Application: Widely used in automobiles, machine tools, motors and many other industrial fields, it is an indispensable and important part in mechanical transmission.

Tapered roller bearing model system is complex, according to the structure, size, brand can be divided into several series. The following are the main classification and representative models:
🔧 I. According to the structure classification

Single row Tapered Roller Bearings

Characteristics: only bear one-way axial load, need to be used in pairs.
Representative models: 
standard type: 30207 (ID 35mm), 30310 (ID 50mm) 
large contact angle type: 32008 (contact angle 29 °), 33206 (contact angle 32 °), axial bearing capacity is stronger.

Double row tapered roller bearings

Characteristics: Compact structure, self-contained preload clearance, support bidirectional axial load.
Representative models: 
General-purpose type: HR30312J (commonly used in automotive wheels) 
High-load type: 31330 (for rolling mills).

Four-row tapered roller bearings

Features: designed for heavy industry, such as rolling mills, mining machinery.
Representative models: 
313403C (OD 710mm, weight 1860kg) 
310/560X2 (OD 560mm).
📐 Second, according to the size series (ISO standardisation)

Bearing type usually contains Type code + size series + inner diameter code:

Type designation: 3 (tapered roller bearings) 
Size series: width/diameter combination (e.g. 02 means light and narrow series) 
Bore designation: 
04=20mm, 12=60mm (Bore = designation x 5) 
00=10mm, 03=17mm (special case for small size) .

Examples of common size series models:

Size series Inner diameter range Representative model 
02 series 15-40mm 30204 (20mm) 
03 series 45-100mm 30310 (50mm) 
22 series 110-200mm 32220 (100mm) 
31 series 220mm or more 31328 (140mm) .
⚙️ III. Special Structure Models 
Enhanced (E-type) 
Suffix marked E (e.g. 33217E): Increase the number/size of rollers to enhance the load capacity by 20%-40%.
High precision grade 
Suffix P6/P5 (e.g. 30312JP5): Specialised for precision machine tool spindles with higher tolerance grade.
Sealed 
Suffix 2RS (e.g. 32005-2RS): double rubber seals, dustproof for mining machinery.
🏷️ IV. Mainstream brand model differences 
Brand Model Features Example 
SKF Suffix B for large cone angle (>25°) 32008B (contact angle 29°) 
FAG X-life technology to optimise friction T7FC055 (for rolling mills) 
NSK HR High Load Series HR30312J (174kN) .
⚠️ Selection Notes 
Contact angle determines load carrying direction: 
Conventional contact angle 10°-19° (e.g. 30310); large cone angle >25° (e.g. 32008B) Axial load carrying is increased by 3 times.
Suffix code meaning: 
C3: large clearance (for high temperature scenes); 
J: ISO standardised dimensions (interchangeability).
Pairing rules: 
single row bearings need to be installed in pairs (such as 30207 + 30207 back to back), the suffix DB means pre-paired (such as 7210A DB).

If you need specific working conditions selection suggestions (such as rolling mill / automobile wheel hub), you can provide parameters for further matching.