693ZZ / 693Z Miniature Ball Bearing (3mm x 8mm x 4mm)

Product Overview

High-Precision 693ZZ / 693Z Miniature Deep Groove Ball Bearing

The 693ZZ (693Z) Miniature Ball Bearing is a metric single-row thin-section deep groove ball bearing engineered for high-precision, low-vibration, and high-speed rotary applications. Featuring an inner bore size of 3.0mm, an outer diameter of 8.0mm, and a width of 4.0mm, the 693ZZ is a widely used component across micro-motion drives, 3D printing assemblies, and precision electronics.

High-Grade Chrome Steel & Dust Shielded Protection

Manufactured from high-carbon chromium bearing steel (GCr15 / AISI 52100), the inner ring, outer ring, and precision micro balls undergo specialized thermal heat treatment to achieve high surface hardness (HRC 60-65) and structural fatigue strength. Equipped with dual non-contact stamped metal shields (ZZ designation), the bearing retains factory grease and shields internal raceways against ambient dust and foreign particulates.

Low Friction & Smooth High-Speed Performance

Equipped with precision-honed raceway grooves and a balanced ribbon cage, the 693ZZ bearing achieves smooth, quiet running performance at speeds up to 67,000 RPM under oil lubrication. Its tight dimensional tolerances ensure reliable radial support and minimal axial play in micro-spindle assemblies.

Custom Manufacturing & Material Options

To support specialized industrial and OEM application environments, custom configurations are available upon request:

• Stainless Steel Options: Stainless steel (SUS440C / SUS304) construction for damp, corrosive, or medical-grade environments.
• Rubber Sealed Variant: Rubber contact sealed model (693-2RS) available for enhanced liquid and dust protection.
• Flanged Ring Design: Flanged outer ring model (F693ZZ) available for simplified housing mounting and axial location.
• Precision Grading: Available in ABEC-1, ABEC-3, ABEC-5, and ABEC-7 tolerance classes.

Technical Specifications

Key Features

Applications