• Type of Prime Mover
• Kilowatt (kw) or Torque Rating

• Rotational speed rpm

• What application the coupling
is to be used on

• Type of duty (eg. reversing or
unidirectional, frequency of starts and
peak torques)

• Diameter of drive and driven shafts

• Any gaps such as limited end float

• Any other physical limitations

• Any other specific needs

Note: Where high peak loads and brake
applications please contact Bibby
Transmissions.

Rating - To determine the torque rating
calculate using the procedures given on
page 4.
Information may also be found on the
nameplate of the motor etc.

Service Factor - When selecting a
coupling it is important to consider the
characteristics of the drive and driven
equipment. A figure known as the Service
Factor has been calculated based on an
average of a wide range of applications.
This can be used as a guide in the selection
process and is displayed in Table 1 on
page 2.

Size - In making the selection from the
following product group’s which is most
suited to the application, select a size
equal to or, higher than the rating
calculated. Particular attention should be
made to bore sizes and guidance for this
is in the Table related to Max Bore Sizes.

Speed - Ensure that the speed is
compatible.

Should full information not be supplied
to Bibby Transmissions at the time of
ordering it will be the responsibility of
the customer to ensure that the coupling

As our policy is one of continual
improvement, this specification is not to
be regarded as binding in any way, and is
subject to alteration without notice.
Certified drawings are available on
request.