Tapered Roller Bearings – Double Tapered Cones – Imperial

Tapered Roller Bearings Product Introduction

**TIMKEN Tapered Roller Bearings – Double Cones (Imperial Series 271): Engineered for Heavy-Duty Performance**

For over a century, TIMKEN has set the global standard for tapered roller bearing technology, delivering unmatched reliability in the most demanding industrial and automotive applications. Among its robust portfolio, the **TIMKEN Double Tapered Cones (Imperial Series 271)** stand out as a high-performance solution designed to handle heavy radial and thrust loads simultaneously. These precision-engineered bearings combine advanced metallurgy, optimized geometry, and rigorous manufacturing tolerances to extend equipment life, reduce maintenance costs, and enhance operational efficiency across critical machinery.

### **Technical Features & Design Advantages**
The **Series 271 Double Tapered Cones** are crafted for applications requiring superior load distribution and alignment flexibility. Key features include:

– **Dual-Row Design**: Two independent cone assemblies enable balanced load sharing, accommodating combined radial and axial forces in a compact footprint.
– **Premium Steel Alloys**: Manufactured from ultra-clean, case-hardened steel for exceptional fatigue resistance and durability under shock loads or high-speed conditions.
– **Precision Ground Surfaces**: Optimized roller profiles and raceway finishes minimize friction, heat generation, and wear, even in misalignment scenarios.
– **Interchangeability**: Conforms to imperial dimensions for seamless integration with existing systems, reducing downtime during replacements.
– **Sealing & Lubrication Options**: Compatible with TIMKEN’s advanced sealing solutions (e.g., labyrinth or contact seals) and specialty greases for contaminated environments.

### **Performance Benefits**
TIMKEN’s double cones excel where single-row bearings fall short, offering:
– **Higher Load Capacity**: The dual-row configuration distributes loads evenly, making them ideal for applications with oscillating or variable force directions.
– **Extended Service Life**: Reduced stress concentrations and improved lubrication retention lead to longer intervals between overhauls.
– **Versatility**: Performs reliably in both slow-speed, high-torque environments (e.g., conveyor pulleys) and high-speed applications (e.g., gearbox systems).

### **Typical Applications**
The **Series 271 Double Tapered Cones** are widely specified in heavy industries, including:
– **Industrial Machinery**: Crushers, extruders, and mining equipment where shock loads and misalignment are common.
– **Automotive Systems**: Wheel hubs, differentials, and drivetrains in commercial vehicles and off-highway equipment.
– **Precision Equipment**: Wind turbine gearboxes, rolling mill stands, and pulp/paper processing machinery requiring sustained performance under extreme conditions.

Engineered to exceed industry benchmarks, TIMKEN’s Double Tapered Roller Bearings deliver the strength, precision, and longevity needed to keep critical systems running smoothly. Whether in harsh environments or precision-driven applications, they represent a proven investment in reduced downtime and total cost of ownership.

*For specific dimensions, load ratings, or customization options, consult TIMKEN’s engineering resources or product catalogs.*

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Part Number Series d - Cone Bore B - Double Cone Width C1 - Dynamic Radial Rating(1 million revolutions) C0 - Static Radial Rating
HM252348D
HM252300
260.350 mm
152.400 mm
1500000 N
2020000 N
HM252348DW
HM252300
260.350 mm
152.400 mm
1500000 N
2020000 N
HM252349D
HM252300
260.350 mm
152.400 mm
1550000 N
2110000 N
HM256847DWH
HM256800
288.925 mm
150.813 mm
1430000 N
2610000 N
HM256848DWH
HM256800
298.450 mm
150.813 mm
1430000 N
2610000 N
HM256849D
HM256800
300.038 mm
150.813 mm
1300000 N
2770000 N
HM256849DA
HM256800
300.038 mm
150.813 mm
1300000 N
2770000 N
HM256849DW
HM256800
300.038 mm
150.813 mm
1300000 N
2770000 N
HM259047DW
HM259000
317.500 mm
158.750 mm
1540000 N
2790000 N
HM259049D
HM259000
317.500 mm
158.750 mm
1680000 N
3140000 N
HM259049DH
HM259000
317.500 mm
158.750 mm
1680000 N
3140000 N
HM259049DV
HM259000
317.500 mm
158.750 mm
1680000 N
3140000 N
HM259049DW
HM259000
317.500 mm
158.750 mm
1680000 N
3140000 N
HM261049DW
HM261000
333.375 mm
166.688 mm
1600000 N
3460000 N
HM261049DWH
HM261000
333.375 mm
166.688 mm
1690000 N
3070000 N
HM262749D
HM262700
346.075 mm
174.625 mm
1730000 N
3760000 N
HM262749DG
HM262700
346.075 mm
174.625 mm
1730000 N
3760000 N
HM265049DGW
HM265000
368.3 mm
185.738 mm
2270000 N
4340000 N
HM265049DW
HM265000
368.3 mm
185.738 mm
2270000 N
4340000 N
HM266449DGW
HM266400
384.175 mm
193.675 mm
2460000 N
4730000 N
HM266449DW
HM266400
384.175 mm
193.675 mm
2460000 N
4730000 N
HM959737DW
HM959700
305.036 mm
200.000 mm
1360000 N
2540000 N
HM959738DW
HM959700
305.034 mm
200.025 mm
1360000 N
2540000 N
HM959739DW
HM959700
305.034 mm
200.025 mm
1360000 N
2540000 N