Inch and metric sized tapered roller bearings are designed to carry maximum combinations of radial and thrust loads simultaneously.
ET (Endurance Tapered) bearings use a high quality carburized steel and unique heat-treating process to greatly increase
durability and extend life span.
4T bearings are manufactured from a special grade of case hardened steel and heat treated for maximum useful life.
Sized from 0.6250" (16 mm) inside diameter to 10.1250" (257 mm) outside diameter. Metric ISO sizes from 15 mm inside diameter
to 160 mm outside diameter.
Tapered roller bearings consist of an inner ring (cone), an outer ring (cup),
a cage and rollers which are profiled to distribute the load evenly. They have high radial and axial (thrust) load capacities
at low to intermediate speeds. Tapered roller bearings are available in single-row, two-row and four-row designs. With single-row
bearings, the thrust load capacity is about 60% of the radial capacity. Double-row bearings have a greater radial load capacity
and can handle thrust loads from both directions. The rollers can be configured so that the contact lines to the races converge
or diverge towards the axis of rotation. Diverging double-row bearings increase the rigidity of the shaft mounting, but converging
bearings do not. Other configurations for double-row bearings feature a single outer ring and two inner rings, or two outer
rings and a single inner ring. Four-row tapered roller bearings consist of four rows of alternating converging and diverging
Most tapered roller bearings are made of alloy steels or low-carbon steels. Some applications require
the use of case-hardened or thorough-hardened, high-carbon, bearing-quality steel. High-carbon grades of steel do not require
carburizing and can be case-hardened by induction heating or thorough-hardened by conventional heating methods. When low-carbon,
carburized grades of steel are used, carbon is introduced after the cylindrical roller bearings are machined to a depth sufficient
to produce a hardened case that can sustain bearing loads. The addition of carbon and alloys ensures the proper combination
of a hard, fatigue-resistant case and a tough, ductile core.
Bore size and outside diameter (OD) are important specifications to consider
when selecting tapered roller bearings. The bore size is the bearing’s smallest dimension. The outer diameter includes
the bearing housing, but excludes the flange. Other important specifications for tapered roller bearings include overall width,
rated speed (oil), static axial load, static radial load, dynamic axial load, and dynamic radial load. Static axial load and
static radial load are, respectively, the maximum axial and radial loads that bearings can withstand without permanent deformation.
Dynamic axial load and dynamic radial load are, respectively, the calculated axial and radial loads under which a group of
identical bearings with stationary outer rings can endure for a rating life of 1 million revolutions of the inner ring.