QJ Series (Four-Point Contact)
Material: Chrome Steel (Gcr15)
Contact Angle: 35° (Bi-directional)
Precision: P0, P6, P5, P4
Structure: Single Row / Four-Point Contact / Split Inner Ring
Cage: Brass / Phenolic Resin
Clearance: C2, C0, C3
Bore Range: 20mm – 300mm
Application: Axial location bearings, ball screw support, crane slewing rings
WhatsApp: +86 18663551233
Get a Quote
The QJ Series four-point contact ball bearings feature a split inner ring design enabling true bidirectional axial load support from a single bearing. The unique raceway geometry creates four distinct contact points under axial load, providing axial location capability equivalent to a matched pair in half the axial space. Ideal for ball screw support bearings, crane slewing applications, and precision axial positioning systems.
Technical Specifications
| Bearing No. | Bore (d) mm | Outer Dia. (D) mm | Width (B) mm | Dyn. Load Cr (kN) | Stat. Load Cor (kN) | Ref. Speed (rpm) | Weight (kg) |
|---|---|---|---|---|---|---|---|
| QJ206 | 30 | 62 | 16 | 22.5 | 18.5 | 11000 | 0.23 |
| QJ208 | 40 | 80 | 18 | 35.5 | 29.5 | 9000 | 0.42 |
| QJ210 | 50 | 90 | 20 | 39.0 | 34.0 | 8000 | 0.55 |
| QJ212 | 60 | 110 | 22 | 56.0 | 50.0 | 6700 | 0.89 |
| QJ214 | 70 | 125 | 24 | 68.0 | 63.0 | 6000 | 1.25 |
| QJ216 | 80 | 140 | 26 | 79.0 | 75.0 | 5300 | 1.65 |
| QJ218 | 90 | 160 | 30 | 105.0 | 100.0 | 4500 | 2.6 |
| QJ306 | 30 | 72 | 19 | 31.5 | 27.0 | 9500 | 0.38 |
| QJ308 | 40 | 90 | 23 | 49.0 | 44.0 | 7500 | 0.71 |
| QJ310 | 50 | 110 | 27 | 76.0 | 70.0 | 6300 | 1.25 |
| QJ312 | 60 | 130 | 31 | 95.0 | 90.0 | 5000 | 2.0 |
| QJ314 | 70 | 150 | 35 | 115.0 | 115.0 | 4300 | 2.8 |
| QJ316 | 80 | 170 | 39 | 140.0 | 145.0 | 3600 | 4.2 |
| QJ318 | 90 | 190 | 43 | 175.0 | 185.0 | 3200 | 5.5 |
| QJ405 | 25 | 80 | 21 | 60.0 | 48.0 | 8500 | 0.7 |
| QJ408 | 40 | 110 | 27 | 90.0 | 78.0 | 6700 | 1.4 |
| QJ410 | 50 | 130 | 31 | 115.0 | 105.0 | 5600 | 2.1 |
