Recess Penetration Gages


Penetration Depth

This is the distance a precisely made gaging element enters a fastener’s recess. This is usually less than the “recess depth”. This measurement is an indication of how deeply a driving bit will engage in the recess.

Recess Depth

The deepest point in a fastener’s recess. This is usually a sharp point in the center of the recess.

Recess Torsional Strength

This is the ability of a recess to resist damage from driver bit camout or reaming when a rotational force (torque) is applied to the bit engaged in the recess with a specific amount of end load pressure applied to keep the driver engaged in the recess. This requirement is defined in MIL-S-87114A.

Individual Recess Gages:

These are gages designed to measure only one type and size of recess, rivet hole or slot. The standard gages are equipped with electronic, digital indicators that will read out in either inches or millimeters. Gages are available with dial indicators upon special request.
  • ANSI/ASME Type 1: Phillips #0, #1, #2, #3, #4
  • ANSI/ASME Type IA: POZI-DRIVE #0, #1, #2, #3, #4
  • ANSI/ASME Type III: Square socket #1, #2, #3, #4
  • Hex Socket (GO element) .050″ through 9/16″; 1.5mm through 14mm
  • ANSI/ASME Type VI: 6-Lobe Recess T-3 through T-100
  • Others available upon request.