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Tapered roller bearings are built for combined radial and axial load. The rollers and raceways are conical, so the contact angle determines how much axial load the bearing can take: the steeper the angle, the greater the thrust capacity, at some cost in pure radial capacity. Because the cone (inner ring with rollers and cage) is separable from the cup (outer ring), assembly and inspection are straightforward and the two halves can be replaced independently.

Design features

• Combined load capacity — handles radial load together with axial load in one direction; a second bearing, mounted opposed, takes the other direction.
• Separable cone and cup — simpler mounting, and the cup can be fitted into the housing separately.
• Adjustable internal clearance — preload or clearance is set at assembly by axial adjustment, which is what gives this design its stiffness in wheel hubs and pinions.
• High rigidity — line contact between roller and raceway gives a stiffer bearing than a same-size ball bearing, which is why tapered rollers dominate automotive hub and differential duties.

Suffix and arrangement notation

A single-row bearing carries axial load in one direction only, so tapered roller bearings are almost always used in pairs. The common arrangements are:

• Single row (30200, 30300, 32200, 32300 series) — one bearing per position, mounted opposed to a second bearing.
• Matched pairs (DF, DB, DT) — face-to-face, back-to-back or tandem mounting, supplied as a matched set with preload already controlled.
• Inch series (L44643/L44610, LM11749/LM11710 and similar) — for trailer hubs, agricultural and automotive aftermarket, where the inch part number is what the customer quotes.

Series and size range

FRSZC produces the metric tapered roller series below, from roughly 15 mm to 220 mm bore depending on series:

• 30200 series — 30202 to 30230
• 30300 series — 30302 to 30330
• 31300 series — 31305 to 31330
• 32000 series — 32004 to 32044
• 32200 series — 32204 to 32230
• 32300 series — 32304 to 32330
• 32900 series — 32907 to 32944
• 33000 series — 33005 to 33030
• 33100 series — 33105 to 33124

Inch sizes and matched sets are quoted on request. Our tapered bearing set reference guide lists the common SET numbers and the cone/cup pairs behind them.

Mounting and adjustment

For a broader explanation of how the design works, the difference between single row, double row and four-row arrangements, and how to read a tapered bearing part number, see our guide to tapered roller bearing types, uses and maintenance.

Tapered roller bearings are the type most often damaged by incorrect mounting, because the axial setting is part of the installation rather than a property of the bearing. Too little clearance generates heat and rapid failure; too much preload does the same. Setting procedures, torque values and the effect of thermal growth are covered in bearing mounting and lubrication. If a bearing has already failed, common bearing failures and their prevention will usually identify whether the cause was fit, lubrication or adjustment.

Applications

Typical duties are automotive wheel hubs, differentials and pinions, trailer and agricultural hubs, gearbox shafts, rolling mill necks, and spindle assemblies in machine tools. See automotive bearings and coal mining machinery bearings for the load and contamination conditions that drive selection in those sectors.

Selection notes

Choose the series by required life and envelope, not by habit: a 30200 series bearing in the same bore as a 32300 series has far less radial capacity. Where the axial load is large or the shaft deflects, a steeper contact angle or a matched pair is the right answer rather than a larger bearing of the same angle. Our engineers will run the life calculation against your load spectrum on request.

Why buy these bearings from FRSZC

Shanghai Furuisheng Precision Bearing Co., Ltd. runs turning, heat treatment, grinding, assembly and inspection in one plant of more than 3,000 square metres in Baoshan District, Shanghai. Eight automatic grinding lines and an annual output above one million sets let us hold tolerance batch after batch instead of checking it afterwards. We currently export to Europe and the Middle East and act as a bearing supporting unit for FAW Group.

Common sizes are held in stock for short lead times. For non-standard sizes, special cages, matched sets or private-label packing, send the drawing and we will confirm the specification, the tolerance class and the delivery date before you commit to an order.

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