KOYO company bearing code small solution

**KOYO Bearing Code Explanation** The KOYO bearing code is composed of the original code, front code, and rear code. The root code identifies the bearing series and size. The front code specifies the bearing type and components, while the rear code indicates features such as design, sealing, dust protection, lubrication, heat treatment, and other technical requirements. ### Front Code Examples: - **C**: Cylindrical roller bearing (or bearing itself). Example: C00210 - **45C**: Paired tapered roller bearings, face-to-face arrangement. Example: 45C30210 - **46C**: Paired tapered roller bearings, back-to-back arrangement. Example: 46C30210 - **4CRI**: Four-row cylindrical roller bearing inner ring. Example: 4CRI4560F - **4CRO**: Four-row cylindrical roller bearing outer ring. Example: 4CRO660AF - **E**: Magnetic motor ball bearing, with positive outer diameter tolerance. Example: E10 - **EN**: Magnetic motor ball bearing, with negative outer diameter tolerance. Example: EN10 - **IR**: Needle bearing inner ring (inch). Example: IR1212 - **IRA**: Needle bearing inner ring, wider than IR series (inch). Example: IRA20 - **IRM**: Needle roller bearing inner ring. Example: IRM710 - **M**: Maximum load capacity ball bearing. Example: M6311 - **OR**: Needle bearing, with only the outer ring. Example: OR10876 - **F**: Deep groove ball bearing with flange. Example: F603 - **TR**: Non-standard single row tapered roller bearing. Example: TR060702 - **W**: Wide deep groove ball bearings. Example: W602ZZX ### Rear Code Details: #### 1. Internal Layout: - **A**: Angular contact bearing, contact angle 30° (not marked). Example: 7210 - **B**: Angular contact bearing, contact angle 40°. Example: 7210B - **C**: Angular contact bearing, contact angle 15°. Example: 7210C - **C**: Tapered roller bearing, contact angle 20°. Example: 30303C - **D**: Tapered roller bearing, contact angle 28°30'. Example: 30305D - **G**: Axial clearance adjustment for tapered roller bearings. - **J**: Tapered roller bearing, conforms to ISO group. Example: 30206J - **N**: Tapered roller bearing, special noise requirement. Example: 30208N - **R**: Increased load capacity for conical and cylindrical roller bearings. Example: 22228R #### 2. Sealed and Dustproof Features: - **OR**: Ball bearings with O-rings. Example: 6201+OR - **RK**: Single-sided, double-lip synthetic rubber seal. Example: 6210RK - **2RK**: Double-sided, double-lip synthetic rubber seal. Example: 6210.2RK - **RS**: Single-sided, lip-type synthetic rubber seal. Example: 6210RS - **2RS**: Double-sided, lip-type synthetic rubber seal. Example: 6210-2RS - **RSA**: Single-sided, metal cover with synthetic rubber seal. Example: 88107RSA - **2RSA**: Double-sided, metal cover with synthetic rubber seal. Example: 88107-2RSA - **RSB**: Single-sided, metal cover with synthetic rubber seal. Example: 88107RSB - **2RSB**: Double-sided, metal cover with synthetic rubber seal. Example: 88107-2RSB - **RSC**: Silicone rubber RS seal. Example: 6210RSC - **RSD**: Polypropylene rubber RS seal. Example: 6210RSD - **RSE**: Single-sided, rib-guided synthetic rubber seal. Example: 6206RSE - **2RSE**: Double-sided, rib-guided synthetic rubber seal. Example: 6206-2RSE - **RSF**: Fluorinated rubber RS seal. Example: 6210RSF - **RU**: Single-sided, non-lip synthetic rubber seal. Example: 6205RU - **2RU**: Double-sided, non-lip synthetic rubber seal. Example: 6205-2RU - **TR**: Single-sided, three-lip metal cover synthetic rubber seal. Example: 4508B-TR - **2TR**: Double-sided, three-lip metal cover synthetic rubber seal. Example: 4508B-2TR - **U**: Single-sided, lip-type synthetic rubber seal for needle roller bearings. Example: NA4916U - **UU**: Double-sided, lip-type synthetic rubber seal for needle roller bearings. Example: NA4916UU - **Z**: Single-sided steel dust cover. Example: 6205.Z - **ZZ**: Double-sided steel dust cover. Example: 6205ZZ - **ZL**: Single-sided L-shaped steel dust cover. Example: 6207ZL - **ZX**: Single-sided steel dust cover with snap ring. Example: 6205ZX - **ZXL**: Single-sided L-shaped steel dust cover with snap ring. Example: 6203ZXL - **ZZL**: Double-sided steel dust cover with L-shaped inner diameter. Example: 6203ZZL - **ZZX**: Double-sided steel dust cover with snap ring. Example: 605ZZX - **ZZXL**: Double-sided steel dust cover with retaining ring and L-shaped inner diameter. Example: 6303ZZXL #### 3. Cage and Retainer Information: - **FC**: Carbon steel solid cage. - **FG**: Nylon die-cast cage. - **FM**: Ball casting solid cage. - **FP**: Pillar-welded carbon steel solid cage. - **FR**: High-stress brass solid cage. - **FS**: Pillar solid cage. - **FT**: Phenolic resin solid cage. - **FY**: High-stress brass solid cage. - **GP**: Silver-plated cage. - **IP**: Silver-plated, additional rhodium-plated cage. - **LC**: Non-riveted carbon steel solid cage. - **LP**: Galvanized cage. - **LR**: Riveted high-stress brass solid cage. - **MM**: Nickel-copper alloy cage. - **MS**: Pillar high-stress bronze solid cage. - **PA**: Solid cage, outer ring centering. Example: 6205PA - **PB**: Solid cage, inner ring centering. Example: 6205PB - **PD**: Solid cage, steel ball centering. Example: 6205PD - **Q1**: Solid cage, outer ring centering, roller bearing. - **Q2**: Solid cage, inner ring centering, roller bearing. - **R**: Stamped cage with greater thickness than standard. - **RP**: Phosphated treatment cage. - **RT**: Special treatment ball bearing cage. - **SM**: Ferrosilicon bronze solid cage. - **SN**: Tinned cage. - **TY**: High-stress brass T-type solid cage. - **YP**: Copper alloy belt stamped cage. - **YS**: Stainless steel stamped cage. - **YY**: Copper alloy nail stamped cage. - **V**: Full ball or full roller. Example: N2217V - **VH**: Cylindrical roller bearing with roller block spacers. Example: NU309VH #### 4. Clearance: - **C1**: Radial clearance less than C2. - **C2**: Radial clearance less than standard. - **CN**: Standard radial clearance. - **C3**: Radial clearance greater than standard. - **C4**: Radial clearance greater than C3. - **C5**: Radial clearance greater than C4. - **CM**: Motor bearing, special radial clearance (not applicable to cylindrical roller bearings). - **CS**: Special radial clearance. - **CT**: Motor cylindrical roller bearings (not exchangeable), special radial clearance. - **CX**: Special radial clearance. - **NA**: Cylindrical roller bearings, radial clearance (not exchangeable). #### 5. Service Level: - **Omitted**: Conforms to JIS standard level. - **P2**: Conforms to JIS Level 2. - **P4**: Conforms to JIS Level 4. - **P5**: Conforms to JIS Level 5. - **P6**: Conforms to JIS Level 6. - **P6X**: Super precision service level. - **UP**: Special precision level. --- **Related Bearing Knowledge:** - SKF bearing temperature detection methods and application environment for maximizing bearing life. - Short cylindrical roller bearing matching qualification method. - Internal layout analysis of NSK bearings. **References:** - This article is sourced from China Bearing Network. - Please cite the source: http://www.chinabearing.net **Next Article:** - The production process of yaw bearings will be discussed in the next section: Determining the scale parameters of SKF imported bearings.

Screw Locking Wire Thread Insert

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