4 Things to Know About Tightening a Chainsaw Bar Nut

Hand-tighten snug, then a quarter turn Tighten by hand with the wrench until the nut is snug, then give it another quarter turn. That’s close enough to the 15–25 ft-lbs most saws specify.

A torque wrench is overkill The bar has to move slightly when you adjust chain tension later anyway. Overtighten and you risk stripping threads in the plastic or magnesium housing.

Use the L-shaped wrench that came with the saw It’s designed so you can’t really overdo it by hand. If you’re using a ratchet or a power tool, stop — you’re asking for a broken stud.

Undertightening causes wandering A loose bar throws the chain off and makes you adjust more often. Future you has better things to do than helicoil a chainsaw crankcase.