21827366 Shaft Coupling | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta two-piece rigid propeller shaft coupling for a 30 mm shaft, 63 mm long with a 102 mm flange diameter and weighing 3.242 kg. It shares its length and flange diameter with the 25 mm coupling 21827365, so shaft bore is the only thing that separates them. The two-piece conic design centres itself on the shaft and needs no tapering or keyway cutting: the shaft is cut to length, the cone fitted, and the coupling bolted to the flange. The catalogue gives the material as high grade 1018 steel to ISO E 235 with a zinc-nickel coating and sealer, and the required shaft tolerance as h9, plus 0.0 to minus 0.052.

⚙️ Key Features

• For a 30 mm propeller shaft
• 63 mm long, 102 mm flange diameter
• Two-piece self-centring conic design, no shaft machining required
• High grade 1018 steel to ISO E 235, zinc-nickel coated and sealed
• Shaft must be to h9 tolerance, plus 0.0 to minus 0.052
• Supplied with bolts, nuts, washers and instructions
• Simplified installation and alignment
• Less vibration and noise
• No machining required
• Two-piece conic design
• Perfect central alignment
• High torsional hold without shaft damage
• Compact dimensions, low weight
• Virtually maintenance free
• Easy to disconnect the propeller shaft, without re-adjustment
• Integrated counterhold
• Better onboard comfort
• Flange diameter d: 102 mm (4.02 in)
• Length l: 63 mm (2.48 in)
• Material: high grade 1018 steel (ISO E 235) with zinc-nickel coating and sealer
• Required shaft tolerance: h9 (+0.0 -0.052)
• Shaft diameter: 30 mm
• Weight: 3.0 kg (6.6 lb)
• Fits: D1 with MS10 or MS15 gearbox; D2-40 with MS10 or MS15; D2-55 / D2-75 with MS25

📋 Kit Contents

• 1 × two-piece conical 30 mm shaft coupling assembly - 21827366
• Coupling bolts - supplied within assembly 21827366; no separate component number published
• Coupling nuts - supplied within assembly 21827366; no separate component number published
• Coupling washers - supplied within assembly 21827366; no separate component number published
• Installation instructions - supplied with assembly 21827366

🔌 Function

Clamps the 30 mm propeller shaft concentrically to the gearbox output flange, carrying drive torque and propeller thrust between them.

⚠️ Common Signs of Failure

• Vibration through the hull that follows shaft speed
• Coupling creeping along the shaft or running out of true
• Corrosion or fretting at the shaft interface
• Rust weeping from the clamped joint
• Clamping faces scored or picked up on removal

🛠️ Service Notes

• This coupling and the 25 mm 21827365 share the same 63 mm length and 102 mm flange and are 17 grams apart, so measure the shaft rather than comparing the parts
• The shaft must be to h9 tolerance and true where the cone grips
• The design lets the propeller shaft be disconnected again without re-adjustment, which is worth knowing before you cut the shaft to length
• Required shaft tolerance is h9 (+0.0 -0.052)
• Cut the shaft to length and fit the cone - no tapering or keyway cutting is needed

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21827366 → Supersedes 827927 → Supersedes 827928

OEM / Related Numbers

• 827927 earlier number superseded by this part
• 827928 earlier number superseded by this part

📦 Condition

• Genuine Volvo Penta part
• Brand new
• Supplied in original or equivalent packaging