Transitional Fits a Question

Answer from Ask Jeeves

Bearing Fits Cylindrical roller bearings often use a transitional fit instead of a sliding fit when axial movement of the race is not required. From:

And, how does this explain the definition of "transitional fit"?

On Fri, 12 Sep 2003 12:49:29 GMT, "Bob Swinney" pixelated:

I got curious, too, so here are some findings:

googling "transitional fit machining", then "transitional interference fits"

googling "k6 fits"

(Oops, time to get to work.)

- - - - - - - - - - - - - - - - - - Heart Attacks: God's revenge for eating his little animal friends --

A Transitional fit is a fit which can be either a Clearance or an Interferance fit (in otherwords for the application in question it doesn't matter one way or the other). Ken

Machinery's Handbook 12th Edition page 1132.

Terms Applied to General Classes of Fits. Transition Fit: Term applied when the limits admit of either clearance or interference fits being obtained.

Clear as mud? What does it actually mean in practice? My idea would be that the part being machined to an interference, press, shrinkage fit etc would have a transition section machined to act as a go no-go gge or a slight taper/chamfer to act as early warning or both, size permitting of course.

How do you guys/gals judge when to stop machining, say for a push fit as in keyed shaft and such like? 'Just one more light cut. Oh fiddle, it's now a sloppy fit. Start again' etc etc as happens regularly. GeoffH Norfolk UK

's easy. Machine a 1" shaft +/- 1/16". The limit admits of either clearance or interference in a 1" hole

Mark Rand RTFM

They're sometimes seen in people during the transition from married to single.