21630723 Hub Kit | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta Two-Blade Folding Propeller SAE 1-Inch Shaft Hub Kit - Part Number: 21630723

A genuine Volvo Penta two-blade folding-propeller shaft hub for a 1-inch shaft with a 1:16 SAE taper and 5/16-inch keyway.

The hub accepts matched Volvo Penta left- or right-hand folding blade kits and includes the blade pivot hardware, anode set and locking fluid required for assembly.

⚙️ Key Features

• Genuine Volvo Penta OEM folding-propeller hub kit

• Correct Volvo Penta part number 21630723

• Shaft specification: 1-inch shaft, 1:16 SAE taper, 5/16-inch keyway

• Compatible with matched left- or right-hand Volvo two-blade folding blade kits

• Includes pivot hardware, shaft-hub anode set and locking fluid

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 21630723 current Volvo Penta shaft-hub-kit reference

• 23974207 → Supersedes 3888491 for the related two-piece shaft-hub anode set

OEM / Related Numbers:

• 21630723

• 21626924 blade / shaft pin

• 23974207 current salt/brackish-water two-piece anode set

• 3888491 earlier two-piece anode-set reference

• shaft-specific nut

• shaft-specific locking washer

• 5/16-inch shaft key

Kit Contents:

• SAE 1-Inch Shaft folding-propeller hub assembly - part number 21630723 - quantity 1

• Blade / shaft pin - part number 21626924 - quantity 2

• Screw - part number 948000 - quantity 2

• Hex socket screw - part number 963675 - quantity 2

• Blade locking screw - part number 3595221 - quantity 2

• Two-piece sacrificial anode set - current Volvo service reference 23974207 - quantity 1 set; supersedes 3888491

• Thread-locking fluid 10ml - part number 23284156 - quantity 1

• Installation instructions - quantity 1; no separate part number

• shaft-specific nut, shaft-specific locking washer and 5/16-inch shaft key are separate and are not included

Aftermarket / Verified Equivalents:

• Aftermarket replacement anode sets are available for Volvo 23974207 / 3888491

• No complete aftermarket hub-kit equivalent

🚤 Compatibility

Commonly used on:

• Volvo Penta two-blade folding propellers on conventional propeller shafts

• Installations using a 1-inch shaft, 1:16 SAE taper and 5/16-inch keyway

• Low-drag auxiliary propulsion for sailing yachts

Typically suits:

• Engine / Drive models:

• Conventional shaft-drive installations matching 1-inch shaft, 1:16 SAE taper and 5/16-inch keyway

• Left-hand blade kits 21629132 / 21629140 / 21629147 / 21629158 / 21629173 / 21629182 / 21629190 / 21629198 / 21629205 / 21629214

• Right-hand blade kits 21629136 / 21629144 / 21629152 / 21629167 / 21629177 / 21629186 / 21629194 / 21629201 / 21629211 / 21629218

• MD1B / MD2B / MD3B shaft-drive installations within the approved power range

• MD5A / MD5B / MD5C

• MD6A / MD6B

• MD7A / MD7B

• MD11C / MD11D

• MD17C / MD17D

• 2001 / 2001B / 2001D

• 2002 / 2002B / 2002D

• 2003 / 2003B / 2003D

• MD2010

• MD2020

• MD2030

• MD2040

• D1-13 / D1-13F

• D1-20 / D1-20F

• D1-30 / D1-30F

• D2-40 / D2-40B / D2-40F

• Shaft Fitment Notes:

• Required shaft: 1-inch shaft.

• Required taper: 1:16 SAE taper.

• Required keyway: 5/16-inch keyway.

• Confirm shaft dimensions by measurement; a visually similar hub with another taper or keyway will not seat correctly.

• HP Range: Approximately 5HP-40HP

• Engine / Drive Type: Volvo Penta sailing auxiliary engine with conventional shaft drive

• Year Range: Approximately 1970s onward; shaft dimensions and propeller sizing control final fitment

🔌 Function

The hub mounts the folding blades to the propeller shaft, transfers engine torque and provides the blade pivots, stops and sacrificial-anode protection required by the folding-propeller system.

Common signs of failure or incorrect fitment:

• Hub does not seat fully on the shaft taper

• Keyway, shaft key or propeller nut damaged

• Excessive blade movement at the pivot pins

• Hub corrosion or depleted sacrificial anode

• Propeller vibration or movement caused by incorrect machining or shaft dimensions

📦 Condition

• Genuine Volvo Penta part

• Brand new

• Supplied in original or equivalent packaging