Harmonic Balancer Diameter?

[Alexia]

Does anyone know the actual diameter of the harmonic balancer? I have seen 6.5" mentioned and a few other sources mentioning slightly bigger or smaller than that. I do not have a caliper that goes above six inches so I roughly measured with a measuring tape to 6.5".

[SilverXJ]

It varies between brands. One I had was 7.175". Although hey are usually close to 7".

[jeepxj3]

Is that the overall maximum diameter or the belt area diameter?

[SilverXJ]

Overall OD

[Alexia]

Harbor Freight was having a sale as usual so I picked up a deep jaw digital caliper. The stock 1997 XJ harmonic balancer on my MJ measured 6.5" exactly over the peaks of the splines.

[SilverXJ]

The measurement on the belt area shouldn't change much between brands. I don't have a balancer in front of me but from the specs of the stock style one I sent to ATI for the production of my ATI balancer it measures 6.375" from the top of the rib area. I don't recall which balancer I sent to them though. Might have been the Dorman because it was a POS.