#### MolaKule

**Staff member**

Two other names for a zero clearance fit are an ------------ fit and a -------- fit.

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- Thread starter MolaKule
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Two other names for a zero clearance fit are an ------------ fit and a -------- fit.

"interference" is the first one.

pressed

Interference fit or friction fit

Wouldn't an interference fit be a "negative clearance" fit?

We have a machinist at work whose interference fits give us fits. Coupling hubs smoking on the induction heater…Wouldn't an interference fit be a "negative clearance" fit

NO, it would be a zero clearance fit.Wouldn't an interference fit be a "negative clearance" fit?

One of the poster's has provided the correct answer.

That is correct, a zero clearance fit is also called an interference fit and a friction fit.Interference fit or friction fit

Let's say we have a hub with an internal bearing race that is supposed to have a very tight fit inside the hub. The outer diameter of the race and the inner diameter of the hub, for our purposes, are the same.

A process by which we can do this, is to bring the race down to a low temp (which contracts its outer diameter) to fit just inside the hubs inner diameter, and then let it expand into the inner diameter of the hub as it warms up.

Of course, if the race's outer diameter is machined to just slightly less than the hubs inner diameter, we may be able to just "pound it in" for a friction fit.

So we were looking for definitions, not how one might execute these fits.

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