SKF 51128 thrust ball bearing. Single-direction (51xxx) or double-direction (52xxx) thrust ball bearing designed to carry pure axial load at moderate speed. Cannot carry radial load. Series 511/512/513/514 covers the standard boundary plans. Manufactured to ISO 104 / ISO 492 Class Normal. Bore diameter d = 140 mm per ISO 15. Boundary plan per ISO 15 / ISO 355: bore d = 140 mm, outside diameter D = 180 mm, width B (or height H) = 31 mm.
| Type | Thrust ball bearing |
| Designation | SKF 51128 |
| Standard | ISO 15 / DIN 623 dimension plan; ISO 492 Class Normal precision |
| Bore d | 140 mm |
| HS code | 8482.10 |
| Outside diameter D | 180 mm |
| Width B / Height H | 31 mm |
| Bore diameter | 140 mm |
| Outside diameter | 180 mm |
| Height | 31 mm |
| Basic dynamic load rating | 111 kN |
| Basic static load rating | 440 kN |
| Reference speed | 1800 r/min |
| Limiting speed | 2600 r/min |
| Axial load capability | Single-direction |
| Number of rows | 1 |
| Cage | Sheet metal |
| Housing washer type | Flat |
| Tolerance class | Normal |
| Material, bearing | Bearing steel |
| Coating | Without |
| Indicative carbon footprint for new product | 6.9 kg CO2e |
| Product net weight | 1.86 kg |
| eClass code | 23-05-10-01 |
| UNSPSC code | 31171507 |
| Material | Bearing steel — 100Cr6 (through-hardened) or SNR-nitrided; cage as declared by suffix |
| Temperature range | -30 to +120 °C standard grease |
| Primary standard | ISO 15 / ISO 492 / DIN 623 |
| Dimensions | 140 × 180 × 31 mm (bore d × OD D × width B / height H) |
| MOQ | 1 |
ISO 15 boundary-plan interchange — the numeric bore-code block is portable across every ISO 15 bearing manufacturer (SKF, Timken, NSK, NTN, FAG, Koyo, NACHI). Confirm suffix compatibility on cage, seal, clearance and precision class before substitution.