Overview
The Magnaloy Coupling Model 300 M30012012 is a premium-grade flexible drive coupling hub engineered for reliable power transmission in industrial machinery, pumps, motors, and mechanical drive systems. This coupling component features a 1-5/8″ bore with a 3/8″ keyway and is constructed from solid magnesium alloy, combining durability with minimal weight. Manufactured by Magnaloy Coupling Company (a division of Douville Johnston Corporation), this hub is a standard choice for OEM equipment and retrofit applications.
Key Features
- Lightweight Magnesium Construction: 76% lighter than cast iron, 36% lighter than aluminum, yet stronger than both materials
- Precision Machining: TIR (Total Indicated Runout) of ±0.002″ ensures vibration-free operation and easy alignment
- Standard Set-Screw Design: Single set-screw over keyway for secure shaft engagement; optional double set-screws available at 45° or 90°
- Corrosion Resistant: Magnesium alloy resists rust and oxidation in varied industrial environments
- Reduced Bearing Loads: Lower inertia and weight minimize stress on bearings, shafts, and connected equipment
- Heat-Treated Construction: Solid permanent mold castings deliver highest strength-to-weight ratio
Technical Specifications
- Bore Diameter: 1-5/8″ (1.625″)
- Keyway Size: 3/8″
- Outside Diameter: 3.45″
- Overall Length: 3.58″
- Material: Heat-treated magnesium alloy
- Finish: Standard magnesium (corrosion resistant)
- Set-Screw Configuration: Single set-screw over keyway (standard)
- Runout Tolerance: ±0.002″ TIR
Typical Applications
- Centrifugal and positive displacement pumps
- Electric motor-driven machinery and industrial gearboxes
- Fluid power and hydraulic systems
- Ventilation and HVAC equipment
- Compressors and air handling units
- General mechanical power transmission where lightweight, vibration-free operation is required
Compatibility & Replacements
Compatible With
- Magnaloy Model 300 coupling inserts and elastomer elements
- Standard AGMA semi-standard bore and keyway combinations
- Motors and equipment designed for 1-5/8″ diameter shafts
- Industrial transmission systems requiring flexible couplings
Replaces / Drop-In Replacement For
- OEM equipment originally equipped with Magnaloy Model 300 assemblies
- Worn or damaged 1-5/8″ x 3/8″ coupling hubs in existing systems
- Verify with your original equipment documentation or system integrator to confirm direct compatibility
Works With
- Magnaloy Model 300 grid couplings and insert packs
- Standard 3/8″ keyway shafting and fastening systems
- Optional double set-screw configurations (DSS45 or DSS90) available upon request
- Shaft coupling assemblies in pump, motor, and drivetrain applications
