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Cylindrical Roller Bearings
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Cylindrical Roller Bearings
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Cylindrical Roller Bearings
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| Part Category | Part Name | Recommended Materials | Specifications (National Standard / Examples) | Core Dimensional Parameters (Examples, Unit: mm) | Key Performance Parameters | Applicable Scenarios | Remarks |
| Single-row Cylindrical Roller Type | Single-row Cylindrical Roller Bearing Inner Ring (Type N) | - Bearing steel (GCr15SiMn, general purpose) - Stainless steel (440C, corrosion-resistant) - High-temperature bearing steel (GCr15SiMo, high-temperature) | GB/T 283 Examples: N205 inner ring, NU210 inner ring, NJ215 inner ring | Bore diameter (d): 25 (G5), 50 (k5), 75 (m5) Outer ring fitting diameter (d2): 36 (r6), 66 (r6), 96 (r6) Width (B): 14, 20, 25 Bore cylindricity: ≤0.002mm (Class P4), ≤0.004mm (Class P5), ≤0.008mm (Class P0) Raceway width (b): 12 (N205), 18 (NU210) | Hardness: HRC60-64 (GCr15SiMn), HRC58-62 (440C) Contact fatigue life: ≥2200h (rated load, GCr15SiMn) Surface roughness: Ra≤0.1μm (raceway surface), Ra≤0.2μm (end face) Temperature resistance: ≤150℃ (GCr15SiMn), ≤300℃ (440C), ≤250℃ (GCr15SiMo) | General industrial heavy radial load scenarios, such as motor spindles, reducer output shafts, water pump shafts; Type NU suitable for shaft end floating, Type NJ can withstand slight axial forces | Interference fit with shaft (H7/k5, light load), H7/m5 (medium load); Raceways require precision grinding (cylindricity deviation ≤0.003mm); GCr15SiMn requires integral quenching + low-temperature tempering (150-180℃) |
| Single-row Cylindrical Roller Type | Single-row Cylindrical Roller Bearing Outer Ring (Type N) | - Bearing steel (GCr15SiMn, general purpose) - Stainless steel (440C, corrosion-resistant) - Ceramic composite (Al₂O₃, lightweight) | GB/T 283 Examples: N205 outer ring, NU210 outer ring, NJ215 outer ring | Outer diameter (D): 52 (h6), 90 (h6), 130 (h6) Inner raceway diameter (D1): 42 (H7), 78 (H7), 110 (H7) Width (B): 14, 20, 25 Outer diameter roundness: ≤0.003mm (Class P4), ≤0.005mm (Class P5), ≤0.01mm (Class P0) Flange height (h): 3 (N205), 4 (NU210) | Hardness: HRC60-64 (GCr15SiMn), HRC58-62 (440C) Radial rated dynamic load: ≥28kN (N205), ≥65kN (NU210), ≥120kN (NJ215) Radial internal clearance: 0.008-0.022mm (Group C3), 0.015-0.03mm (Group C4) Impact resistance: Can withstand 1.3 times rated static load (instantaneous radial impact) | Cooperates with inner ring to achieve strong radial load bearing, suitable for dusty/vibrating working conditions (such as textile machinery, agricultural machinery), automobile gearboxes | Transition fit with bearing housing (H7/h6, general), H7/js6 (precision scenarios); Ceramic outer rings are 40% lighter than steel rings, suitable for high-speed noise reduction (such as precision motors); Type NJ outer rings have single flange, requiring cooperation with inner ring flange to prevent axial movement |
| Double-row Cylindrical Roller Type | Double-row Cylindrical Roller Bearing Inner Ring (Type NN) | - Bearing steel (GCr15, medium-heavy load) - Carburized steel (20CrNiMoA, high impact) - Stainless steel (316L, mild corrosion) | GB/T 283 (double-row type) Examples: NN308 inner ring, NNU412 inner ring | Bore diameter (d): 40 (k5), 60 (m5) Double raceway spacing (s): 12 (NN308), 20 (NNU412) Width (B): 23, 35 Bore cylindricity: ≤0.003mm (Class P4), ≤0.006mm (Class P5) Raceway symmetry: ≤0.005mm (Class P4) | Hardness: HRC60-64 (GCr15), HRC58-62 (20CrNiMoA carburized) Radial rated dynamic load: ≥95kN (NN308), ≥210kN (NNU412) Temperature resistance: ≤150℃ (GCr15), ≤200℃ (20CrNiMoA) Wear loss: ≤0.002mm/100h (oil lubrication, GCr15) | Heavy radial load scenarios, such as machine tool spindles (heavy cutting), rolling mill work rolls, crane drum shafts | Interference fit with shaft (H7/u6, heavy load); Carburized layer depth 1.0-1.5mm (20CrNiMoA) to enhance raceway impact resistance; Must ensure double raceway coaxiality ≤0.004mm to avoid uneven loading |
| Double-row Cylindrical Roller Type | Double-row Cylindrical Roller Bearing Outer Ring (Type NN) | - Bearing steel (GCr15, medium-heavy load) - High-temperature bearing steel (GCr15SiMo, high-temperature heavy load) - Stainless steel (440C, corrosion-resistant heavy load) | GB/T 283 (double-row type) Examples: NN308 outer ring, NNU412 outer ring | Outer diameter (D): 68 (h6), 130 (h6) Double inner raceway diameters (D1/D2): 52/58 (NN308), 85/95 (NNU412) Width (B): 23, 35 Outer diameter roundness: ≤0.003mm (Class P4), ≤0.006mm (Class P5) Mounting flange diameter (if flanged): 78 (NN308), 145 (NNU412) | Hardness: HRC60-64 (GCr15), HRC58-62 (GCr15SiMo) Radial rated static load: ≥70kN (NN308), ≥160kN (NNU412) Temperature resistance: ≤250℃ (GCr15SiMo), ≤300℃ (440C) Deformation resistance: Radial elastic deformation ≤0.0015mm/kN at room temperature | Withstands heavy radial loads + slight vibration, such as mining machinery transmission shafts, ship propulsion shafts, large motor rotors | Transition fit with bearing housing (H7/h6, medium load), H7/r6 (heavy load); High-temperature working conditions require high-temperature grease (such as molybdenum disulfide base); Flanged outer rings have higher positioning accuracy (flatness ≤0.01mm) |
| Full Complement Cylindrical Roller Type | Full Complement Cylindrical Roller Bearing Inner Ring (Type FC) | - Bearing steel (GCr15SiMn, heavy load) - Carburized steel (20CrMnTi, high wear resistance) - Stainless steel (440C, corrosion-resistant heavy load) | GB/T 283 (full complement type) Examples: FC205 inner ring, FC310 inner ring | Bore diameter (d): 25 (m5), 50 (s5) Number of raceways: 3 (FC205), 3 (FC310) Width (B): 30, 50 Bore cylindricity: ≤0.004mm (Class P5), ≤0.008mm (Class P0) Raceway depth (t): 4 (FC205), 6 (FC310) | Hardness: HRC60-64 (GCr15SiMn), HRC58-62 (20CrMnTi carburized) Radial rated dynamic load: ≥55kN (FC205), ≥180kN (FC310) Temperature resistance: ≤150℃ (GCr15SiMn), ≤200℃ (20CrMnTi) Wear resistance: Wear loss ≤0.005mm/100h (oil lubrication) | Low-speed heavy load scenarios, such as crane hoisting mechanisms, rolling mill auxiliary rolls, heavy-duty reducers | Interference fit with shaft (H7/s6, heavy load); No cage (full complement rollers), maximum speed ≤1500r/min; Carburized layer depth 0.8-1.2mm (20CrMnTi) to enhance raceway wear resistance |
| Full Complement Cylindrical Roller Type | Full Complement Cylindrical Roller Bearing Outer Ring (Type FC) | - Bearing steel (GCr15SiMn, heavy load) - Wear-resistant alloy steel (Mn13, abrasive-resistant) - Stainless steel (440C, corrosion-resistant heavy load) | GB/T 283 (full complement type) Examples: FC205 outer ring, FC310 outer ring | Outer diameter (D): 52 (h7), 110 (h7) Number of inner raceways: 3 (FC205), 3 (FC310) Width (B): 30, 50 Outer diameter roundness: ≤0.005mm (Class P5), ≤0.01mm (Class P0) Flange thickness (t): 3 (FC205), 5 (FC310) | Hardness: HRC60-64 (GCr15SiMn), HB280-320 (Mn13) Radial rated static load: ≥40kN (FC205), ≥130kN (FC310) Impact resistance: Can withstand 2 times rated static load (low-speed impact) Temperature resistance: ≤150℃ (GCr15SiMn), ≤180℃ (Mn13) | Cooperates with inner ring to achieve ultra-radial load bearing, suitable for abrasive-rich working conditions (such as mining machinery, construction machinery) | Interference fit with bearing housing (H7/r6, heavy load); Mn13 outer rings suitable for abrasive-rich scenarios, avoid low-temperature impact; Need regular replenishment of extreme pressure gear oil to prevent dry friction |
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