Harden low flange track, double sided
Main Photo
Category:  Hubs
Name:  Harden low flange track, double sided
Brand:  Harden
Years:  Mid 1940's - Mid 1950's
Country:  England
Added By: be.audiophil on 06/24/11
Updated By: peterbman on 10/31/16
Additional Photos - click for full size
Harden low flange track, double sidedHarden low flange track, double sidedHarden low flange track, double sided
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Gear Compatibility double fixedFront Bearing Size/CountCartridge bearing
Rear Bearing Size/CountCartridge bearingRear Spacing110mm
Spoke Drilling32; 36; 40Flange SizeLow Flange
Gear Threading/Pattern English/ISO: 1.375 x 24 TPIBody Markings
Axle MaterialSteelShell MaterialAluminum
General Information
The low flange version of "Bacon Slicer". They have rather thin solid flanges with spoke holes quite close to the edge.

The design has important features decades ahead of its time such as the use of annular race cartridge bearings. 

The cartridge bearings were a standard industrial size, replaceable by heating the hub to expand it.  The rear bearing should have been regarded as too small for the job.

A detailed history of Harden and their various innovations and quirks is at

More information about Harden can be found at

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Additional Resources
Resources:Reference & Charts
Brand Information(click to expand)
 Unlike most makers of the time period, Harden produced their hubs by machining aluminum alloy from a casting and were one of the first hub manufatures to extensively use sealed catridge bearings in their hubs.
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