Miniature Angular Contact Bearings

Miniature Angular Contact Bearings are precision-engineered components designed to accommodate both radial and axial loads simultaneously in extremely compact spaces. The inner diameter normally less than 10mm that is why called miniature angular contact bearings.

Their internal design features inner and outer ring raceways that are displaced relative to each other in the direction of the bearing axis. This specialized geometry makes them ideal for high-speed, high-precision applications where space is strictly limited, but system rigidity and accuracy cannot be compromised.

ZMS is a professional supplier of miniature angular contact bearings in China for more than 15 years.
We supply following series:

· 71800 Series — Ultra-light, very thin section, excellent for highest speeds (718/5 C/AC, 718/6 C/AC, 718/7 C/AC, 718/9 C/AC, 71800 C/AC)
· 71900 Series — Light series, great balance of load and speed(719/5 C/AC, 719/6 C/AC, 719/7 C/AC, 719/8 C/AC, 719/9 C/AC, 71900 C/AC, 71900 C/AC)
· 7000 Series — Light duty, very common for precision spindles and small motors(705C/AC, 706C/AC, 707C/AC, 708C/C, 709C/AC, 7000C/AC)
· 7200 Series — Slightly heavier than 7000, higher load capacity (still considered miniature up to ~20 mm bore)(723C/AC, 724C/AC, 725C/AC, 726C/AC, 727C/AC, 728C/AC,729C/AC…7200C/AC)

Item

Desc

Technical Specifications

Bore Size Range (d): Typically from 1mm up to 10mm

Outer Diameter Range (D): Typically from 3mm up to 30mm

Standard Contact Angles: 15° (Optimized for High Speed), 25° (Balanced Loads), 30° (Optimized for High Axial Load)

Material Options: High Carbon Chrome Steel (52100), Stainless Steel (440C), Hybrid Ceramic (Silicon Nitride balls for extreme speeds)

Cage/Retainer Types: Phenolic resin, Polyamide (Nylon), Stainless Steel crown type

Precision Classes: ABEC-5, ABEC-7, ABEC-9 (ISO P5, P4, P2)

Sealing Options: Open (standard), ZZ (Dual Metal Shields), 2RS (Dual Rubber Contact Seals)

Key Features & Benefits

Combined Load Capacity: Efficiently manages both high radial loads and unidirectional axial loads at the same time.

High-Speed Performance: Optimized internal geometry and contact angles minimize friction, allowing for exceptional rotational speeds.

Ultra-Compact Design: Miniature dimensions allow for significant weight reduction and space-saving in advanced micro-equipment.

Exceptional Rigidity: Can be preloaded (mounted in pairs or sets) to eliminate internal clearance, achieving high system rigidity and precise shaft guidance.

Low Noise & Vibration: Manufactured to stringent high-precision tolerances to ensure smooth, quiet operation in highly sensitive environments.

Common Applications

Medical & Dental: Surgical handpieces, high-speed dental drills, blood analyzers, medical imaging devices

Robotics & Automation: Micro-actuators, small robotic joints, precision positioning stages, drone gimbals

Aerospace & Defense: Gyroscopes, navigation systems, UAV components, targeting systems

Precision Instruments: Rotary encoders, optical assemblies, measuring devices, high-speed centrifuges

Electronics & Motors: Spindle motors, hard disk drives, specialized high-speed cooling fans