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HM127442/HM127417XD HM127442/HM127419XD Railway train bearings
Both are Boyuan imperial TDO integral double‑cup double‑row tapered roller bearings, share identical cone HM127442 with stamped‑steel cage, AAR‑C derivative railway axle‑box bearing. Double cups HM127417XD and HM127419XD are NOT interchangeable, different OD & overall widthTimken.
‑ HM127442/HM127417XD: double cup HM127417XD, OD 209.873 mm
‑ HM127442/HM127419XD: double cup HM127419XD, OD 219.873 mm
Cone bore d=129.967 mm (5.1168 in). Back‑to‑back construction withstands heavy radial plus bidirectional axial loads, widely used for freight‑car wheelset axle‑boxes, mining, metallurgical rolling‑mill and heavy‑duty gearboxes.
| 项目 Item | 公制 Metric | 英制 Imperial |
|---|---|---|
| 内径 d Bore | 129.967 mm | 5.1168 in |
| 外径 D Outer Diameter | 209.873 mm | 8.2627 in |
| 单内圈宽度 B Cone width | 57.150 mm | 2.2500 in |
| 双外圈总宽 C Double cup width | 132.001 mm | 5.1969 in |
| 装配总宽 T Assembly width | 125.905 mm | 4.9569 in |
| 重量 Weight | 24.70 kg | 54.45 lb |
| 项目 Item | 公制 Metric | 英制 Imperial |
|---|---|---|
| 内径 d Bore | 129.967 mm | 5.1168 in |
| 外径 D Outer Diameter | 219.873 mm | 8.6564 in |
| 单内圈宽度 B Cone width | 57.150 mm | 2.2500 in |
| 双外圈总宽 C Double cup width | 135.001 mm | 5.3150 in |
| 装配总宽 T Assembly width | 128.905 mm | 5.0750 in |
| 重量 Weight | 27.10 kg | 59.74 lb |
TDO one‑piece double‑cup back‑to‑back construction, share cone HM127442. HM127417XD and HM127419XD cups have different OD, must not interchange.
Logarithmic crowned roller profile, excellent shock‑vibration resistance for combined heavy radial & bidirectional axial loads for rough railway service.
Optimized roller‑raceway contact reduces friction & operating temperature, extends grease service interval.
Stamped‑steel cage for heavy‑shock resistance; black‑oxide / phosphating optional.
Precision grades P0/P6/P5 available; clearance C0/C2/C3/C4 optional; open‑type, external sealing unit required for railway service.
