The Sealmaster NP-24 (Manufacturer Part Number 700189) is a standard-duty, two-bolt pillow block ball bearing unit designed by Regal Rexnord. It is widely used in heavy industrial manufacturing, conveying systems, and mechanical power transmission applications
Core Technical Specifications
- Bore Diameter: 1-1/2 inch (38.1 mm)
- Shaft Centerline Height: 1-15/16 inches (1.9375 in)
- Housing Material: Solid cast iron with powder-coated epoxy finish
- Locking Type: 120° spacing diamond-faceted set screw lock
- Bearing Insert Grade: 52100 high-carbon chrome steel with black oxide coating
- Load Capacities: 7,340 lbf dynamic radial load / 4,467 lbf static radial load
- Sealing Type: Felt labyrinth dual seals
- Total Weight: 5.7 lbs
Mounting Dimensions
- Overall Length: 7-1/4 inches (7.25 in)
- Overall Height: 3-15/16 inches (3.9375 in)
- Base Width: 2-1/8 inches (2.125 in)
- Bolt Spacing Center-to-Center: Slotted range from 4-7/8 inches minimum up to 5-7/8 inches maximum
- Compatible Bolt Size: 1/2 inch
Key Mechanical Features
- Zone Hardened Inner Ring: Hardens only the ball track area while keeping the set screw extension ductile to maintain strong holding power and resist cracking.
- Exclusive Pin & Dimple System: A lock pin prevents outer ring rotation within the housing, while a precise dimple alignment allows grease to flow smoothly through a direct lubrication path.
- Land-Riding Retainer: Patented design spaces rolling elements evenly, optimizing internal clearance and providing 360-degree grease circulation around the ball elements