Sealmaster NP-211 Mounted Cast Iron Two Bolt Pillow Block Ball Bearing Steel, Black Oxided - Setscrew Lock

Brand: Sealmaster (RRX)
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Regal Rexnord is a global leader in power transmission and motion control products, offering a broad portfolio that includes bearings, motors, gear drives, and automation solutions. Their innovations drive efficiency, reliability, and performance across industrial, commercial, and energy markets.

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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 Height (in) 5.00 in
Base Width (in) 2.38 in
Overall Width (in) 2.38 in
Overall Length (in) 8.63 in
Bolt Size (in) 5/8 in
Bore Diameter (mm) 55 mm
Base to Center Height (in) 2.5000 in
Foot Height (in) 0.75 in
Length Through Bore (in) 2.1875 in
Centerline to Outermost Bearing Face (in) 1.313 in
Bolt Spacing Max (in) 7 in
Bolt Spacing Min (in) 6.5 in

Technical Specifications

Housing Base Solid
Rolling Element Ball Bearing
Bore Shape Straight
Housing Construction One Piece
Housing Color Black
Outer Ring Land Profile Standard
Misalignment Type Static Only
Cage Material PPS - Polyphenylene Sulfide
Housing Type Pillow Block, Two Bolt
Seal Type Felt Labyrinth Seal
Housing Style Pillow Block
Ability to Relubricate Yes
Inner Race Heat Treat Method Zone-Hardened
Cage Type Land Riding Retainer
Grease Fitting Thread Size 1/8 NPT
Static Load Rating (lb) 6,601 lb
Bearing Type Standard Duty
Housing Coating Powder Coated
Fixed vs. Expansion Fixed
Vibration Frequency Inner Ring Defect 0.0987 cps
Shaft Locking Type Set Screw
Insert 5211
Inner Ring Outside Diameter (in) 2.719 in
Vibration Frequency Fundamental Train 0.0068 cps
Bearing Insert Finish Black Oxide
Vibration Frequency Roller Spin 0.0437 cps
Housing Material Cast Iron
Misalignment Capability ±2.0° Misalignment - Static Only
Radial Clearance Standard
End Cap Available No
Size Code 2-23
Maximum Speed (RPM) 3250 rpm
Dynamic Load Rating (lb) 9,752 lb
Lubricant Lithium Complex NLGI 2 Grease
Bearing Insert Material 52100 Bearing Steel
Base Length (in) 8.63 in
Max Operating Temperature (F) 220 °F
Vibration Frequency Outer Ring Defect 0.068 cps

General Specifications

UPC 662461051825
Weight 9.58 LB
Packaged Length 8.88 IN
Packaged Width 5.94 IN
Packaged Height 2.63 IN
HTC 8483.20.8040
Country of Origin United States of America

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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.