MERCRUISER V6 - V8 ALPHA BASE COUPLING - 18643A5
Coupling for Mercruiser V6 - V8 engines with an Alpha One base.

Ensure smooth and secure power transmission with our marine couplings, designed to link your engine to the propeller shaft efficiently.
The marine coupling absorbs shocks and compensates for slight misalignments, protecting both the engine and the drivetrain.
Engineered to limit vibrations and noise levels, our couplings improve comfort and extend the life of your transmission system.
Available for various marine engines including Volvo, Mercruiser, OMC, PCM, and more.
Coupling for Mercruiser V6 - V8 engines with an Alpha One base.
Yanmar coupling diameter 190mm.
5 Springs
6 Mounting holes
26 Grooves
Coupling for Yanmar JH series engine with ZF reverse gear type ZF25 and ZF30.
Outer diameter: 19cm
Height: 42mm
26 grooves
When replacing a Kanzaki brand Yanmar reverse gear with a ZF reverse gear, it is necessary to also replace the coupling using this reference.
Engine coupling with 15 splines replacing the old assemblies for PCM Power plus 1.23 and PCM 1:1 inverters.
Features:
- 15 grooves
- External diameter: 335mm
- Inner diameter: 25mm
- Height: 31mm
New generation of PCM damper replacing the old generation triangular type couplings (R140016 and R140016A) on PCM IRM40A inverter.
For Borg Warner - Velvet drive inverter assemblies, refer to reference 14001 with 26 splines.
Universal triangular coupling with 26 splines.
Coupling for Diesel engines with a Bravo base such as Mercruiser - Nanni.
Coupling for Volvo application with the following characteristics:
- 26 grooves
- Diameter 34mm
- 825NM of torque
- 8 springs
Engine applications:
- All 41 series engines
- KAD42A - KAD42B - KAD42P-A - KAMD42A
- KAD43P-A
- KAD44P-A - KAD44P-B - KAD44P-C
- KAD300A - KAMD300A
PCM brand engine coupling with the following characteristics:
- 6 springs
- 26 grooves
- External diameter 33.5 cm
- Inner diameter 34 mm
Yanmar 10-spline coupling for KBW10 reverse gear on saildrive.
External diameter 190 mm.
New generation coupling for PCM engine based on Ford 302 and Ford 351 with Velvet Drive - Borg Warner brand inverter with 26 splines.
Features :
- 26 grooves
- External diameter: 330mm
- Inner diameter: 34mm
- Height: 32mm
More robust coupling replacing the old PCM assemblies on Ford bases.
26-spline coupling for Velvet Drive 71 - 72 type inverter - Paragon
Outer diameter: 157mm
Inner diameter: 34.5mm
Height: 21mm
6 springs
Can also be mounted on a Perkins base.
10-spline coupling with 6 springs.
Outer diameter: 157mm
Inner diameter: 29mm
Height: 30mm
6 springs
Multiple applications.
Coupling for Volvo Penta engine:
- 26 grooves
- Diameter 208mm
Volvo applications:
D2-50F, D2-55, D2-55B, D2-55C, D2-55D, D2-55E, D2-55F,
D2-75, D2-75B, D2-75C, D2-60F, D2-75F
Remember to replace the 6 screws: 60111167
Coupling for Yanmar 6LP series engine with 26 splines, 6 fixing screws and a ZF63A / HSW630 reverse gear.
PCM brand engine coupling with the following characteristics:
- 6 springs
- 26 grooves
- External diameter 33.5 cm
- Inner diameter 34 mm
Yanmar coupling diameter 170mm.
4 Springs
6 Mounting holes
20 Flutes
Coupling for Volvo Penta engines with 6 springs.
26 grooves
425 Nm of torque
Volvo Penta engine applications include:
AQ115A, AQ115B
AQ130A, AQ130B, AQ130C, AQ130D
BB115A, BB115B. BB115C
MB20A, MB20B, MB20C
230A, 230B
AQ125B
AQ145A
AQ145B, BB145A
250A, 250B
251A
AQ151A, AQ151C
AQ171A, AQ171C
AQ165A, BB165A
AQ170A, AQ170B, AQ170C, BB170A, BB170B, BB170C
AD30A, AQAD30A, MD30A, TAMD30A, TMD30A
AD31A, AD31B, AD31D, AD31XD, AQAD31A, MD31A
TAMD31A, TAMD31B, TAMD31D, TMD31A, TMD31B, TMD31D
KAD32P-A
AD40B, AQAD40B, AQD40A, AQD40A, MD40A
TAMD40A, TAMD40B, TMD40A, TMD40B, TMD40C
Round coupling for Mercruiser engine with Bravo type base.
Original Mercruiser OEM material.
26-spline coupling with 10 springs for Velvet drive series 71 - 72 and 73 applications.
Outer diameter: 350mm
Multiple applications and Detroit diesel GM53 series.
Single coupling for Mercruiser diesel engine with dual stage assembly included in kit 18311A10.
6-arm star coupling of the Centaflex type for mounting with HURTH - ZF inverter.
Mounting on 14 inch diameter 3/8 inch flywheel.
Features :
- 26 grooves
- Center distance 31.5 cm
- Height 45 mm
Reference on the inside: 021-61190-000
Mounting on Hurth or Velvet 5000 series inverter.
Engine applications: V6 4.3L - V8 305 - 350 - 454 and 502.
Centaflex type 6-arm star coupling for mounting with HURTH inverter.
Mounting for 14 inch diameter flywheel in M10.
Features :
- 26 grooves
- Center distance 31.5 cm
- Height 45 mm
Reference on the inside: 021-61442-000
Mounting for Borg Warner 5000 series inverter.
Crusader application: 6L - 7.4L and V8 8.1L.
Equipment not compatible with Mercruiser part number 862975A2.
Coupling for Yanmar engine with 10 splines, 6 fixing screws and a diameter of 276mm.
Yanmar 3JH and 4JH series application with SD50 - SD60 saildrive.