MasterGuard Hub Installation Kit 508 4.25″ & 4.75″ Gearcase

MasterGuard Hub Installation Kit 508 4.25″ & 4.75″ Gearcase

The MasterGuard 508 is a premium hub installation kit designed for select outboards and sterndrives with 4.25″ or 4.75″ gearcases. It provides the mechanical interface between your propeller housing and your engines driveshaft and its the only hub kit in its class backed by a lifetime warranty for consumer use.

Compatible with Turning Point Express Mach3, Mach3 OS, Mach4, and Hustler propeller housings, as well as popular third-party housings including Solas Rubex, Michigan Wheel XHS, and Mercury FloTorq. Always verify your specific engine make, model, and year against the application chart to confirm the correct kit number before ordering.

Key Features

• One-Piece Construction: Marine bronze splines over-molded with glass-filled nylon eliminating the failure points common in multi-part sleeve-and-spline or pressed-rubber hub designs.
• Shock-Absorbing Cushion: High-tech polymer absorbs gear shock and helps protect the lower unit from impact damage.
• Reusable After a Prop Strike: In most cases the hub can be reused after a strike. If it cant, its covered under warranty.
• Corrosion Resistant: Premium marine bronze splines resist corrosion in both saltwater and freshwater environments.
• Easy Installation: Kit includes hub, thrust washer, and all required hardware with clear step-by-step instructions.
• Lifetime Warranty: Covers engines under 200hp with aluminum or stainless steel props, and engines 200hp+ with aluminum props. Consumer use only.

Specifications

• Kit Number: 508 (11500800)
• Gearcase Fit: 4.25″ and 4.75″
• Compatible Prop Housings: Express Mach3, Mach3 OS, Mach4, Hustler; also fits Solas Rubex, Michigan Wheel XHS, Mercury FloTorq
• Hub Material: Marine bronze splines with glass-filled nylon over-mold
• Kit Contents: Hub, thrust washer, and installation hardware

Compatible Engine Brands

Evinrude, Honda, Johnson, Mariner, Mercury, MerCruiser, Nissan, OMC, Parsun, Suzuki, Tohatsu, Yamaha outboards and sterndrives. Always verify your specific engine make, model, and year against the application chart before ordering.

Compatible Propellers (Sold Separately)

• Express Mach3 13.25×19 3-Blade Stainless Steel Propeller
• Express Mach4 13×19 4-Blade Stainless Steel Propeller
• Hustler 14×11 3-Blade Aluminum Propeller
• Hustler 14×13 3-Blade Aluminum Propeller
• Hustler 14×11 4-Blade Aluminum Propeller
• Hustler 14×13 4-Blade Aluminum Propeller

Other MasterGuard Hub Kits 500 Series

• MasterGuard Hub Installation Kit 503 4.25″ & 4.75″ Gearcase
• MasterGuard Hub Installation Kit 504 4.25″ & 4.75″ Gearcase
• MasterGuard Hub Installation Kit 505 4.25″ & 4.75″ Gearcase
• MasterGuard Hub Installation Kit 506 4.25″ & 4.75″ Gearcase
• MasterGuard Hub Installation Kit 507 4.25″ & 4.75″ Gearcase
• MasterGuard Hub Installation Kit Model 26
• MasterGuard Hub Installation Kit Model 28
• MasterGuard Hub Installation Kit Model 11

Parts Desk Insights

Best Use Case: The 508 kit covers the same 4.25″ and 4.75″ gearcase range as the 503, 504, 505, 506, and 507, but is engine-specific the correct kit number is determined by the customers exact engine make, model, and year. Do not substitute any 500-series kit for another without verifying against the application chart. All six are appropriate for higher-horsepower outboards and sterndrives (typically 75hp and above) running Express or Hustler propeller housings on larger gearcases.

Hub Kit vs. Propeller: This kit is the hub only the propeller housing is sold separately. Customers replacing a damaged prop only need to purchase a new housing, not a new hub, which can significantly reduce replacement cost.

Cross-Brand Compatibility: This hub also fits Solas Rubex, Michigan Wheel XHS, and Mercury FloTorq housings useful when a customer already has a non-Turning Point prop and wants to upgrade to the MasterGuard hub system for better lower-unit protection.

Warranty Note: The lifetime warranty applies to consumer use only and excludes extreme commercial applications. Direct customers to the manufacturers warranty page for full terms.