As inboard engines scale up in horsepower, the mechanical demands placed on your running gear skyrocket. Shifting an offshore cruiser, tournament towboat, or commercial vessel from forward to hard reverse exerts tremendous force on your drive assembly. The Handi-Man Marine 1-1/4" Inboard Propeller Shaft Fastener Kit (MPN: 592054 / Industry Code: KW005) is engineered to absorb these extreme loads, acting as a crucial line of defense for your propeller.

This heavy-duty kit relies on a classic dual-nut wedging system to ensure absolute safety under the waterline. It features a heavy-pattern main shaft nut paired with a secondary, thinner "jam nut." When tightened securely against one another, the thread friction creates an immovable wedge lock that completely prevents the backing-off associated with high-RPM vibration.

Every item in this kit is manufactured from top-tier marine metals to prolong service life in harsh marine settings. The heavy-pattern nuts and 5/16" radius-cut key are machined from premium solid brass to provide smooth thread engagement and stop galvanic corrosion against a stainless steel shaft. A corrosion-free stainless steel cotter pin completes the kit, offering standard dual-redundant retention for true peace of mind at sea.

Key Features

• Dual-Nut Friction Retention: Features a primary heavy-pattern nut and a thin jam nut that compress together to eliminate back-off during aggressive shifting or reverse maneuvers.

• Corrosion-Resistant Marine Brass: Machined from high-tensile solid brass to prevent rust and completely eliminate cold-welding or thread binding on stainless steel shafts.

• All-In-One Drive Refresh: A complete replacement bundle containing both critical shaft nuts, a precision-sized radius woodruff key, and a marine-grade cotter pin.

• High-Torque Tolerance: Engineered with robust thread profiles designed to maintain their clamp load under heavy rotational vibration and high horsepower.

• Crucial Emergency Backup: Neatly packaged to serve as a perfect spare kit—an absolute must-have in your vessel's onboard tool locker next to your pullers and spare propeller.

Specifications