Your boat's drivetrain is subjected to immense torsional loads, shifting stresses, and continuous vibrations under the waterline. If your propeller hardware slips or fails, the results are catastrophic. The Handi-Man Marine 1" Inboard Propeller Shaft Fastener Kit (MPN: 592034) is purpose-built to provide an unyielding mechanical lock, acting as the ultimate safeguard for your vessel's propulsion system.

This comprehensive kit utilizes a traditional dual-nut locking assembly to provide maximum holding power. It features a heavy pattern full-size shaft nut paired with a thinner "jam nut." When tightened correctly against each other, the jam nut acts as a physical wedge that locks the main nut in place, preventing the assembly from spinning loose during sudden reverse shifts or high-RPM operation.

Every component is constructed from premium-grade marine materials. The heavy-pattern nuts and radius-cut key are machined from corrosion-resistant solid brass to eliminate galvanic reaction with stainless steel shafts, while the included cotter pin is formed from 316 marine-grade stainless steel to prevent rust and corrosion in harsh marine environments.

Key Features

• Dual Jam Nut Defense: Features a full-size nut and a specialized thin jam nut that lock together via friction to keep the propeller perfectly secure under heavy loads.

• Premium Marine Brass Hardware: Components are crafted from high-grade brass to ensure smooth thread engagement and excellent resistance against galvanic saltwater corrosion.

• Complete Replacement Assembly: Convenient all-in-one kit includes both critical shaft nuts, the correctly sized radius key, and a marine-grade cotter pin to refresh your entire running gear connection.

• Vibration-Resistant Seating: Tight thread tolerances keep the bolted joint from backing off or loosening over long seasons of continuous vibration.

• Essential Vessel Spare: Packaged neatly as a perfect emergency backup kit—an absolute must-have in your onboard tool locker alongside your spare propeller.

Specifications