Table saw arbor nut; How tight is tight enough?

I destroyed the arbor on my unisaw arbor by OVER tightening the nut. I was told by my machine rep/repairman that “sparkplug” tight was correct, hand tighten and then about 1/8 of a turn with the wrench, as the nut will tighten when the saw starts, and over tightening can be bad.

-- Who is John Galt?

Snug is adequate, and +1 for JoeyinSouthAustin.

Overtightening is bad, and can easily distort a saw blade. Arbor nuts are threaded so that they actually tighten when the saw spins, so they don’t need to be very tight. I go slightly more than finger tight….about what JoeyinSouthAustin described.

-- Happiness is like wetting your pants...everyone can see it, but only you can feel the warmth....

Thanks all. I have been overtightening the nut for a long time now. Fortunately there’s no damage. The outside washer has some deformation on it from over-tightening.

Outside washer? Interesting, as my Bosch 4100 has no washer.

waho6o9 does it have an inside flange that will compress (a little) ? If not, doesn’t sound good to me. I have never seen a saw without a compressible washer before the nut.

-- Dwight - "Free legal advice available - contact Dewey, Cheetam & Howe""

“Snug” is all that is needed. I’m getting ready to change an arbor shaft on a saw I just bought because of over tightening.

-- Jim from Doniphan

I’m not sure MonteCristo. I’ve just used it the way it was OEM
I’ll check next time for the inside flnage, and thank you for the
friendly advice.

waho, googled the 4100 manual and the PDF shows an outer washer for the 4100-09.

Waho Check page 30 here I have three of these saw and there is a washer between the nut and the blade, as bogey points out, I just am giving the link.

-- Who is John Galt?

My old Craftsman #113 has a washer as well. Has a bit of a raised center to it, too. I guess to spread the torque a bit?

Tighten by hand, with the blade wrench resting on the openings edge. Finger tight, then just pull the blade towards me against the wrench. Plenty tight.

-- A Planer? I'M the planer, this is what I use

Thank you folks!

JUST snug is good, snug and a bit is how I doit, I broke my wrench when I first got my 1023 on my first blade install learned my lesson them just snug

-- Stevo, work in tha city woodshop in the country

Snug. The blade turns into the thread so it won’t back out.
I suspect there are times when people can’t get their saw to cut straight that this may be the problem. JMHO

-- Don't rollerskate in a buffalo herd