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R&D Flexible Coupling 910-018 for PRM Couplings

Part No. 807118

£432.42 You pay £432.42 Incl VAT You pay £360.35 Excl VAT

RRP £467.48 £389.57

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Brand R&D Marine
Country of Origin United Kingdom
Model 910-018
Gearbox Output Coupling Diameter 7.25" / 184.2mm
Coupling PCD 6.00" / 152.4mm
Number of Fixing Bolts 6
Coupling Register Diameter 3.75" / 95.25mm
Length 2.39" (60.7mm)
Capacity 40HP (29.84KW) Per 100 RPM
Notes Bonding Strip is part number 807740.
Applications PRM 7-1/4" coupling on the PRM 601, 1000 ,1200, 1500 and 1750 gearboxes.
Certification / Approvals Approved by Lloyds register of shipping and Bureau VERITAS

Flexible coupling for boat propeller shaft.

Manufactured by R&D Marine, the flexible coupling fits between the boat propeller shaft coupling and the 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: 184.2mm (7.25")
  • Number of gearbox flange bolts: 6
  • Coupling bolt hole nominal diameter: 16mm (0.63")
  • Bolt PCD: 152.4mm (6.00")
  • Coupling register diameter: 95.25mm (3.75")

Flexible Coupling Details

  • Coupling maximum diameter: 190.5mm (7.5")
  • Length: 60.7mm (2.39")
  • Bolt diameter: 5/8" UNF
  • Capacity per 100 rpm: 29.84kW 40HP
  • Coupling approval: Lloyds Register of Shipping & Bureau Veritas
  • Typical applications: PRM 7¼" coupling on the PRM 601, 1000, 1200, 1500 and 1750 gearboxes
  • Electrical properties: Flexible couplings are as standard non-conducting
  • Earth bonding strip: 807740

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