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R&D Flexible Coupling 910-022 for Twin Disc Couplings

Part No. 807122

£669.47 You pay £669.47 Incl VAT You pay £557.89 Excl VAT

RRP £723.74 £603.12

Save £54.27 (7.5%) Save £45.23 (7.5%)


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Brand R&D Marine
Country of Origin United Kingdom
Model 910-022
Gearbox Output Coupling Diameter 9.00" / 228.6mm
Coupling PCD 7.50" / 190.5mm
Number of Fixing Bolts 8
Coupling Register Diameter 6.00" / 152.4mm
Length 1.75" (44.5mm)
Capacity 65HP (48.47KW) Per 100 RPM
Notes This coupling is fitted with a shouldered bush to locate in the gearbox flange. Bonding Strip is part number 807743.
Applications Twin Disc MG gearboxes with 9" coupling flange
Certification / Approvals Approved by Lloyds register of shipping and Bureau VERITAS

Flexible couplings for boat propeller shafts.

Manufactured by R&D Marine, the flexible coupling fits between the boat propeller shaft coupling and the Twin Disc gearbox output coupling. This flexible coupling consists of a contoured flexible disc moulded in tough yet resilient new type Polyester Elastomer. The contoured coupling disc gives clearance for bolt heads, and allows the coupling to flex freely to take up any temporary misalignment of the engine and propeller shaft, due to flexing of the boat structure or the engine moving on its rubber engine mountings. Forward thrust is taken in compression on the coupling disc between the two shaft half couplings and reverse thrust is taken again in compression on the coupling disc between the two fail safe straps. A safety feature of the R&D 910 series flexible couplings is that in the unlikely event of a coupling disc failure, the steel straps make the coupling fail safe and ensure propeller shaft drive is maintained in both forward and reverse.

Gearbox Flange Dimensions

  • Diameter: 228.6mm (9.00")
  • Number of gearbox flange bolts: 8
  • Coupling bolt hole nominal diameter: 22.6mm (0.89")
  • Bolt PCD: 190.5mm (7.50")
  • Coupling register diameter: 152.4mm (6.00")

Flexible Coupling Details

  • Coupling maximum diameter: 222.2mm (8.75")
  • Length: 44.5mm (1.75")
  • Bolt diameter: 1/2" UNF
  • Fitted with a shouldered bush to locate in the gearbox flange
  • Capacity per 100 rpm: 48.47kW 65HP
  • Coupling approval: Lloyds Register of Shipping & Bureau Veritas
  • Typical applications: Twin Disc MG gearboxes with 9" coupling flange
  • Electrical properties: Flexible couplings are as standard non-conducting
  • Earth bonding strip: 807743

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