Overview
The Miether SAF-522 is an industrial-grade split pillow block bearing housing engineered for heavy-duty motion control and rotating shaft support. This 4-inch bore cast iron housing accommodates spherical roller bearings and self-aligning ball bearings, making it a standard component in machinery ranging from large conveyor systems to mill drives. The split construction facilitates quick installation and maintenance without removing the rotating shaft or outer bearing components.
Key Features
- Split pillow block design for tool-free bearing installation and removal
- Cast iron construction with reinforced webbed base for load distribution and rigidity
- Four-bolt base mounting for secure floor or structural attachment
- Compatible with both spherical roller and self-aligning ball bearings
- Dual grease fittings and drain plugs for simple lubrication and maintenance
- Uncoated finish; suitable for wash-down and corrosive environments when protected
Technical Specifications
- Housing Type: Split Pillow Block (Plummer Block)
- Bore Diameter: 4.0000 inches
- Overall Length (OAL): 16.5 inches
- Overall Height (OAH): 9.625 inches
- Overall Width (OAW): 6.5 inches
- Base to Bore Centerline: 4.9375 inches
- Mounting Type: Four-Bolt Base
- Bolt Center-to-Center Length: 1.7813 inches
- Base Width: 4.75 inches
- Housing Material: Cast Iron (ASTM A48 Grade 35)
- Weight: 52.91 pounds
- Seals Included: (2) LOR 109 Aluminum Labyrinth Triple Seal Rings
Typical Applications
The Miether SAF-522 is engineered for demanding industrial environments requiring continuous high-load bearing support:
- Steel mill rolling stands and drive systems
- Large conveyor systems (horizontal and inclined)
- Quarry and mining equipment
- Heavy-duty motor and gearbox mounting
- Industrial fan and pump shaft support
- Pulp and paper processing machinery
Compatibility & Replacements
Compatible With
- Spherical roller bearings (SKF 22222 EK, SKF 1222 K, SKF C2222 EK series)
- Self-aligning ball bearings (various standard bore diameters)
- Standard 4-inch shaft applications
- Industrial mounting systems requiring four-bolt base installation
Replaces / Drop-In Replacement For
- SKF SAF 522
- Timken SAF 522
- FAG SAF522X0315U
- Other SAF 522 series pillow block housings (verify bore and mounting compatibility)
Works With
- SKF, Timken, FAG, and NSK spherical roller and ball bearing components
- Standard industrial lubrication systems (grease and oil)
- ISO-standard four-bolt mounting configurations
- Shaft coupling and pulley assemblies rated for 4-inch bores
