HM129848/ HM129814XD BT2-8516BB TAROL6x11 Railway train bearings

The HM129848 / HM129814XD is a heavy-duty TDO (Tapered Double Outer) double-row inch-sized tapered roller bearing, specially designed for Class E railway wheel set systems. It consists of two separate inner cones (HM129848) and one integral one-piece double outer cup (HM129814XD) with a standard internal spacer. The integrated double-cup structure provides excellent structural rigidity, precise assembly clearance and high running stability, making it the standard fixed-end bearing for heavy-haul railway wheel sets.

Adopting professional railway-grade design and high-purity AISI 52100 bearing steel, this bearing features optimized roller and raceway profiles for uniform stress distribution. It delivers outstanding radial and bidirectional axial load capacity, excellent anti-overturning performance, high impact resistance and long fatigue life. It can steadily withstand harsh railway operating conditions, including heavy cyclic loads, frequent start-stop operations and long-duration continuous running.

This bearing is a universal 6×11 inch railway standard model, equivalent to BT2-8516BB. It is widely used on fixed wheel sets of railway passenger cars and heavy-duty freight cars, ensuring high reliability and long service life for rail transit wheel support systems.

Product Technical Specifications

Inner Diameter (d): 144.450 mm

Outer Diameter (D): 220.663 mm

Assembled Total Width (T): 163.512 mm

Outer Cup Total Width (C): 155.839 mm

Inner Cone Width (B): 58.738 mm

Max Housing Bore Radius (r): 1.000 mm

Bearing Weight: 20.38 kg

Core Advantages

1. One-piece double outer cup structure avoids assembly deviation, improves overall rigidity and running accuracy for wheel set fixed-end installation;

2. Ultra-high heavy-load bearing capacity and strong impact resistance, fully adapted to heavy-haul railway complex stress conditions;

3. Precision optimized internal geometry reduces friction and operating temperature, effectively extending service life and lubrication cycle;

4. Standard international railway specification with high versatility, easy installation, replacement and routine maintenance.

Main Applications

Fixed-end wheel set bearings for railway passenger cars and heavy-duty freight cars, suitable for heavy-haul rail transit wheel set support and chassis bearing systems.