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Stud Hole Types
There are 4 main stud hole types which are identified as follows:
  • American / Japanese R22 Ball Taper for Double Cap Nut
  • English 80 degree Countersink
  • ISO No Countersink for Two-Piece Flange Nut
  • DIN R18 Ball Taper for Nut & Washer
Note: When retro-fitting forged alloy wheels in place of steel wheels on some truck models (e.g. Hino & Isuzu trucks), a special retro fit forged alloy truck wheel, with a 10/335 bolt pattern and a 32mm Retro stud hole size is required. Matching retro wheel nuts are required for this application.
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