Part Number HM212049 - HM212011, Tapered Roller Bearings - TS (Tapered Single) Imperial

This is the most basic and most widely used type of tapered roller bearing. It consists of two main separable parts: the cone (inner ring) assembly and the cup (outer ring). It is typically mounted in opposing pairs on a shaft.

HM212049HM212011-1

Specifications

Series	HM212000
Cone Part Number	HM212049
Cup Part Number	HM212011
Design Unit	Inch
Bearing Weight	4.1 lb1.8 Kg
Cage Material	Stamped Steel

Dimensions

d - Bore	2.6250 in66.675 mm
D - Cup Outer Diameter	4.8125 in122.238 mm
B - Cone Width	1.5100 in38.354 mm
C - Cup Width	1.1700 in29.718 mm
T - Bearing Width	1.5000 in38.100 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius¹	0.14 in3.560 mm
r - Cup Backface "To Clear" Radius²	0.130 in3.3 mm
da - Cone Frontface Backing Diameter	2.97 in75.5 mm
db - Cone Backface Backing Diameter	3.23 in82 mm
Da - Cup Frontface Backing Diameter	4.60 in116.10 mm
Db - Cup Backface Backing Diameter	4.25 in107.95 mm
Ab - Cage-Cone Frontface Clearance	0.15 in3.8 mm
Aa - Cage-Cone Backface Clearance	0.07 in1.8 mm
a - Effective Center Location³	-0.43 in-10.9 mm

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
C_a90 - 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 Factor¹⁰	0.0759

¹ These maximum fillet radii will be cleared by the bearing corners.
² These maximum fillet radii will be cleared by the bearing corners.
³ Negative value indicates effective center inside cone backface.
⁴ Based on 90 x 10⁶ revolutions L₁₀ life, for The Timken Company life calculation method. C₉₀ and C_a90 are radial and thrust values.
⁵ Based on 1 x 10⁶ revolutions L₁₀ life, for the ISO life calculation method.
⁶ Based on 90 x 10⁶ revolutions L₁₀ life, for The Timken Company life calculation method. C₉₀ and C_a90 are radial and thrust values for a single-row, C₉₀₍₂₎ is the two-row radial value.
⁷ These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
⁸ These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
⁹ These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
¹⁰ Geometry constant for Lubrication Life Adjustment Factor a3l.