FAG Deep Groove Ball Bearing Suffix List (2026 Official Complete Version)
The suffixes of FAG (Schaeffler's brand) deep groove ball bearings are crucial for identifying core parameters such as seals, cages,
clearance, accuracy, temperature, pairing, and material. Following the DIN 623-1 standard, the official definitions are clear and have strong industrial applicability. Below,
classified by function, it covers all common + special suffixes, along with their meanings, characteristics, and typical models, making it convenient for selection and model interpretation.
1. Sealing and Dust-proof Suffix (Most Commonly Used)
Contact-type sealing (lip type, dustproof and waterproof)
- RSR: Single-sided lip seal (NBR rubber), contact type, dust-proof and oil mist-proof. Example: 6205-RSR
- 2RSR: Double-sided lip seal, high protection, suitable for dirty and humid environments. Example: 6001-2RSR
- ELS: Single-sided contact seal (specific for C series)
- 2ELS: Double-sided contact seal (specific for C series)
2. Non-contact sealing (low friction, dust-proof)
- Z: Single-sided iron cover dust-proof cover (gap type), resistant to solid particles, not waterproof. Example: 6304-Z
- 2Z/ZZ: Double-sided iron cover dust-proof cover, suitable for low friction and high rotational speed. Example: 6206-2Z
- RZ: Single-sided rubber gap seal (non-contact), low friction, dust-proof performance superior to Z
- BRS: Single-sided labyrinth seal, applicable for special environmental protocols
II. Retainer suffix (Material + Structure + Guidance Method)
Steel cage
- J: Plate stamping cage (standard), lightweight and low cost. Example: 6204-J
- JN: Riveted steel plate cage, high rigidity and vibration resistance
- F: Machined steel solid cage, with rolling elements guiding, suitable for heavy loads
- FA: Machined steel solid cage, with outer ring guiding
2. Brass retaining ring (wear-resistant, suitable for high temperatures)
- M: Machined brass solid retaining ring, steel ball guide, high speed/high temperature preferred. Example: 6040-M
- MA: Brass solid retaining ring, outer ring guide
- MB: Brass solid retaining ring, inner ring guide
- Y: Pressed brass sheet retaining ring, economical brass frame. Example: 61811-Y
3. Engineering plastic cage (high speed, low noise, self-lubricating)
- TVH: Fiberglass-reinforced nylon PA66 solid cage (self-locking pocket), preferred for high-speed/low-noise applications. Example: 4200-B-TVH
- TVP: Fiberglass-reinforced nylon window-type cage
- TVP2: Improved fiberglass-nylon cage, with temperature resistance increased to 120℃
4. Special retaining ring
- V: Fully packed rolling elements (without cage), designed for extreme load capacity and low-speed heavy-duty applications
III. Clearance Suffix (Radial Internal Clearance, Factory Pre-set)
- C0/CN: Standard clearance (default, omitted), normal temperature and regular operating conditions
- C1: Very small clearance, precision / low temperature / light load
- C2: Small clearance, precision equipment / interference fit
- C3: Large clearance, high temperature / tight fit / heavy load (common in motors)
- C4: Extra large clearance, high temperature + heavy load + high rotational speed
- C5: Super large clearance, extreme high temperature / special operating conditions
IV. Postfix for Precision Grades (Tolerance and Rotational Precision)
- P0: Level 0 (Standard, omitted)
- P6: Level 6, superior precision to P0, general precision equipment
- P5: Level 5, high precision, machine spindle/high-speed motor
- P4: Level 4, ultra-precision, precision machine/tools
- P2: Level 2, extremely high precision, laboratory/special instruments
- SP: Dimension P5, rotation P4 (for spindle-specific use)
- UP: Dimension P4, rotation super P4 (high-precision spindle)
V. Internal Design and Series Suffixes
- C: C series (new generation optimized design), low friction, high speed, long lifespan
- B: Improved internal design, enhanced load-bearing/rotational speed capability. Example: 4200-B-TVH
- E: Reinforced design, for heavy load/impact conditions
- G: Generator-specific design (insulation compatibility)
VI. Pairing Installation Suffix (Double Bearing Combination, Pre-tightening/Rigid)
- DB: O-type pairing (back-to-back), high rigidity, anti-overturning moment
- DF: X-type pairing (face-to-face), good coaxiality, thermal expansion compatibility
- DT: Series pairing (in the same direction), high axial load-bearing, unidirectional thrust
VII. Temperature stabilization suffix (Dimension stability under high-temperature conditions)
- S0: With a temperature resistance up to 150℃, undergoes dimensional stabilization treatment
- S1: With a temperature resistance up to 200℃, undergoes special heat treatment
VIII. Materials and Special Coating Suffixes
- S-W203B: Made of stainless steel, resistant to corrosion
- J20G: Outer ring with insulating coating (5000V DC), protecting the motor from electrical corrosion
- J20GA: Thin outer ring insulating coating (3000V DC)
IX. Place of Origin and Version Suffix (Original Factory / Contract Manufacturer / Series)
- -22: Standard dust-proof cover version (earlier model)
- -C-22: C series dust-proof cover (Portuguese factory)
- -H-22: Chinese OEM dust-proof cover version
- -Co16: Joint factory production version
X. Model Analysis Example (Quick Application)
- 6205-2RSR-J-C3: 6205 specification + double-sided lip seal + steel plate stamping frame + large clearance
- 6001-2Z-Y-P6: 6001 specification + double-sided iron cover + stamped brass frame + P6 accuracy
- 6304-C-TVH-MA: C series + fiberglass nylon frame + brass outer ring guiding frame
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