NNU4988 KOYO Double-row cylindrical roller bearings
| Brand Name: | KOYO |
| Model Number: | NNU4988 |
| Series: | 18000 |
| Cone Part Number: | 18200 |
| Cup Part Number: | 18337 |
| Design Units: | Imperial |
| Bearing Weight: | 0.4 Kg |
| Cage Type: | Stamped Steel |
| d: | 50.8 mm |
| D: | 85.725 mm |
| PDF |
NNU4988 |
Product Details
| Series | 18000 |
| Cone Part Number | 18200 |
| Cup Part Number | 18337 |
| Design Units | Imperial |
| Bearing Weight | 0.4 Kg |
| Cage Type | Stamped Steel |
| d | 50.8 mm |
| D | 85.725 mm |
| B - Cone Width | 18.263 mm |
| C - Cup Width | 12.700 mm |
| B | 19.050 mm |
| R - Cone Backface To Clear Radius1 | 1.520 mm |
| r - Cup Backface To Clear Radius2 | 1.52 mm |
| da - Cone Frontface Backing Diameter | 55.88 mm |
| db - Cone Backface Backing Diameter | 58.93 mm |
| Da - Cup Frontface Backing Diameter | 82.00 mm |
| Db - Cup Backface Backing Diameter | 75.95 mm |
| Ab - Cage-Cone Frontface Clearance | 2.3 mm |
| Aa - Cage-Cone Backface Clearance | 1.8 mm |
| a - Effective Center Location3 | 2 mm |
| C90 - Dynamic Radial Rating (90 million revolutions)4 | 3560 lbf |
| C1 - Dynamic Radial Rating (1 million revolutions)5 | 13700 lbf |
| C0 - Static Radial Rating | 14400 lbf |
| Ca90 - Dynamic Thrust Rating (90 million revolutions)6 | 3470 lbf |
| K - Factor7 | 1.03 |
| e - ISO Factor8 | 0.57 |
| Y - ISO Factor9 | 1.06 |
| G1 - Heat Generation Factor (Roller-Raceway) | 26.1 |
| G2 - Heat Generation Factor (Rib-Roller End) | 20.3 |
| Cg - Geometry Factor | 0.0852 |
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