ROTEX24Tapered Adapter Bush for Size 24 Jaw Coupling Hub, 28 mm OD, 13.25–16.75 mm Taper Bore

Product Description

What this part is

A tapered adapter bush for a size 24 ROTEX (KTR) elastomeric jaw coupling. It seats in a 28 mm hub bore and gives the shaft a tapered seat running 13.25 mm to 16.75 mm, which is how a taper-shaft motor or pump is clamped into a straight-bored coupling hub without a keyway doing all the work.

What is in the box — read this first:
This is a single bush, not a coupling and not a complete coupling half. Neither the driving nor the driven ROTEX hub is included, and the flexible element (the star-shaped elastomer insert that transmits the torque, sometimes called the spider) is not included. To make a working drive you need two hubs plus one element in addition to this bush.

What these specs mean in practice

A ROTEX is a jaw coupling: two toothed hubs with an elastomer star between them. It accepts modest misalignment, damps torsional shock, and is fail-safe in the sense that the metal jaws stay engaged even if the element degrades — the machine keeps turning while making a noise, rather than stopping instantly.

Size 24 is the small-to-mid ROTEX size. With the standard 92 Sh A element it is rated in the region of 35 Nm nominal torque; the element hardness you fit changes that figure, so match the element grade to the duty rather than assuming.

The taper is the fit-critical dimension. Measure your shaft taper against the 13.25–16.75 mm range before ordering: a taper bush that is close but not identical will bed unevenly and work loose in service.

Published specifications

Type: tapered adapter bush for elastomeric jaw couplingCoupling series and size: ROTEX 24Outside diameter: 28 mmBore: tapered, 13.25 mm to 16.75 mmCoupling family torque: ROTEX 24 nominal torque in the region of 35 Nm with a standard 92 Sh A elementElement: not includedHubs: not included

Quantity and configuration

One bush. New old stock.

Fitting notes

Clean both the hub bore and the shaft taper dry before assembly — grease on a taper stops it drawing up and it will creep. Draw the bush up progressively and check the hub gap and element clearance afterwards; over-drawing a taper into a coupling hub can distort the jaw geometry. Set the axial gap between the two hubs to the KTR figure for size 24 so the element is not preloaded axially.

Interchange guidance

ROTEX hubs and elements are size-specific: a size 24 element does not fit a 28 or a 19, and no other maker’s jaw element is a legitimate substitute for a KTR ROTEX element of a given size. Other bushes in the size 24 range cover different taper and straight bores — those are related sizes, not equivalents to this one.