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- Bearing Numbering System and Auxiliary Symbols
Product/technological information
1. Bearing Numbering System and Auxiliary Symbols
| Material | Bearing Type | Bearing Basic Part No. | Material | Cages | Seals & Shields | Balls(Note 1) | Radial Clearance | Tolerance Class | Lubricant | |
|---|---|---|---|---|---|---|---|---|---|---|
| Ex.1 | 688 | H | J | ZZ | MC3 | P0 | SRL | |||
| Ex.2 | F | 608 | TW | 2RS | MC4 | P6 | SRL | |||
| Ex.3 | MR | 52 | W | ZZ | MC2 | P5 | AF2 | |||
| Ex.4 | S | MF | 128 | W | TTS | MC3 | P6 | SRL | ||
| Ex.5 | S | ER | 1458 | W | ZZS | C0 | A3 | SRL | ||
| Ex.6 | 6205 | H | RJ | 2RS | C3 | P0 | AV2 | |||
| Ex.7 | F | 6706 | W | 2RU | C0 | P0 | SRL | |||
| Ex.8 | S | R | 144 | J | ZZS | MC4 | A5P | AF2 | ||
| Ex.9 | R | 10 | RJ | ZZ | CB | C2 | A1 | AF2 | ||
| Ex.10 | F | 3-8M | TP | P0 | AF2 |
Note 1: For hybrid type bearings (steel rings and ceramic balls), please contact our company for details.
Material
- High Carbon Chromium Bearing Steel
SUJ2: No Symbol - Stainless Steel
KS440 (QD51, ACD34): (Outer / Inner rings)
SUS440C: (Balls)
Standard Metric Series: H
MR, MF, ET and Inch Series: S
- Ceramic
Si3N4: CB (Balls)
Bearing Types
| Inch-series Single-Row Deep Groove Ball Bearing: | R |
|---|---|
| Inch-series Single-Row Deep Groove Ball Bearing with Flange: | FR |
| Inch-series Single-Row Deep Groove Ball Bearing with Extended Inner Ring: | RW |
| Inch-series Single-Row Deep Groove Ball Bearing with Extended Inner Ring and Flange: | FRW |
| Metric-series Single-Row Deep Groove Ball Bearing: | No symbol |
| Metric-series Single-Row Deep Groove Ball Bearing with Flange: | F |
| Special Metric-series Single-Row Deep Groove Ball Bearing: | MR |
| Special Metric-series Single-Row Deep Groove Ball Bearing with Flange: | MF |
| Special Metric-series Extra Thin Single-Row Deep Groove Ball Bearing: | ET |
| Special Inch-series Extra Thin Single-Row Deep Groove Ball Bearing: | ER |
| Thrust Ball Bearing with Raceway: | FM |
| Thrust Ball Bearing without Raceway: | F |
Bearing Basic Part No.
Indicates the bearing type and dimension series symbol, and the bore diameter number.
Cages
The symbol may not be displayed
| Two-Piece Steel Ribbon Type: | J |
|---|---|
| One-Piece Steel Snap Type: | W |
| One-Piece Nylon Snap Type: | TW |
| Two-Piece Steel Rivet Type: | RJ |
| Full Complement Type (without Cage): | V |
| Thrust FM Type: | TP |
| Thrust F Type: | TD |
Seals & Shields
| Teflon Seals with Snap Rings on Both Sides: | TTS |
|---|---|
| Steel Shields with Snap Rings on Both Sides: | ZZS |
| Pressed-steel Shields on Both Sides: | ZZ |
| Contact Rubber Seals on Both Sides: | 2RS |
| Non-Contact Rubber Seals on Both Sides: | 2RU |
Radial Clearance
- Standard deep groove ball bearing: C2, C0 (CN), C3, C4, C5
Refer to the [Internal Clearance of Bearings] for details. - Miniature / small ball bearings: MC1, MC2, MC3, MC4, MC5, MC6
Refer to the [Internal Clearance of Bearings] for details.
Tolerance Class
| JIS Class 0: | P0 (The symbol may not be displayed) |
|---|---|
| JIS Class 6: | P6 |
| JIS Class 5: | P5 |
| JIS Class 4: | P4 |
| ANSI/ABMA ABEC1 | A1 (The symbol may not be displayed) |
| ANSI/ABMA ABEC3 | A3 |
| ANSI/ABMA ABEC5 | A5 |
| ANSI/ABMA ABEC7 | A7 |
| ANSI/ABMA High-precision instrument ball bearing Class 5P: | A5P |
| ANSI/ABMA High-precision instrument ball bearing Class 7P: | A7P |
Lubricants
Main grease brands
| Multemp SRL (Our standard grease): | SRL |
|---|---|
| Alvania Grease S2: | AV2 |
| Barrierta L55/2 H1: (For high temperatures): | L55 |
| Molykote 33M (For low load / low temperatures): | M3M |
| Krytox 240AC (For high temperatures): | K24 |
| ISOFLEX SUPER LDS18: | SL8 |
| Beacon 325J: | B32 |
Main oil brands
| AeroShell Fluid 12 (Our standard oil): | AF2 |
|---|---|
| Windsor Lube L-245X: | WL2 |