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R22 Open Inch Series Deep Groove Ball Bearing For High-Speed Motor | 34.925 × 63.5 × 11.112 mm

R22 Open Inch Series Deep Groove Ball Bearing For High-Speed Motor | 34.925 × 63.5 × 11.112 mm

The R22 is the base open configuration of the R-series inch-dimensioned Conrad-type ball bearing, offered without shields or seals for applications where lubrication access, higher operating speeds, or field-selectable lubricants take priority over self-contained contamination protection. With a 1-3/8" (34.925 mm) bore, 2-1/2" (63.5 mm) outer diameter, and 7/16" (11.112 mm) width — notably slimmer than the shielded R22-ZZ or sealed R22-2RS variants — the open design is the preferred fit for enclosed gearboxes, oil-bath housings, clean-environment motor shafts, and any application where lubrication is managed externally by the machine's own system. It ships without grease and accepts both oil and grease lubrication, giving maintenance engineers full control over lubricant type and repack intervals.

R22 Deep Groove Ball Bearing 34.925 × 63.5 × 11.112 mm | R Series (Inch) | Unshielded / Open Design

The unshielded R22 is a single-row Conrad-type ball bearing built to ABMA R-series inch standards, designed for high-speed and lubrication-managed environments. Its open raceway accepts external lubrication from a housing oil bath, centralized grease system, or maintenance repack schedule — making it a natural choice for precision motor applications, gearbox assemblies, and enclosed industrial drives where the housing itself handles contamination control. The open design also allows the bearing to run at higher limiting speeds than any sealed or shielded R22 variant, and gives engineers the freedom to specify lubricants matched to operating temperature, load, and speed requirements rather than relying on factory-applied grease.

R22 Open Inch Series Deep Groove Ball Bearing For High-Speed Motor | 34.925 × 63.5 × 11.112 mm

Comprehensive Applications

Well-suited for clean or enclosed machinery where lubrication is managed at the housing level:

High-Speed Motor & Spindle Applications
  • Industrial AC and DC motor shaft bearings
  • Milling machine and lathe spindle supports
  • High-speed conveyor drive motor heads
  • Blower and fan motor shaft positions
Enclosed Gearboxes & Oil-Bath Housings
  • Gearbox input and output shaft supports
  • Speed reducer auxiliary bearing positions
  • Ship rudder shaft gearboxes
  • Multi-stage industrial gearbox assemblies
Precision Drives & Automation
  • CNC machine tool auxiliary bearings
  • Packaging line servo drive supports
  • Robotics joint drive supports
  • Textile machinery precision drive shafts
General Industrial & Power Transmission
  • Motorcycle and automotive auxiliary shafts
  • Pulley and belt drive end supports
  • Power tool gear housings with oil fill
  • Aggregate crusher drive auxiliary bearings

Key Performance Features

01. Higher Speed Capability Than Sealed or Shielded Variant

Without the drag of contact rubber seals or the turbulence introduced by pressed-steel shields, the R22 open bearing reaches a grease limiting speed of 13,000 r/min and an oil limiting speed of 15,000 r/min — meaningfully higher than the R22-2RS sealed configuration. For motor shaft or spindle applications where running speed is a primary design constraint, the open bearing delivers the best rotational performance within the R22 family.

02. Narrower Width for Space-Constrained Housing

At 7/16" (11.112 mm) wide, the R22 Open is approximately 3.2 mm narrower than the R22-ZZ and R22-2RS variants. This dimensional difference matters in housings designed around the open-style width, where fitting a shielded or sealed bearing would require housing modification or a spacer. When replacing open bearings in OEM equipment, always verify the width specification before substituting with a shielded or sealed variant.

03. Full Lubrication Flexibility — Grease or Oil

The open raceway accepts any compatible grease or oil, allowing engineers to select lubricants optimized for their specific operating conditions — high-temperature synthetic greases, low-viscosity spindle oils, extreme-pressure gear oils, or food-grade lubricants for relevant industries. This stands in contrast to pre-greased sealed variants, where the factory lubricant cannot be changed or supplemented without destroying the seal.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series R Series (Inch / ABMA Standard)
Basic Designation R22
Suffix Open / Unshielded
Bore Diameter (d) 1-3/8 in / 34.925 mm
Outer Diameter (D) 2-1/2 in / 63.5 mm
Width (B) 9/16 in / 14.288 mm
Material (Races & Balls) Chrome Steel (GCr15 / SAE 52100)
Precision Class Standard / P5 Grade Available
Cage Material Pressed Steel
Dynamic Load Rating (Cʳ) ≈ 16.0 kN
Static Load Rating (C₀ʳ) ≈ 10.4 kN
Limiting Speed (Grease) 13,000 r/min
Limiting Speed (Oil) 15,000 r/min
Weight (approx.) 0.122 kg

Interchange Part Numbers

Common cross-reference designations:

  • NSK-RHP: KLNJ 1-3/8
  • Peer Bearing: 77R22
  • Generic / Industry: R22, R22 Open

Design & Configuration

The R22 is a Conrad-type single-row radial ball bearing — meaning the balls are inserted through a filling slot and retained by a pressed-steel cage, allowing the bearing to carry both radial loads and moderate bidirectional axial loads. Supplied without seals or shields, it must be installed in a housing that provides its own contamination protection, whether through labyrinth seals, lip seals, close-clearance covers, or an enclosed oil bath. For applications in open or contaminated environments, the R22-ZZ (double metal shield) or R22-2RS (double rubber seal) are the appropriate variants. C3 internal clearance is available where elevated operating temperatures or interference fits are expected; ABEC-3 precision grade can be specified for reduced noise and tighter running accuracy.

"For motor shafts, gearbox assemblies, and precision drives operating in clean or enclosed housings, the R22 open bearing delivers the R-series' highest speed capability alongside full lubrication flexibility. Its unshielded design is the go-to selection when engineers need to match the lubricant to the application rather than accept a factory-packed solution — and its narrower open-style width makes it the correct choice wherever housing geometry demands the 7/16" profile."

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