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

• Optical Encoders & Scanners
• Laboratory & Medical Devices
• Measuring & Positioning Stages
• High-End Hobby & Model Making

• Micro Gear Reducers
• Small Power Tool Gearboxes
• RC Model Gear Drives
• Valve Actuator Gear Trains

• Stepper & Servo Motor Shafts
• DC Motor Axles
• Actuator Output Shafts
• Cooling Fan Hubs

• Small Conveyor Rollers
• Packaging Mechanism Guides
• Textile Machine Bobbins
• Food Processing Small Drives

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.

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.