answers

Answered By ToolMaster9 On

Both my M18 mid torque and M12 stubby are 1/2", and I've never had a problem with adapters. I actually saw a video that mentioned a significant power loss when going from 3/8" to 1/2", about 20%, whereas the reverse situation is only about 7%.

HelpfulHank44 -

Thanks for sharing that info! It sounds like going with a 1/2" might be the way to go.

Answered By CraftySparrow87 On

If you're looking to buy just one, I'd recommend the M12 1/2" impact. It's more versatile for all-around use, especially for jobs like removing lug nuts.

CuriousFox42 -

Why do you think the 1/2" is a better choice?

Answered By HandyDude01 On

I chose the 3/8" since I typically work on smaller projects. It's good enough for heavier tasks too—I've taken down my power rack without losing much power using a 1/2" adapter on larger bolts.

ToolTamer97 -

That’s reassuring! I'm still doing some research, but your experience helps.

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