Overview
The Sealmaster SFT-12 is a standard-duty mounted ball bearing unit designed for direct flange mounting in pump, motor, and machinery applications. This SFT-12 features a non-expansion (fixed) design with a 0.75″ straight bore, two-bolt mounting configuration, and cast iron housing with black oxide coating. The bearing insert is constructed of 52100 bearing steel with zone-hardened inner race, offering reliable performance across general industrial use.
Key Features
- 0.75″ straight bore with setscrew locking mechanism for secure shaft coupling
- Cast iron housing with black oxide finish; designed for flush mounting
- 52100 bearing steel with zone-hardened inner race for extended service life
- Non-expansion (fixed) design with ±2.0° static-only misalignment capacity
- Felt labyrinth seal with flinger protection for contamination resistance
- Relubricatable with lithium complex NLGI #2 grease; permits periodic re-greasing
Technical Specifications
- Bore Diameter: 3/4 inch (0.75″)
- Bore Type: Straight, cylindrical
- Housing Material: Cast iron
- Housing Finish: Black oxide coated
- Bearing Insert Material: 52100 bearing steel, zone hardened
- Bearing Type: Radial ball (standard duty)
- Mounting Style: 2-bolt flange (back-side mounting)
- Shaft Locking: Setscrew lock with diamond faceted setscrews
- Expansion Type: Non-expansion (fixed)
- Seal Type: Felt labyrinth with flinger
- Lubricant: Lithium complex NLGI #2 equivalent
- Maximum Speed: 7,300 RPM
- Operating Temperature Range: -20°F to +220°F
- Bolt Center-to-Center Distance: 3.531 inches
- Mount Hole Center-to-Center Height: 3 17/32 inches
- Overall Length: 4.406 inches
- Housing Width: 1 9/32 inches
- Static Misalignment: ±2.0° (fixed design)
- Weight: 1.22 lbs
- Brand: Sealmaster (Regal Rexnord)
Typical Applications
The Sealmaster SFT-12 is widely used in:
- Centrifugal pump applications requiring reliable, long-term bearing support
- Electric motor and mechanical drive mounting where space and load are moderate
- Conveyor systems, fans, and blowers operating under steady conditions
- General industrial machinery where standard-duty performance suffices
- OEM equipment replacement to maintain original specifications and compatibility
Compatibility & Replacements
Compatible With
- Pump discharge flanges and motor foot-mounted bases with 2-bolt mounting pattern
- Shaft diameters up to 0.75″ nominal bore
- Standard industrial lubrication schedules using NLGI #2 lithium grease
- Fixed-misalignment applications (up to ±2.0° static)
Replaces / Drop-In Replacement For
- Sealmaster SFT-12 bearing units (standard, interchangeable across stock lots)
- Standard equivalent bearings with matching bore, flange bolt pattern, and mounting height
- Original equipment manufacturer (OEM) flange-mount ball bearing specifications calling for 0.75″ bore, 2-bolt configuration
Works With
- Setscrew-locking shaft coupling systems
- Cast iron or steel machinery housings with machined flange surfaces
- Standard industrial grease fittings and zerk nipple lubrication
- Shaft materials including carbon steel, stainless steel, and alloy steel
