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TIMKEN 2688-2631 tapered roller bearings

Inside Diameter: 26.988 mm

Outside Diameter: 66.421 mm

Width: 23.813 mm

Basic dynamic load rating: 76.6 kN

Basic static load rating: 81.7 kN

Dimensions
model	2688-2631
Cone Part Number	2688
Cup Part Number	2631
Design Units	Imperial
Cage Type	Stamped Steel
Bearing Weight	0.400 Kg 0.90 lb
d - Bore	26.988 mm 1.0625 in
D - Cup Outer Diameter	66.421 mm 2.6150 in
B - Cone Width	25.433 mm 1.0013 in
C - Cup Width	19.050 mm 0.7500 in
T - Bearing Width	23.813 mm 0.9375 in
Abutment and Fillet Dimensions
R - Cone Backface "To Clear" Radius	1.520 mm 0.06 in
r - Cup Backface "To Clear" Radius	1.27 mm 0.050 in
da - Cone Frontface Backing Diameter	33.02 mm 1.30 in
db - Cone Backface Backing Diameter	35.05 mm 1.38 in
Da - Cup Frontface Backing Diameter	60.96 mm 2.40 in
Db - Cup Backface Backing Diameter	57.91 mm 2.28 in
Ab - Cage-Cone Frontface Clearance	1.5 mm 0.06 in
Aa - Cage-Cone Backface Clearance	0.3 mm 0.01 in
a - Effective Center Location	-9.4 mm -0.37 in
Basic Load Ratings
C90 - Dynamic Radial Rating (90 million revolutions)	19900 N 4470 lbf
C1 - Dynamic Radial Rating (1 million revolutions)	76600 N 17200 lbf
C0 - Static Radial Rating	81700 N 18400 lbf
Ca90 - Dynamic Thrust Rating (90 million revolutions)	8640 N 1940 lbf
Factors
K - Factor	2.3
e - ISO Factor	0.25
Y - ISO Factor	2.36
G1 - Heat Generation Factor (Roller-Raceway)	19.3
G2 - Heat Generation Factor (Rib-Roller End)	8
Cg - Geometry Factor	0.0598