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The frame affords journal bearing to a ring a, having four projections b, to which are a close but easy sliding fit, the steadying jaws c.

There are in general machine work four kinds of fit, as follow: The working or sliding fit; the driving fit; the hydraulic press fit; and the shrinkage fit.

Sixth, this will leave the bottom brass a tight driving fit, and the top a hand sliding fit, which is desirable, because the top brass has to be taken out to get the rod off while the bottom brass remains in its place.

It is obvious that in a working or sliding fit the enveloped piece must be smaller than that enveloping it, or one piece could not pass within the other.

These contain two dies; the upper one, which meets the threaded end of c, being a sliding fit, and the joint faces being formed as shown at a, b.