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Marine Gearbox Couplings

Marine Coupling Search

Click on the link above to use the marine coupling search tool. You will find many selections for most common applications. IsoFlex couplings are configured to fit many common gearbox output shafts.
Note: Some gearbox output flanges are either too small or have too many bolt holes to allow direct fitting of an IsoFlex coupling. You may need to fit a cotton reel, spool or “bobbin” adaptor.

If you cannot find your gearbox, take the relevant dimensions and consider the IsoFlex coupling dimensions listed below. For high demand applications, ie. commercial, high frequency directional changes, high reduction ratios, etc., please check torque demand or refer to IsoFlex for assistance.

Torque calculators and conversions:

Torque (Nm) = (Engine power (hp) x 7124 x gear reduction ratio)/Engine RPM
Torque (ft-lb) = (Engine power (hp) x 5252 x gear reduction ratio)/Engine RPM
Torque (Nm) = Engine power (kW) x 9550 x gear reduction ratio)/Engine RPM
Torque (ft-lb) = Engine power (kW) x 7038 x gear reduction ratio)/Engine RPM
Torque (Nm) = 1.356 x Torque (ft-lb)
Torque (ft-lb) = 0.737 x Torque (Nm)

  • GEARguard 4 Bolt Couplings

    GEARguard 4 Bolt Couplings

    "Four" bolt couplings are used on four bolt hole gearbox output flanges. Spigots or pilots can be either make or female. IsoFlex couplings are configured to the most common flanges....

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  • GEARguard 6 Bolt Couplings

    GEARguard 6 Bolt Couplings

    "Six" bolt couplings are used on six bolt hole gearbox output flanges. Spigots or pilots can be either male or female. IsoFlex couplings are configured to the most common flanges. Note certain couplings need a T bush kit.  ...

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  • GEARguard 8 Bolt Couplings

    GEARguard 8 Bolt Couplings

    "Eight" bolt couplings are used on eight bolt hole gearbox output flanges. Spigots or pilots can be either male or female. IsoFlex couplings are configured to the most common flanges. On "eight" bolt couplings, special steel spigots, pilots or registers are fitted to maintain...

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  • GEARguard 10 Bolt Couplings

    GEARguard 10 Bolt Couplings

    "Ten" bolt couplings are used on ten bolt hole gearbox output flanges. Spigots or pilots can be either male or female. IsoFlex couplings are configured to the most common flanges....

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  • Spicer/Uni-Joint Couplings

    Spicer/Uni-Joint Couplings

    Spicer or Uni-Joint couplings are used on drive shaft flanges configured to standard Spicer, Uni-Joint or cardan shaft drives. Please check torque demands. ...

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