C3988KM Bore 440 Mm, CARB Toroidal Roller Bearings
The C3988KM CARB ring roller bearings are widely used in continuously operating equipment where misalignment and thermal expansion occur, specifically including: papermaking machinery (drying cylinders, calenders), wind power generation (main shafts), industrial gearboxes, continuous casting lines, ship propulsion shafts, and large wind turbines.
The C3988KM bearing is a CARB toroidal roller bearings with an inner diameter of 440 mm , an outer diameter of 600 mm, a width of 118 mm. It typically uses PN grade precision tolerances and GCr15SiMn rings, GCr15SiMn rolling mlement. Its dynamic radial rated load is approximately 2596811 N, its static radial rated load is approximately 5295240 N. It uses CN standard radial clearance, Open type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
C3988KM bearings ( 440 mm x 600 mm x 118 mm) have the advantages of Self-aligning + displacement, high load capacity, long service life, and are therefore widely used in the Papermaking machinery, wind turbines, industrial gearboxes, material conveying equipment and vibrating screens.
| Part Number | C3988KM |
| Interchangeable | SKF C3988KM |
| Cage | M = a machined brass cage, window-type, roller centred |
| Bearing Type | CARB toroidal roller bearings |
| Load | radial |
| Accuracy class | PN |
| Bearing part | Complete |
| Internal clearance | CN |
| Row NO. | One |
| Heat stabilized | 200 °C (390 °F) |
| Seal | Open |
| Units | Metric |
| Manufacturer Part Code | C 3988 KM |
| Series | C39 series (C39..KM) |
| Lubrication | NO |
| Locating feature | NO |
| Relubrication feature | NO |
| Weight [lb] | 218.2554 |
| Cr Radial Dynamic [lbf] | 583763 |
| C0r Radial Static [lbf] | 1190369 |
| Pu Fatigue load limit [lbf] | 83986 |
| nB Speed ratings (grease) [rpm] | 761 |
| nG Speed ratings (oil) [rpm] | 1051 |
| d φ Inside [inch] | 17.3228 |
| D Φ Outside [inch] | 23.6220 |
| B Thickness [inch] | 4.6457 |
| r1,2 min Chamfer [inch] | 0.1575 |
| d2 [inch] | 19.4488 |
| D1 [inch] | 22.0472 |
| s1 max. Permissible axial displacement [inch] | 0.7874 |
| ra max Radius of fillet [inch] | 0.1181 |
| Da min [inch] | 21.4960 |
| da min [inch] | 17.9134 |
| Da max [inch] | 23.031 |
| da max [inch] | 20.354 |
| Ca min. [inch] | 0.075 |
| k1 Misalignment Coefficient | 0.133 |
| k2 Internal clearance Coefficient | 0.095 |
The C3988KM CARB ring roller bearings consist of an inner ring (with double raceways), a spherical outer ring, ring rollers (symmetrical rollers with a special profile), and a cage. The outer ring raceways are spherical, and the rollers are arranged in a ring, combining the structural characteristics of self-aligning roller bearings and cylindrical roller bearings.
CARB ring roller bearings integrate self-aligning capability and axial displacement capability, compensating for shaft bending and misalignment (self-aligning function) while allowing bidirectional axial displacement between the shaft and the bearing housing (floating function). They have extremely high radial load capacity, with line contact between the rollers and raceways, resulting in uniform stress distribution. Their compact structure allows them to replace the combination of self-aligning roller bearings and floating end bearings, simplifying system design.
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