The 694ZZ/2RS micro deep groove ball bearing (size 4×11×4 mm) is a widely used miniature bearing model known for its compact design, high durability, and stable performance under continuous rotational loads. As a professional bearing manufacturer, NKMB offers high-precision 694 series bearings designed for demanding industrial environments that require quiet operation, long service life, and reliable performance.

This article provides a complete Google-optimized overview, including specifications, precision grades, noise level, internal clearance, temperature range, expected lifespan, and key applications.

⭐ 1. 694ZZ/2RS Bearing Size & Technical Specifications

ZZ is recommended for high-speed rotation.
2RS is recommended for dusty or humid environments.

⭐ 2. Precision Grades (Tolerance Classes)

NKMB offers precision levels compliant with international standards:

• ABEC-1 / P0 – Standard industrial precision

• ABEC-3 / P6 – Higher precision, smoother rotation

• ABEC-5 / P5 – For more demanding applications such as motors, dental tools, and robotics

NKMB 694 series bearings maintain extremely tight dimensional tolerances for consistent rotational accuracy.

⭐ 3. Noise Level (Vibration Grade)

NKMB miniature bearings feature low-noise performance:

• Vibration Grade: V0 / V1 (low noise)

• Optimized raceway surface for reduced friction

• Balanced cage structure improves high-speed stability

This makes the 694ZZ/2RS suitable for precision motors requiring quiet operation.

⭐ 4. Internal Clearance (Radial Play)

Available internal clearance options:

• C0 (Standard) – Best choice for most equipment

• C2 – Tighter fit for high-precision devices

• C3 – Extra clearance for high-speed or high-temperature environments

NKMB recommends C0 or C3 depending on operating speed and heat load.

⭐ 5. Operating Temperature Range

• Standard Chrome Steel Bearings:
  –20°C to +120°C

• Rubber-Sealed 2RS Models:
  –20°C to +100°C

• High-Temperature Options Available upon request

The optimized lubrication formula ensures reliable performance throughout the temperature range.

⭐ 6. Expected Service Life

Typical service life for NKMB 694ZZ/2RS:

• 5,000 – 20,000 hours under normal loads

• Longer service life with correct lubrication and correct operating conditions

• Shielded (ZZ) bearings perform especially well in clean, high-speed environments

NKMB bearings undergo strict quality testing to ensure long operating reliability.

⭐ 7. Industry Applications

The compact 4×11×4 mm 694 bearing is widely used in:

✔ Electric motors & micro-motors

✔ 3D printers & automation equipment

✔ RC hobby models (cars, drones, helicopters)

✔ Medical devices & dental tools

✔ Robotics & precision instruments

✔ Skate wheels, tools, fishing reels

✔ Office equipment & small appliances

NKMB bearings are trusted by customers worldwide for stability, low noise, and long service life.

⭐ Why Choose NKMB 694ZZ/2RS Micro Bearings?

• High manufacturing precision

• Strict noise and vibration control

• Long service life with premium lubrication

• High-speed performance with minimal friction

• Strong sealing performance in 2RS models

• Suitable for global industrial applications

NKMB continues to provide reliable miniature bearings for brands requiring consistent quality.