NU31/630-M-C4 Cylindrical Roller Bearings With Solid Brass Cage, Two-piece
The NU31/630-M-C4 Single-row cylindrical roller bearings are widely used for radial support in various rotating machinery, such as: motors (large and medium-sized motor rotors), gearboxes (industrial gearboxes), machine tool spindles, compressors, pumps, and wind turbine spindles.
The NU31/630-M-C4 bearing is a Single row cylindrical roller bearings with cage with an inner diameter of 630 mm , an outer diameter of 1030 mm, a width of 315 mm. It typically uses P6 grade precision tolerances and GCr15SiMn rings, GCr15SiMn rolling mlement. Its dynamic radial rated load is approximately 9149847 N, its static radial rated load is approximately 17998772 N. It uses C4 standard radial clearance, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
NU31/630-M-C4 bearings ( 630 mm x 1030 mm x 315 mm) have the advantages of High radial load capacity and high speed performance, and are therefore widely used in the Electric motors, machine tool spindles, gearboxes, rolling mills, railway vehicle axle boxes, and industrial pumps and compressors.
| Part Number | NU31/630-M-C4 |
| Design | 3 |
| Bearing Type | Single row cylindrical roller bearings with cage |
| Rows NO. | 1 |
| Series | NU31 |
| Type | NU |
| Running accuracy | P6 |
| Bore Type | Z = Cylindrical Bore |
| Cage type | M = Solid brass cage, two-piece, roller-guided |
| Ring type | outer ring(2), inner ring(0)(smooth) |
| Radial internal clearances | C4 |
| Manufacturer Part Code | NU31/630M |
| Alias | Non-locating bearings |
| Tolerance class | PN |
| Cr Radial Dynamic[lbf] | 2056885 |
| C0r Radial static[lbf] | 4046123 |
| Cur Radial Fatigue[lbf] | 321369 |
| nG Limiting speed[rpm] | 868 |
| nB Reference speed[rpm] | 245 |
| Operating temperature - T(min)[°C] | –30 |
| Operating temperature - T(max)[°C] | +150 |
| Bearing Mass - m[lb] | 2314.830 |
| Dimensions | |
| d φ Inside[inch] | 24.803 |
| D Φ Outside[inch] | 40.551 |
| B Width[inch] | 12.402 |
| s[inch] | 1.075 |
| E[inch] | 37.283 |
| F[inch] | 28.622 |
| D1[inch] | 35.898 |
| r(min.)[inch] | 0.295 |
| r1(min.)[inch] | 0.295 |
| Mounting dimensions | |
| da(max.)[inch] | 28.425 |
| da(min.)[inch] | 26.063 |
| db(min.)[inch] | 28.819 |
| Da(max.)[inch] | 39.291 |
| ra(max.)[inch] | 0.236 |
| ra1(max.)[inch] | 0.236 |
The NU31/630-M-C4 Single-row cylindrical roller bearings mainly consist of an inner ring, an outer ring, cylindrical rollers, and a cage. Common structural forms include NU type (double-flange outer ring, no flange on inner ring), N type (double-flange inner ring, no flange on outer ring), and NJ type (single-flange inner ring), enabling separable design and axial displacement compensation.
Single-row cylindrical roller bearings have extremely high radial load capacity. The rollers and raceways have line contact, making them suitable for heavy-duty applications. They have a low coefficient of friction, making them suitable for high-speed operation. The separable structure facilitates easy installation and disassembly. NU and N types allow axial displacement and can be used as floating end bearings to effectively compensate for thermal expansion.
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