

Sealmaster NP-31 Mounted Cast Iron Two Bolt Pillow Block Ball Bearing Steel, Black Oxided - Setscrew Lock
- Regular price
- $321.00
- Sale price
- $321.00
- Regular price
-
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Key Features
- Powder coated epoxy cast iron housing with extended inner ring bearings
- Zone hardened inner ring with 120° spacing setscrew locking with diamond faceted setscrews
- Unique land riding retainer design provides superior pocket clearance that allows for 360° grease circulation around the rolling elements resulting in better retained and utilized lubrication.
- Sealmaster® exclusive lock pin and dimple for direct lubrication and anti-rotation
Description
The Sealmaster Mounted Cast Iron Two Bolt Pillow Block Ball Bearing is a robust, ready-to-mount bearing unit designed for reliable performance in normal to medium-duty applications. Featuring a solid one-piece cast iron housing, this pillow block ensures maximum strength and rigidity. The bearing insert, crafted from 52100 bearing steel with a black oxide coating, provides excellent corrosion resistance and durability. It utilizes a setscrew locking collar or Sealmaster’s exclusive Skwezloc® concentric locking collar for secure shaft attachment, minimizing slippage. The unit includes felt seals to protect against contaminants and retain lubrication, with a relubricatable design for extended bearing life. The two-bolt base allows for straightforward installation, supporting radial or radial-and-thrust loads. With a wide range of bore sizes and configurations, this bearing is ideal for applications such as conveyors, industrial machinery, and material handling systems. Sealmaster’s innovative features, like the lock pin and dimple system, enable direct lubrication and prevent outer ring rotation, ensuring optimal performance and reduced maintenance.
Specifications
Dimensions
Overall Width (in) | 2.38 in |
Base Width (in) | 2.38 in |
Overall Height (in) | 4.56 in |
Overall Length (in) | 8.13 in |
Bolt Size (in) | 5/8 in |
Bore Diameter (in) | 1.9375 in |
Foot Height (in) | 0.75 in |
Base to Center Height (in) | 2.2500 in |
Length Through Bore (in) | 2.031 in |
Bolt Spacing Min (in) | 6 in |
Centerline to Outermost Bearing Face (in) | 1.281 in |
Bolt Spacing Max (in) | 6.5 in |
Technical Specifications
Housing Base | Solid |
Rolling Element | Ball Bearing |
Bore Shape | Straight |
Housing Construction | One Piece |
Housing Color | Black |
Misalignment Type | Static Only |
Outer Ring Land Profile | Standard |
Cage Material | PPS - Polyphenylene Sulfide |
Seal Type | Felt Labyrinth Seal |
Housing Type | Pillow Block, Two Bolt |
Housing Style | Pillow Block |
Ability to Relubricate | Yes |
Inner Race Heat Treat Method | Zone-Hardened |
Static Load Rating (lb) | 5,216 lb |
Bearing Insert Finish | Black Oxide |
Cage Type | Land Riding Retainer |
Vibration Frequency Outer Ring Defect | 0.0683 cps |
Inner Ring Outside Diameter (in) | 2.469 in |
Fixed vs. Expansion | Fixed |
Vibration Frequency Inner Ring Defect | 0.0984 cps |
Maximum Speed (RPM) | 3550 rpm |
Dynamic Load Rating (lb) | 7,889 lb |
Bearing Insert Material | 52100 Bearing Steel |
Housing Coating | Powder Coated |
End Cap Available | No |
Size Code | 2-115 |
Max Operating Temperature (F) | 220 °F |
Bearing Type | Standard Duty |
Misalignment Capability | ±2.0° Misalignment - Static Only |
Grease Fitting Thread Size | 1/8 NPT |
Housing Material | Cast Iron |
Radial Clearance | Standard |
Insert | 2-115 |
Base Length (in) | 8.13 in |
Vibration Frequency Roller Spin | 0.0445 cps |
Vibration Frequency Fundamental Train | 0.0068 cps |
Lubricant | Lithium Complex NLGI 2 Grease |
Shaft Locking Type | Set Screw |
General Specifications
UPC | 662461001721 |
Weight | 8.17 LB |
Packaged Length | 9.00 IN |
Packaged Width | 5.19 IN |
Packaged Height | 2.38 IN |
HTC | 8483.20.8040 |
Country of Origin | Mexico |
Manuals
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Disclaimer: Apollo Industries is not an authorized distributor, reseller, or representative of Regal Rexnord Corporation. All Regal Rexnord Corporation trademarks and product names are the property of their respective owners. We sell genuine Regal Rexnord Corporation products purchased through independent channels.