How to measure a torx bit

Written by joshua benjamin
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Textron's line of Torx-head screwdrivers are designed to be used specifically with Torx-head screws. The bits on these screwdrivers are six-point splines, the individual sizes of which are measured in a standard known as "T-sizes." If you ever come across a Torx bit that's mislabelled or doesn't have a T-size on it, you can figure out the exact T-size with a ruler and a chart from Textron.

Skill level:

Things you need

  • Ruler

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  1. 1

    Place the ruler across the head of the Torx bit and line it up with the tip of one of the points.

  2. 2

    Line up the ruler so that you're measuring from the tip of the first point to the tip of the point directly opposite the first.

  3. 3

    Examine the markings on the ruler to determine how far apart the two points are.

  4. 4

    Compare the measurement with the "A" column of the first chart on the Wiha website in the Resource section to determine your Torx bit's exact T-size.

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