HM127446/HM127415XD BT2-8547 TAROL5-1/2X10 F-809501Railway train bearings

HM127446 / HM127415XD is a TDO (Tapered Double Outer) double‑row inch‑size tapered roller bearing, widely adopted as railway wheel‑set bearing for freight and passenger rolling stockTimken.

This unit consists of two separate inner cones HM127446 and one‑piece double cup HM127415XD, assembled with internal spacer. The TDO structure enables the bearing to carry heavy radial load and bidirectional axial load simultaneously, and resist overturning moment for wheel‑set fixed‑end installationTimken.

Manufactured with high‑strength bearing steel, optimized internal raceway geometry and stamped steel cage, it delivers high load capacity, stable running performance and long service life under harsh railway operating conditions. It can withstand heavy impact load, frequent start‑stop and variable‑speed working scenarios.

Basic Technical Data

• Inner diameter d: 131.750 mm

• Outer diameter D: 207.963 mm

• Assembled total width T: 146.304 mm

• Basic dynamic load rating C₁: 732000 N

• Weight: 16.89 kg

• Factor e: 0.26; K=2.21; Y₁=2.55

Equivalent Designation: TAROL 5‑1/2×10‑U‑JP, BT2‑8547 BB.

Typical Application: Railway wagon and passenger car wheel‑set fixed‑end bearing for heavy‑duty rail transit equipment.