• Micro-actuator drive systems
• Miniature robotic joint mechanisms
• Nanoscale positioning stages
• Automated micro-dispensing units

• High-speed dental handpiece turbines
• Portable surgical micro-tools
• Compact diagnostic imaging components
• Miniaturized drug delivery pumps

• Smartphone vibration motors
• Miniature drone gimbal stabilizers
• Ultra-compact cooling fans
• Wearable device mechanisms

• Micro-spectrometer rotating arrays
• Laser scanning mirror pivots
• Miniature surveying instruments
• Precision horology (watchmaking) mechanisms

01. Micro-Scale Protection

Fitted with twin NBR (Nitrile Butadiene Rubber) lip seals, this bearing perfectly guards its pre-filled premium micro-bearing grease. These engineered micro-seals effectively deflect microscopic dust particles and moisture without inducing excessive drag, preserving optimal torque levels for small-scale motors.

02. Ultra-Miniaturized Footprint

Forged from premium-grade chrome steel (GCr15), the 681-2RS features an incredibly small 1 mm bore within a 3 mm profile. This ultra-compact architecture empowers equipment designers to dramatically downsize their mechanisms, enabling the creation of next-generation micro-devices without losing structural integrity.

03. High-Velocity Precision

Manufactured to rigorous P5 precision tolerances and strict vibration limits (Class V), the micro-balls and raceways provide fluid dynamics at extremely high speeds. This ultra-low vibration signature is crucial for stabilizing delicate micro-sensors, advanced optics, and miniaturized consumer electronics.

Interchange Part Numbers

Leading industry equivalents for cross-reference:

• SKF: 681-2RS1
• NSK: 681DD
• NTN: 681LLU
• KOYO: 681-2RS
• NMB: L-310-2RS

Design & Configuration

The standard configuration of the 681-2RS incorporates bilateral rubber seals, functioning as the ultimate "install-and-forget" solution for ultra-small mechanisms operating in environments susceptible to microscopic contamination. Its incredibly tiny 1 mm width ensures maximum space-saving efficiency while delivering flawless rotational support.

Should environmental demands exceed standard parameters, stainless steel variants (S681-2RS) are readily accessible to prevent corrosion in medical or damp environments. If operational speeds are the primary concern and contamination risk is minimal, the dual-shielded (681-ZZ) iteration provides an even lower-friction alternative.

"For micro-engineering challenges where every millimeter matters, the Welink 681-2RS provides uncompromising rotational accuracy in a microscopic footprint, empowering the future of robotics and micro-electronics."