WCI-244 Hole Angularity Gauge

At Last, Hole Angularity Measurement That Works In The Real World of Aircraft/Aerospace Manufacturing

Are Your Fasteners Tipped?


    Gives repeatable measurements to 1/17 of a degree, even if holes are countersunk, coldworked, slightly tapered, or layers have shifted — try that with pins!


    The entire kit is in an 8 x 8 x 3 box, weighing about 2 pounds. No wires, no batteries - takes up little space in a toolroom.


    Check 1/4, 5/16, 3/8, 7/16 and 1/2" nominal holes - from .010 below nominal to .020 above nominal with only 5 probes. No need for a large collection of pins, where the pin you need most turns up missing.

About WCI-244 Hole Angularity Gauge


Finally, a very accurate, compact, and simple hole angularity gauge is available.

This gauge is ideal for holemaking process development and troubleshooting drilling problems on the production line.

The gauge has no electronic parts, thus no problem having the unit die at an inopportune time.

This gauge works better than existing gauges because the probe that fits into the hole to be checked is the first to sucessfully adapt to common hole issues such as integral countersinks, coldworking, forward or reverse tapers, or even slight post-drilling shifting of different layers of material.

It does this by contacting the top edge of the hole with a taper, and a lower section of the hole with an expanding probe. The measurement is from the true geometric center of the hole, and the expanded probe cannot rock or wiggle, so measurements are very repeatable and accurate to 1/17 of a degree.

How To Use:


  1. Select correct probe for hole size
  2. Remove probe knob and probe lock knob (Fig. 1)
  3. Slide probe into gauge body as shown.
  4. Tighten probe lock knob.
  5. Set indicator point to correct position using setting block (Fig. 2)
  6. Put the probe into hole as far as it will go.
  7. Tighten probe knob so probe is snug in hole: tight enough that it will not rock, but not so tight it cannot be rotated.
  8. Using indicator height adjust knob, and rotating angularity gauge in hole, adjust indicator height so that the indicator gives a reading for a full 360 degree rotation of the angularity gauge.
  9. Rotate the tool so that the indicator needle is at it’s smallest deflection. Rotate the indicator bezel so that zero lines up with the indicator needle.
  10. Rotate the angularity gauge in the hole. Note the maximum deflection of the needle. Refer to chart to find hole angularity.
  11. Maximum needle deflection indicates tilt direction of hole.

step 1 hole-angularity-gaugestep 2 hole-angularity-gaugestep 3 hole-angularity-gaugestep 4 hole-angularity-gaugestep 5 hole-angularity-gage