Aerospace / Military
Aerospace Series General Aviation Rod Ends Spherical Bearings Mil Spec Series Rod Ends Spherical Bearings Bushings Approved Part Numbers
Commercial / Industrial
Rod End Bearings Inch Rod Ends Metric Rod Ends Spherical Bearings Inch Spherical Bearings Metric Spherical Bearings
Technical Resources
Terms and Definitions Articles Technical Data FAQs Key Term Translation Custom Engineered Products
Online Catalog
Engineers power search our entire catalog of bearing and bushings, with access to every attribute and technical specification possible. View our online catalog...
CAD (0) ▾
  • Cart is empty
  1. Request CAD files
Request Information Add to CAD Cart
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.
Unit of Measure

Specifications

Series

 N/A LL687900

Cone Part Number

 N/A LL687949

Cup Part Number

 N/A LL687910

Design Unit

 N/A Inch

Cage Material

 N/A Pin-Type

Related Assembly Number(s)

 N/A LL687949-90013 LL687949-90015

Dimensions

d - Bore

 N/A 38.5000 in977.900 mm

D - Cup Outer Diameter

 N/A 44.5000 in1130.300 mm

B - Cone Width

 N/A 2.5 in63.5 mm

C - Cup Width

 N/A 1.8750 in47.625 mm

T - Bearing Width

 N/A 2.6250 in66.675 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1 N/A 0.25 in6.4 mm
r - Cup Backface "To Clear" Radius2 N/A 0.250 in6.35 mm

da - Cone Frontface Backing Diameter

 N/A 39.57 in1005 mm

db - Cone Backface Backing Diameter

 N/A 39.76 in1010 mm

Da - Cup Frontface Backing Diameter

 N/A 43.51 in1105.15 mm

Db - Cup Backface Backing Diameter

 N/A 43.11 in1094.99 mm

Ab - Cage-Cone Frontface Clearance

 N/A 0.46 in11.68 mm

Aa - Cage-Cone Backface Clearance

 N/A 0.15 in3.81 mm
a - Effective Center Location3 N/A 4.52 in114.8 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)4 N/A 97300 lbf433000 N
C1 - Dynamic Radial Rating (1 million revolutions)5 N/A 375000 lbf1670000 N

C0 - Static Radial Rating

 N/A 1190000 lbf5290000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 N/A 72700 lbf323000 N

Factors

K - Factor7 N/A 1.34
e - ISO Factor8 N/A 0.44
Y - ISO Factor9 N/A 1.38

G1 - Heat Generation Factor (Roller-Raceway)

 N/A 18900

G2 - Heat Generation Factor (Rib-Roller End)

 N/A 3190.6
Cg - Geometry Factor10 N/A 0.363
  • 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 Ca90 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 Ca90 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.