MR148-ZZ Deep Groove Ball Bearing For Compact Motors & Precision Mechanisms | 8×14×4 mm

The MR148-ZZ is a Robust Miniature Deep Groove Ball Bearing engineered for applications that require dependable performance with enhanced protection from contaminants. Featuring dual steel shields (ZZ) on both sides, this metric bearing provides a solid barrier against dust and airborne particles, helping to retain internal lubrication and promote smooth, extended service life. With an 8mm bore, it is well-suited for integration into small electromechanical systems, precision equipment, and motor assemblies where space efficiency and reliable sealing are key priorities.



MR148 ZZ Deep Groove Ball Bearing 8×14×4 mm | ISO 68 Series – Extra Light | Double Shielded

Featuring a versatile deep groove raceway, this bearing is engineered for reliable, high-speed performance up to 32,000 r/min (Oil). It is designed to support significant radial loads and handle moderate bidirectional axial loads. With its 8 mm bore and integrated double-steel shields, the MR148-ZZ is ideally suited for compact motors, miniature precision devices, and applications where managing dust and debris in confined spaces is a primary concern.

MR148-ZZ Deep Groove Ball Bearing For Compact Motors & Precision Mechanisms | 8×14×4 mm

Comprehensive Applications

Suitable for a wide variety of precision and industrial uses that demand compact dimensions and environmental durability:

Precision & High-Speed Machinery
  • Small Motors & Spindles
  • Medical & Laboratory Instruments
  • Dental Handpieces
  • Micro Pumps & Compressors
Electric Motion Systems
  • Compact DC & BLDC Motors
  • Servo & Stepper Drives
  • Encoders & Positioning Systems
  • Automotive Small Actuators
Automation & Robotics
  • Robotic Joints & Grippers
  • Linear Motion Modules
  • Precision Rollers & Idlers
  • Optical Positioning Devices
Consumer & Commercial Equipment
  • IT Cooling Fans
  • Office Automation Devices
  • Household Appliances
  • Hobby & Model Projects (RC, Drones)

Key Performance Features

01. Effective Dual Steel Shield Protection

Dual pressed steel shields provide reliable, non-contact sealing against dust and airborne particles. This configuration helps retain factory-applied lubricant, extends service intervals, and maintains minimal rotational drag for efficient, free-running operation.

02. High Load Capacity in an Ultra-Thin Profile

Constructed to extra-light series dimensions (8×14×4 mm), this bearing delivers notable radial load capacity within an exceptionally slim 4 mm width. Its compact yet robust build is tailored for durability and reliable performance in space-critical applications.

03. Stable Operation at Elevated Speeds

Available with precision grades up to ABEC 5 (P5) and featuring optimized internal geometry, the MR148-ZZ minimizes friction and vibration. This enables stable, consistent, and quiet performance at high rotational speeds, even within demanding compact assemblies.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series MR Series – Extra Light
Basic Designation MR148
Suffix ZZ (Double Steel Shields)
Bore Diameter (d) 8 mm
Outer Diameter (D) 14 mm
Width (B) 4 mm
Material (Races & Balls) Chrome Steel (GCr15 / SAE 52100)
Precision Class Standard / P5 Grade Available
Cage Material Steel Stamped
Dynamic Load Rating (Cʳ) 5.10 kN
Static Load Rating (C₀ʳ) 2.35 kN
Limiting Speed (Grease) 24,000 r/min
Limiting Speed (Oil) 32,000 r/min
Weight (approx.) 14 g

Interchange Part Numbers

Compatible equivalents include:

  • SKF: MR148-ZZ
  • NSK: MR148 ZZ
  • FAG: MR148 ZZ
  • NTN: MR148ZZ
  • NMB: MR148ZZ

Design & Configuration

The MR148-ZZ is supplied as a standard, grease-lubricated unit equipped with dual pressed steel shields. This offers a practical balance between effective contamination resistance and low running friction. For operating environments that demand sealing against moisture or fine particulates, the double rubber-sealed variant (MR148-2RS) is available.

"An optimal selection for space-sensitive, high-speed applications such as compact drive units and precision mechanisms. The MR148-ZZ delivers essential dust protection, smooth operation, and a dependable ultra-slim footprint for designs with stringent layout constraints."



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