HM133444/ HM133416XD BT2-8512BB TAROL6-1/2X12 Railway train bearings

Engineered for extreme heavy-haul railway operating conditions, the HM133444 / HM133416XD is a premium inch-series double-row tapered roller bearing with a TDO configuration. This bearing assembly consists of two separate inner cone components and a rigid monolithic double outer cup, paired with a precision-fit internal spacer to guarantee consistent spacing and reliable integrated performance. Designed exclusively for the fixed-end position of rail vehicle wheel sets, it excels at handling complex combined loads that are common in

Crafted from ultra-pure AISI 52100 bearing steel with rigorous heat treatment, this wheel set bearing boasts exceptional surface hardness and structural toughness. Its finely polished raceways and precisely contoured rollers minimize contact friction and stress concentration, enabling the unit to withstand intense vibration, frequent impact loads, and prolonged continuous operation. Capable of sustaining large radial pressure and dual-direction axial thrust simultaneously, it delivers superior structural stability and remarkable fatigue resistance, drastically reducing failure risks under rigorous and variable railway working environments.

Featuring a 6.5×12 inch industry standard dimension, this bearing is a core component for heavy-duty rail transit equipment with excellent universal adaptability. It is extensively deployed on the fixed wheel sets of modern railway freight vehicles with large load capacity and mainstream passenger car fleets, offering durable, low-maintenance and high-safety support for entire wheel system operation.

Complete Technical Parameters

Inner Diameter (d): 157.150 mm

Outer Diameter (D): 252.413 mm

Assembled Total Width (T): 184.150 mm

Max Shaft Shoulder Radius (R): 1.524 mm

Outer Cup Total Width (C): 171.450 mm

Inner Cone Width (B): 66.675 mm

Bearing Weight: 31.64 kg

1. Integrated double outer cup construction enhances overall structural integrity, effectively resists deformation under heavy loads and ensures precise wheel set rotation;

2. Class-leading load-bearing performance, specially optimized for ultra-heavy haul railway routes with large vehicle traction and load capacity;

3. Low-friction structural design suppresses heat accumulation during long-term operation, extending service life and reducing equipment maintenance frequency;

4. Standardized railway industry specifications guarantee perfect compatibility with mainstream rail vehicle wheel set assemblies, easy for global aftermarket replacement.

Application Scenarios

Widely applied in fixed-end wheel set assemblies for heavy-load railway freight wagons and passenger transit vehicles. It is the core supporting component for high-loa