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Timken Part Number 687 – 672D, Tapered Roller Bearings – TDO (Tapered Double Outer) Imperial

Home TIMKEN BEARING Timken Part Number 687 – 672D, Tapered Roller Bearings – TDO (Tapered Double Outer) Imperial

Timken Part Number 687 – 672D, Tapered Roller Bearings – TDO (Tapered Double Outer) Imperial

The configuration of the TDO provides a wide effective bearing spread, making it ideal for applications in which overturning moments are a significant load component. TDO bearings can be used in fixed positions or allowed to float in the housing bore.

TIMKEN BEARING

Description

Timken  687 – 672D Specifications

Series

 675

Cone Part Number

 687

Cup Part Number

 672D

Design Units

 Imperial

Bearing Weight

 16.33 lb7.405 Kg

Cage Type

 Stamped Steel

Ab – Cage-Cone Frontface Clearance

 0.12 in3 mm

Alternate Part Name

 687-672D

Dimensions

d – Bore

 4.0000 in101.600 mm

D – Cup Outer Diameter

 6.6250 in168.275 mm

B – Cone Width

 1.6250 in41.275 mm

C – Double Cup Width

 2.75 in69.85 mm

T – Bearing Width across Cones

 3.6250 in92.075 mm

Abutment and Fillet Dimensions

R – Cone Backface “To Clear” Radius1 0.14 in3.600 mm
r – Cup Frontface “To Clear” Radius2 0.03 in0.8 mm

db – Cone Backface Backing Diameter

 4.65 in118.10 mm

Da – Cup Frontface Backing Diameter

 6.34 in160.02 mm

Aa – Cage-Cone Backface Clearance

 0.17 in4.3 mm

Basic Load Ratings

C90 – Dynamic Radial Rating (One-Row, 90 million revolutions)3 15400 lbf68600 N
C1 – Dynamic Radial Rating (Two-Row, 1 million revolutions)4 104000 lbf461000 N
C90(2) – Dynamic Radial Rating (Two-Row, 90 million revolutions)5 26900 lbf119000 N
Ca90 – Dynamic Thrust Rating (90 million revolutions)6 12400 lbf55300 N

Factors

K – Factor7 1.24
e – ISO Factor8 0.47
Y1 – ISO Factor9 1.43
Y2 – ISO Factor10 2.14
G1 – Heat Generation Factor (Roller-Raceway)11 182

G2 – Heat Generation Factor (Rib-Roller End)

 37.2
Cg – Geometry Factor12 0.106

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