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Four point contact bearing ring
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Four point contact bearing ring
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Four point contact bearing ring
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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 |
| Four-point Contact Ball Type | Four-point Contact Ball Bearing Inner Ring | - Bearing steel (GCr15SiMn, general purpose) - Stainless steel (440C, corrosion-resistant) - High-temperature bearing steel (GCr15SiMo, high-temperature) | GB/T 294 Examples: QJ205 inner ring, QJ210 inner ring, QJ315 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, 21, 28 Bore roundness: ≤0.002mm (Class P4), ≤0.004mm (Class P5), ≤0.008mm (Class P0) Raceway curvature radius (R1): 6.5±0.1 (QJ205), 13±0.1 (QJ210) | Hardness: HRC60-64 (GCr15SiMn), HRC58-62 (440C) Contact fatigue life: ≥2000h (rated load, GCr15SiMn) Surface roughness: Ra≤0.1μm (raceway surface), Ra≤0.2μm (end face) Temperature resistance: ≤150℃ (GCr15SiMn), ≤300℃ (440C), ≤250℃ (GCr15SiMo) | Precision machine tool spindles (bidirectional axial positioning), robot joints (light load, high speed), wind turbine yaw systems (low speed, heavy load), suitable for scenarios dominated by bidirectional axial loads | Interference fit with shaft (H7/k5, light load), H7/m5 (medium load); Raceways require symmetrical precision grinding (double contact point deviation ≤0.003mm); GCr15SiMn requires integral quenching + low-temperature tempering (150-180℃) |
| Four-point Contact Ball Type | Four-point Contact Ball Bearing Outer Ring | - Bearing steel (GCr15SiMn, general purpose) - Stainless steel (440C, corrosion-resistant) - Ceramic composite (Al₂O₃, lightweight) | GB/T 294 Examples: QJ205 outer ring, QJ210 outer ring, QJ315 outer ring | Outer diameter (D): 52 (h6), 90 (h6), 130 (h6) Inner raceway diameter (D1): 42 (H7), 78 (H7), 110 (H7) Width (B): 14, 21, 28 Outer diameter roundness: ≤0.003mm (Class P4), ≤0.005mm (Class P5), ≤0.01mm (Class P0) Raceway curvature radius (R2): 6.5±0.1 (QJ205), 13±0.1 (QJ210) | Hardness: HRC60-64 (GCr15SiMn), HRC58-62 (440C) Axial rated dynamic load: ≥35kN (QJ205), ≥85kN (QJ210), ≥150kN (QJ315) Radial internal clearance: 0.006-0.02mm (Group C3), 0.012-0.028mm (Group C4) Impact resistance: Can withstand 1.5 times rated static load (instantaneous axial impact) | Cooperates with inner ring to achieve bidirectional axial load bearing, suitable for dusty/humid working conditions (such as textile machinery winding shafts), precision equipment (such as radar antenna mounts) | 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 spindles); Outer ring can have seal grooves (3-5mm wide) for double-sided rubber seals (2RS) |
| Four-point Contact Ball Type (Flanged) | Flanged Four-point Contact Ball Bearing Outer Ring | - Bearing steel (GCr15, medium-heavy load) - Carburized steel (20CrNiMoA, high impact) - Stainless steel (316L, mild corrosion) | GB/T 294 (flanged type) Examples: FQJ208 outer ring, FQJ212 outer ring | Outer diameter (D): 68 (h6), 110 (h6) Flange diameter (Df): 78 (h8), 125 (h8) Flange thickness (tf): 5 (FQJ208), 7 (FQJ212) Inner raceway diameter (D1): 56 (H7), 92 (H7) Raceway contact angle (α): 40° (fixed) | Hardness: HRC60-64 (GCr15), HRC58-62 (20CrNiMoA carburized) Axial rated static load: ≥42kN (FQJ208), ≥105kN (FQJ212) Temperature resistance: ≤150℃ (GCr15), ≤200℃ (20CrNiMoA) Deformation resistance: Axial elastic deformation ≤0.002mm/kN at room temperature | Heavy-duty bidirectional axial load scenarios, such as heavy machine tool worktables, mining machinery hoisting shafts, ship propulsion system auxiliary bearings | Flange surface flatness ≤0.01mm (Class P4); Interference fit with bearing housing (H7/r6, heavy load); Carburized layer depth 1.0-1.5mm (20CrNiMoA) to enhance raceway wear resistance |
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