EZO miniature and small-sized bearings feature a complete coding system composed of base model, material, structure type, cage design, seal/shield configuration, internal clearance, precision grade and lubrication grease. Each code represents specific structural features and performance parameters. This guide adopts a clear list format to fully decode EZO bearing markings without complex charts, helping you quickly identify product specifications.

1. Overall Composition of EZO Bearing Model

The complete EZO model follows a fixed sequence:Material Prefix → Bearing Structure Type → Base Size Model → Cage Code → Seal & Shield Type → Radial Internal Clearance → Precision Grade → Lubricant Code

Example: S-MF-128-W-TTS-MC3-P6-SRLEvery segment corresponds to independent technical attributes for fast recognition and selection.

2. Detailed Breakdown of Each Code

2.1 Material Code (Inner Ring, Outer Ring & Balls)

• No marking: Standard high-carbon chromium bearing steel SUJ2

• H: Stainless steel for metric standard series bearings

• S: Stainless steel for MR, MF, ET and imperial series bearings

• CB: Silicon nitride ceramic balls, applied for hybrid ceramic bearings

2.2 Bearing Structure Type

• No marking: Single row metric deep groove ball bearing

• F: Metric single row deep groove ball bearing with flange

• MR: Special compact metric deep groove ball bearing

• MF: Special metric flanged deep groove ball bearing

• R: Imperial size single row deep groove ball bearing

• FR: Imperial flanged deep groove ball bearing

• RW: Imperial bearing with widened inner ring

• FRW: Imperial flanged bearing with widened inner ring

• ET: Ultra-thin wall metric deep groove ball bearing

• ER: Ultra-thin wall imperial deep groove ball bearing

• FM: Thrust ball bearing with raceway

• F: Thrust ball bearing without raceway

2.3 Base Size Model

The core part of the bearing model, directly defining the bearing series, bore diameter, outer diameter and overall width. Common specifications include 688, 608, 6205, 128 and more, with unified fixed dimensional standards.

2.4 Cage Type Code

• J: Two-piece pressed steel wave cage

• W: One-piece steel crown cage

• TW: One-piece nylon crown cage

• RJ: Riveted two-piece steel wave cage

• V: Full ball design without cage

• TP: Special cage for FM thrust bearings

• TD: Special cage for F thrust bearings

2.5 Dustproof & Sealing Structure

• ZZ: Double-sided steel dust shields

• ZZS: Double-sided snap-ring type steel dust shields

• 2RS: Double-sided contact rubber seals

• 2RU: Double-sided non-contact rubber seals

• TTS: Double-sided PTFE seals with snap rings

2.6 Radial Internal Clearance

• Standard clearance series for regular bearings: C2 ＜ C0 (Standard) ＜ C3 ＜ C4 ＜ C5

• Dedicated micro & miniature bearing clearance: MC1 ＜ MC2 ＜ MC3 ＜ MC4 ＜ MC5 ＜ MC6

2.7 Precision Grade

• JIS industrial standard: P0 (Standard, omitted by default) ＜ P6 ＜ P5 ＜ P4

• ABMA precision standard: A1 (Standard, omitted) ＜ A3 ＜ A5 ＜ A7

• Ultra-high precision for instruments: A5P, A7P

2.8 Lubrication Grease & Oil Grade

• SRL: Multemp SRL multi-purpose standard grease

• AV2: Alvania universal lubricating grease

• L55: High-temperature resistant Barrierta special grease

• M3M: Low-temperature and low-load Molykote lubricant

• K24: Krytox high-temperature long-service-life grease

• SL8: High-speed special synthetic grease

• AF2: Aviation grade thin lubricating oil

3. Practical Model Interpretation Examples

1. 688 H J ZZ MC3 P0 SRLMetric 688 deep groove ball bearing, stainless steel material, steel wave cage, double-sided dust shields, MC3 internal clearance, standard P0 precision, equipped with SRL standard grease.

2. F608 TW 2RS MC4 P6 SRLMetric flanged 608 bearing, nylon cage, double-sided contact rubber seals, enlarged MC4 clearance, P6 high precision grade, general-purpose standard lubrication.

3. S-MF128 W TTS MC3 P6 SRLImperial special flanged bearing, stainless steel configuration, steel crown cage, high-performance PTFE sealing, medium clearance and high precision for sophisticated equipment.

4. Quick Recognition Tips

• Prefix H / S = Stainless steel material; CB = Ceramic hybrid ball bearing

• F, MF, FR = Flanged design; R series = Imperial size specification

• ZZ for dustproof, 2RS for waterproof and dustproof heavy sealing

• The larger the number after C / MC, the larger the bearing internal clearance

• The higher the digit of P / A grade, the higher the dimensional and rotational precision