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Purpose of a Flanged bush

Purpose of a Flanged bush

Purpose of a Flanged bush

Can someone help understand the difference between a sleeve and flanged bush? What is the use of a flanged bush and this effect be achieved by some other means?

RE: Purpose of a Flanged bush

Well, a flanged bush(ing) has a flange. A sleeve doesn't.

Of course these are colloquial terms, that have not inherent specific meaning. A sketch would aid discussion.

But for example, a flanged bushing can support axial loads while a sleeve should not.

RE: Purpose of a Flanged bush

i think the main function of the flange is to act like a washer, secondary function is to help locate the bushing.

another day in paradise, or is paradise one day closer ?

RE: Purpose of a Flanged bush

And keep it from falling out on at least one side.

RE: Purpose of a Flanged bush


The effective bore/bearing-length of an unmodified flanged bushing... for the same shank length and nominal small standard chamfers... is lightly longer.

As noted, the most common purpose for flat surfaces of the flange is an integral 'plain washer-bearing' to avoid superficial fretting on mating surfaces.

Also, Some flanged-bushes are installed with deliberately 'thick' flanges... which are subsequently machined simultaneously using rigid sets of milling-cutters to ensure ultra precise side-to-side positioning, face-to-face spacing and parallel surfaces.

In some cases I have see 'flat thick flanges' recessed in spot-faces [counter-bores].

Flanged bushes can also have 'countersunk-flanges'... 90, 100, 120, 130, etc countersink angles... and the top of the bush flange may be set flush-to-high with the surface.

Regards, Wil Taylor

o Trust - But Verify!
o We believe to be true what we prefer to be true. [Unknown]
o For those who believe, no proof is required; for those who cannot believe, no proof is possible. [variation,Stuart Chase]
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RE: Purpose of a Flanged bush

Quote (WKTaylor)

integral 'plain washer-bearing' to avoid superficial fretting on mating surfaces.

...including joints that experience rotation.


RE: Purpose of a Flanged bush

From an assembly point of view a flanged bush is much easier to deal with, just push it in until it stops moving! Of course a wily designer will specify that an unflanged bush should be pushed in until the end of the outer sleeve is flush with the surrounding part, but that is not quite as robust.

So far as the bush manufacturer is concerned an unflanged bush is cheaper as it can be sized in a continuous die, whereas a flanged bush has to be sized either internally or in a closed ended operation. Sizing is the process of plastically deforming the outer sleeve so that that the rubber is all in compression, which is essential for durability. Some bushes are sized during installation, I don't like that.


Greg Locock

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RE: Purpose of a Flanged bush

A flange also can tighten a gap to reduce fastener bending.

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