Description
Mercury 840383A2 Propeller Nut Kit for HD 1.25 in Prop Shaft
The Mercury 840383A2 Propeller Nut Kit is designed for heavy-duty 1.25-inch propeller shaft applications on select Mercury and MerCruiser high-performance gearcases and sterndrives. This kit is used with Mercury Sport Master, Torque Master I and II, Fleet Master, Verado 5.25-inch gearcases, and select MerCruiser Bravo I XR and XZ sterndrive applications where this propeller hardware is specified.
Key Features
- Mercury propeller nut kit
- Part number: 840383A2
- Designed for HD / heavy-duty 1.25-inch propeller shaft applications
- Fits select Mercury Sport Master, Torque Master I, Torque Master II, Fleet Master, and Verado 5.25-inch gearcases
- Fits select MerCruiser Bravo I XR and XZ sterndrives
- Also used on Sport Master and shorty Sport Master Bravo I XR Sport sterndrives
- Propeller nut torque specification: 55 ft-lb / 75 Nm
- Used for propeller installation and propeller hardware replacement
- Best matched by gearcase, drive model, prop shaft diameter, hub system, thrust washer, and propeller nut requirement
Fitment / Product Details
- Brand: Mercury
- Part Number: 840383A2
- Product Type: Propeller nut kit / propeller hardware kit
- Application: Heavy-duty propeller nut kit for select Mercury and MerCruiser gearcase and sterndrive applications
- Engine / Drive Types: Mercury Sport Master, Torque Master I, Torque Master II, Fleet Master, Verado 5.25-inch gearcase, MerCruiser Bravo I XR, Bravo I XZ, Sport Master, and shorty Sport Master Bravo I XR Sport sterndrive applications
- HP Range: Application-specific; match by gearcase, drive model, prop shaft diameter, hub system, and propeller hardware requirement
- Prop Shaft Diameter: 1.25 in heavy-duty propeller shaft
- Gearcase Applications: Mercury Sport Master, Torque Master I, Torque Master II, Fleet Master, and Verado 5.25 in diameter gearcase
- Sterndrive Applications: MerCruiser Bravo I XR, Bravo I XZ, Sport Master, and shorty Sport Master Bravo I XR Sport sterndrives
- Torque Specification: 55 ft-lb / 75 Nm
- Assembly Location: Propeller shaft / propeller hardware assembly
- Fitment Note: Match part number 840383A2 to your engine or drive model, gearcase type, 1.25-inch prop shaft diameter, Flo-Torq hub, thrust washer, propeller nut requirement, and owner’s manual before ordering.
What’s Included
- Propeller nut kit components for compatible HD 1.25-inch prop shaft applications
Expanded Fitment
- Mercury Sport Master Gearcase: Use with HD 1.25-inch propeller shaft applications where 840383A2 is specified
- Mercury Torque Master I Gearcase: Use with compatible HD 1.25-inch propeller shaft applications
- Mercury Torque Master II Gearcase: Use with compatible HD 1.25-inch propeller shaft applications
- Mercury Fleet Master Gearcase: Use where the 1.25-inch heavy-duty prop shaft and 840383A2 kit are specified
- Mercury Verado 5.25 in Gearcase: Use with compatible HD 1.25-inch propeller shaft applications
- MerCruiser Bravo I XR Sterndrive: Use where propeller nut kit 840383A2 is specified
- MerCruiser Bravo I XZ Sterndrive: Use where propeller nut kit 840383A2 is specified
- Sport Master Bravo I XR Sport Sterndrive: Use with compatible Sport Master and shorty Sport Master applications
Why You Should Buy
- Correct Mercury propeller nut kit for applications requiring 840383A2
- Designed specifically for heavy-duty 1.25-inch propeller shaft applications
- Supports secure propeller installation on compatible high-performance Mercury and MerCruiser gearcases
- Useful for propeller service, propeller replacement, missing hardware replacement, and hub system maintenance
- Clear 55 ft-lb / 75 Nm torque specification helps support proper installation
- Best selected by exact part number, prop shaft diameter, gearcase type, drive model, and owner’s manual application
Common Applications
- Mercury Sport Master propeller nut replacement
- Mercury Torque Master I and II propeller hardware service
- Mercury Fleet Master propeller nut kit replacement
- Mercury Verado 5.25-inch gearcase propeller hardware service
- MerCruiser Bravo I XR propeller nut replacement
- MerCruiser Bravo I XZ propeller hardware service
- Shorty Sport Master Bravo I XR Sport sterndrive propeller hardware replacement
- Applications requiring Mercury 840383A2
FAQ
- What is Mercury 840383A2? Mercury 840383A2 is a propeller nut kit for select heavy-duty 1.25-inch propeller shaft applications.
- What prop shaft diameter does this kit fit? This kit is for HD / heavy-duty 1.25-inch propeller shaft applications.
- What gearcases does this fit? This kit is used on Mercury Sport Master, Torque Master I and II, Fleet Master, and Verado 5.25-inch gearcase applications where specified.
- Does this fit MerCruiser sterndrives? Yes. It is used on select MerCruiser Bravo I XR and XZ sterndrives, plus Sport Master and shorty Sport Master Bravo I XR Sport sterndrives.
- What is the propeller nut torque specification? Torque the propeller nut to 55 ft-lb / 75 Nm.
- Is this the same as the 1-inch prop shaft nut kit? No. This kit is for HD 1.25-inch propeller shaft applications. Confirm your prop shaft diameter before ordering.
- Do I need to check the hub and thrust washer? Yes. See your owner’s manual for the Flo-Torq hub, thrust washer, and propeller nut part numbers that best fit your engine or drive.
- How should I confirm fitment? Match part number 840383A2 to your engine or drive model, gearcase type, 1.25-inch prop shaft diameter, Flo-Torq hub, thrust washer, propeller nut requirement, and owner’s manual before ordering.