Timken Part Number 740 - 742, Tapered Roller Bearings - TS (Tapered Single) Imperial

Specifications

Series	745
Cone Part Number	740
Cup Part Number	742
Design Units	Imperial
Bearing Weight	3.4 Kg7.5 lb
Cage Type	Stamped Steel

Dimensions

d - Bore	80.963 mm3.1875 in
D - Cup Outer Diameter	150.089 mm5.9090 in
B - Cone Width	46.673 mm1.8375 in
C - Cup Width	36.513 mm1.4375 in
T - Bearing Width	44.450 mm1.7500 in

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1	5.080 mm0.2 in
r - Cup Backface "To Clear" Radius2	3.30 mm0.130 in
da - Cone Frontface Backing Diameter	90.93 mm4.4 in
db - Cone Backface Backing Diameter	101.09 mm3.98 in
Da - Cup Frontface Backing Diameter	142.00 mm5.63 in
Db - Cup Backface Backing Diameter	134.11 mm5.28 in
Ab - Cage-Cone Frontface Clearance	2 mm0.08 in
Aa - Cage-Cone Backface Clearance	1.3 mm0.05 in
a - Effective Center Location3	-11.9 mm-0.47 in

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)4	21900 lbf97600 N
C1 - Dynamic Radial Rating (1 million revolutions)5	84700 lbf377000 N
C0 - Static Radial Rating	93800 lbf417000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6	12200 lbf54400 N

Factors

K - Factor7	1.8
e - ISO Factor8	0.33
Y - ISO Factor9	1.84
G1 - Heat Generation Factor (Roller-Raceway)	160
G2 - Heat Generation Factor (Rib-Roller End)	26.3
Cg - Geometry Factor	0.0898

Tapered roller bearings are rolling element bearings that can support axial forces (i.e., they are good thrust bearings) as well as radial forces.

The inner and outer ring raceways are segments of cones and the rollers are tapered so that the conical surfaces of the raceways, and the roller axes, if projected, would all meet at a common point on the main axis of the bearing. This geometry makes the motion of the cones remain coaxial, with no sliding motion between the raceways and the OD of the rollers.

This conical geometry creates a linear contact patch which permits greater loads to be carried than with spherical (ball) bearings, which have point contact. The geometry means that the tangential speeds of the surfaces of each of the rollers are the same as their raceways along the whole length of the contact patch and no differential scrubbing occurs.

E has different special properties with other inner rings or outer rings marked with the same basic parts code, not interchangeable inner rings or outer rings.

There is a stop ring on the outer diameter of RB