Timken Part Number HM212049X - HM212011, Tapered Roller Bearings - TS (Tapered Single) Imperial

Specifications

Series	HM212000
Cone Part Number	HM212049X
Cup Part Number	HM212011
Design Units	Imperial
Bearing Weight	1.8 Kg4 lb
Cage Type	Stamped Steel

Dimensions

d - Bore	66.675 mm2.6250 in
D - Cup Outer Diameter	122.238 mm4.8125 in
B - Cone Width	38.354 mm1.5100 in
C - Cup Width	29.718 mm1.1700 in
T - Bearing Width	38.097 mm1.4999 in

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1	7.110 mm0.280 in
r - Cup Backface "To Clear" Radius2	3.30 mm0.130 in
da - Cone Frontface Backing Diameter	75.44 mm3.58 in
db - Cone Backface Backing Diameter	88.90 mm3.5 in
Da - Cup Frontface Backing Diameter	116.10 mm4.60 in
Db - Cup Backface Backing Diameter	107.95 mm4.25 in
Ab - Cage-Cone Frontface Clearance	3.8 mm0.15 in
Aa - Cage-Cone Backface Clearance	1.8 mm0.07 in
a - Effective Center Location3	-10.9 mm-0.43 in

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)4	15600 lbf69200 N
C1 - Dynamic Radial Rating (1 million revolutions)5	60000 lbf267000 N
C0 - Static Radial Rating	62700 lbf279000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6	8990 lbf40000 N

Factors

K - Factor7	1.73
e - ISO Factor8	0.34
Y - ISO Factor9	1.78
G1 - Heat Generation Factor (Roller-Raceway)	92.2
G2 - Heat Generation Factor (Rib-Roller End)	18.1
Cg - Geometry Factor	0.0759

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