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63 Series
Home Deep Groove Ball Bearings 63 Series

634 ZZ Deep Groove Ball Bearing for General Compact Machinery | 4x16x5 mm

634 ZZ Deep Groove Ball Bearing for General Compact Machinery | 4x16x5 mm

The 634-ZZ is a Premium Miniature Deep Groove Ball Bearing engineered for applications that demand compactness and reliable performance. Featuring double metal shields (ZZ) on both sides, this precision metric bearing provides effective protection against dust and contaminants while ensuring low-friction operation. With a 4mm bore and a robust outer diameter, it is an ideal choice for small yet demanding applications such as precision instruments, high-performance micro-motors, and compact machinery where space is limited but durability is required.

634 ZZ Deep Groove Ball Bearing 4x16x5 mm | ISO 63 Series – Medium | Double Shielded

A precision miniature bearing built with the universal deep groove geometry. Engineered for smooth and reliable performance at speeds up to 28,000 r/min (Oil). The 634-ZZ ball bearing is capable of supporting significant radial loads relative to its size, making it a versatile and dependable component for industrial, precision mechanical, and high-performance hobbyist equipment.

626 Z Miniature Deep Groove Ball Bearing 6x19x6mm - Single Metal Shielded Radial Bearing for High Speed Motors

Comprehensive Applications

Ideally suited for a broad spectrum of equipment:

Precision Instruments & Drives
  • Optical Encoders & Scanners
  • Laboratory & Medical Devices
  • Measuring & Positioning Stages
  • High-End Hobby & Model Making
Small Gearboxes & Transmissions
  • Micro Gear Reducers
  • Small Power Tool Gearboxes
  • RC Model Gear Drives
  • Valve Actuator Gear Trains
Motor & Actuator Systems
  • Stepper & Servo Motor Shafts
  • DC Motor Axles
  • Actuator Output Shafts
  • Cooling Fan Hubs
General Compact Machinery
  • Small Conveyor Rollers
  • Packaging Mechanism Guides
  • Textile Machine Bobbins
  • Food Processing Small Drives

Key Performance Features

01. Design & Protection

The dual non-contact pressed steel shields offer reliable two-sided protection against dust and larger particles. This effective sealing solution helps retain grease, extend service intervals, and maintain low rotational torque in various operating conditions.

02. Durable & Versatile Performance

As part of the medium series, the 634-ZZ provides an excellent balance of load capacity, speed capability, and durability within its compact dimensions. Its robust construction is suited for continuous operation in demanding environments.

03. Smooth & Stable Operation

Manufactured to standard industrial tolerances for reliable quality (up to P5 precision grades). ). Its optimized internal geometry promotes smooth and stable rotation, reducing vibration and noise in applications such as small gear reducers, encoders, and precision mechanisms.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series 63 Series – Medium
Basic Designation 634
Suffix ZZ (Both sides with steel shields)
Bore Diameter (d) 4 mm
Outer Diameter (D) 16 mm
Width (B) 5 mm
Material (Races & Balls) Chrome Steel (GCr15 / SAE 52100)
Precision Class Standard / P5 Grade Available
Cage Material Pressed Steel Ribbon
Dynamic Load Rating (Cʳ) 2.52 kN
Static Load Rating (C₀ʳ) 1.12 kN
Limiting Speed (Grease) 22,000 r/min
Limiting Speed (Oil) 28,000 r/min
Weight (approx.) 3.7 g

Interchange Part Numbers

Direct replacement for:

  • SKF: 634-2Z
  • NSK: 634 ZZ
  • FAG: 634-ZZ
  • NMB: MR84ZZ
  • NTN: 634ZZ

Design & Configuration

The 634-ZZ is supplied with double pressed steel shields as the standard configuration. For environments requiring protection against moisture or where lower starting torque is essential, alternative versions with contact rubber seals (634-2RS) can be selected.

"For applications like small gear reducers, precision motor encoders, or high-torque micro mechanisms, the 634-ZZ provides dependable performance and contamination protection.

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Request a Quote for Ball Bearings

Request a Quote for Ball Bearings
Please submit your inquiry below for detailed product and pricing information. We will get back to you within 24 hours.
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