Technical Guidelines

Tolerancing and other important design information can be found here.

Photo Etching Technical Guidelines

The photochemical etching technical information below highlights our photo etching capabilities and lowest tolerances achievable based on many variables such as metal thickness, metal type and special part features such as holes,  slots, and half-etched designs.

Our goal is to design a photo tool with as many parts per sheet of metal as possible.  As a general rule of thumb, thicker material and tighter tolerances will require a smaller sheet yielding fewer pieces.  On the contrary,  thinner metal with an extended range of tolerances will increase sheet size and part pieces.  Photochemical etching techniques are designed to achieve the lowest possible tolerance and the highest number of parts per sheet in order to save the customer time and money.

Table 1: Etched Dimension Tolerances
Thickness (T) in inches
Table 2: Holes or Slots
Metal Thickness (T)Diameter or Width
.001" -0.005"At least Metal Thickness, Minimum .003"
.005" or OverMinimum of 1.1 times
Metal Thickness
Table 3: Web or Finger
Metal Thickness (T)Space Between Holes (W)
Less than 0.005"At least Metal Thickness, Minimum .003"
Over .005"Minimum of 1.0 times
Metal Thickness
Table 4: Center to Center Tolerances
C/C Dimensions (inches)Tolerance Attainable
1.0" or Less±.0005"
1.0" - 3.0"±.0010"
3.0" - 6.0"±.0020"
6.0" - 10.0"±.0030"
Table 5: Half Etch Based on Material Thickness
25% - 75%100% +25%
Table 5: Allowable Materials
Material Name
Stainless Steel
Cold Rolled Steel
Alloy 42
Beryllium Copper
Beryllium Copper
Nickel Silver
Phosphorous Bronze
And more