Overview
The Sealmaster MSF-56 is a non-expansion, medium-duty mounted ball bearing designed for demanding industrial applications. With a 3-1/2″ bore and 4-bolt flange configuration, this unit provides robust shaft support with cast iron housing and proven reliability in moderate to high radial load environments.
Key Features
- Cast iron housing with epoxy powder coating for durability and corrosion resistance
- Black oxide treated 52100 chrome steel bearing insert for extended service life
- Felt labyrinth seals with flinger design to keep lubricant in and contaminants out
- Setscrew locking collar with zone-hardened inner ring and 120° spacing for secure shaft mounting
- Exclusive lock pin and dimple system for direct lubrication path and anti-rotation protection
- Wide inner race with land riding metallic retainer for 360° grease circulation
- Regreasable—grease fitting on housing for field maintenance
Technical Specifications
- Bore Diameter: 3-1/2″ (88.9 mm)
- Flange Type: 4-Bolt Flange Mount
- Housing Material: Cast Iron, Epoxy Powder Coated
- Bearing Insert: Black Oxide Treated 52100 Chrome Steel
- Seal Type: Felt Labyrinth with Flinger
- Locking Mechanism: Setscrew Locking Collar
- Overall Length: 8-7/16″ (213.7 mm)
- Bolt Center-to-Center Length: 6-3/4″ (171.5 mm)
- Operating Temperature Range: -20°F to +220°F (-29°C to +104°C)
- Duty Rating: Medium Duty
- Lubrication: Regreasable with GoldPlex®HP grease
- Series: MSF (Non-Expansion Medium Duty)
Typical Applications
The Sealmaster MSF-56 is widely used in:
- Industrial machinery and equipment requiring flange-mounted shaft support
- Conveyor systems and material handling equipment
- Agricultural machinery with moderate to high radial loading
- Motor and pump drive shafts
- Gearbox and transmission support bearings
- Production line equipment requiring field regreasing capability
Compatibility & Replacements
Compatible With
- Shafts with 3-1/2″ diameter nominal sizing
- Equipment using 4-bolt flange mounting patterns
- Systems designed for GoldPlex®HP or equivalent industrial ball bearing grease
- Standard industrial machinery frames and foundations
Replaces / Drop-In Replacement For
- OEM part numbers: 701967 (Sealmaster catalog reference)
- Direct replacement for worn or failed MSF-56 units in existing installations
- Compatible with legacy equipment using equivalent 3-1/2″ 4-bolt flange bearing housings
Works With
- Standard industrial bearing mounting systems and frames
- Mechanical power transmission equipment (pulleys, couplings, gearboxes)
- Industrial lubrication systems using NLGI Grade 2 and Grade 3 greases
- Field maintenance teams using hand grease guns and standard relubrication schedules
