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5
BRAKE DRUM DATA SHEET
When selecting a Webb replacement drum, the manufacturer’s name and part number is helpful. If this
information is not available, a replacement drum can be selected by comparing dimensions. A drawing is
shown below, and at the beginning of the Progressive Section, which indicates the dimensions required to
determine the existence of a replacement drum. If all of the dimensions shown are not available, we must
have at least dimensions C, D, E, J, K and O to make a selection.
Information required for drums not listed in this catalog:
1. Wheel or Hub Number
2. Make and Number of Axle
3. Manufacturer’s Brake Drum Number
4. Drum Type (See Page 3)
5. Actual Brake Drum Dimensions (See Figure Below)
A. Overall Diameter of Drum
I. Inside Finished Diameter
B. Dust Shield Recess Diameter, If Applicable
J. Bolt Circle Diameter
C. Brake Surface Diameter
K. Pilot Diameter
D. Overall Depth
L. Outside Finished Diameter
E. Brake Surface Flat
M. Diameter at Taper
F. Depth of Dust Shield Recess
N. Backplate Thickness
G. Squeeler Band Thickness
O. Bolt Holes: Number and Size
H. Distance from Outside of Backface
to Start of Taper