• Articulated robotic arm joints
  
• Automated guided vehicle (AGV) drive units
  
• Precision pick-and-place actuators
  
• Micro-conveyor belt tensioners

• Compact brushless DC servo motors
  
• Industrial stepper motor assemblies
  
• Power tool armature supports
  
• High-efficiency rotary encoders

• Commercial drone rotor systems
  
• RC helicopter main shaft supports
  
• Professional gimbal camera stabilizers
  
• Remote-controlled vehicle gearboxes

• High-speed textile spinning machines
  
• Precision optical measuring instruments
  
• Small-scale fluid metering pumps
  
• Automated packaging line rollers

01. Ultra-Low Friction Shielding (ZZ)

Operating efficiency is maximized through the use of twin non-contact metal shields. Because there is no physical rubbing between the shield and the inner ring—unlike standard rubber seals—the 687-ZZ avoids unnecessary heat buildup and parasitic torque loss. This frictionless barrier is ideal for high-speed machinery requiring continuous, uninterrupted performance.

02. Space-Optimized Thin-Section Profile

Belonging to the 68 (thin-section) series, this bearing is characterized by an exceptionally low cross-section relative to its bore size. With dimensions of 7x14x5 mm, it empowers design engineers to downsize motor housings, reduce overall system weight, and achieve compact assemblies without sacrificing structural rigidity.

03. Rigorous Acoustic and Runout Control

Manufactured to stringent P0 (ABEC-1) standards, with P6 (ABEC-3) and P5 (ABEC-5) available for specialized requirements, the 687-ZZ delivers whisper-quiet operation. The strict dimensional tolerances and high-purity steel construction drastically reduce mechanical runout and vibration, ensuring smooth torque delivery in sensitive optical and medical devices.

Interchange Part Numbers

Fully interchangeable with the following industry-standard manufacturer codes:

• SKF: 618/7-2Z
• NSK: 687ZZ
• FAG: 687ZZ
• NTN: 687ZZ
• KOYO: 687ZZ

Design & Configuration

Every 687-ZZ bearing arrives factory-lubricated with premium high-speed grease, rendering it completely ready for installation and virtually maintenance-free under normal operating conditions. For custom requirements involving extreme heat or specialized low-noise applications, alternative lubricants and C3 internal clearances can be provided. If the bearing will be exposed to heavy moisture or fine particulate dust, we highly recommend upgrading to the 687-2RS (contact rubber seal) variant.

"Engineered for maximum efficiency in minimal spaces, the 687-ZZ is the premier choice for lightweight, high-speed rotary applications."