We get a lot of questions about our sign blanks, but that's probably because we offer quite a few options to choose from. In the first post of our Sign Blanks 101 series, we're going to tackle the most basic options we offer: Aluminum Sign Blanks.

Our Aluminum Sign Blanks are just that - pieces of bare metal without any paint, vinyl, or reflective sheeting pre-applied to them. Since aluminum is typically used for traffic signs, all of our aluminum blanks are manufactured per U.S. Bureau of Public Roads standards. We also include holes for mounting and radius corner cuts in accordance with the Federal Standard Highway Signs Manual. Our aluminum blanks are alodized, or chemically treated, to prevent corrosion with a process that meets ASTM B449 specifications as a pre-treatment for paint or reflective sheeting applications.


Aluminum is available in various thicknesses and mixes. We refer to this as the gauge and the alloy. In our online store we've tried to make the buying process easier by listing our blanks in the most common gauge and alloy: .080" gauge, 3105 alloy. .080" is a standard gauge for traffic signs; 3105 is an industry-standard post-consumer and industrial recycled aluminum mix that uses material from a variety of sources. We also carry gauges from .025" to .125", and alloy 5052, which is a mix of "new" aluminum that is most commonly used at the state DOT level.

Here are some additional quick facts about our Aluminum Sign Blanks:
  • Production: all of our blanks are cut at our Bloomington, IN manufacturing facility, which means that we can cut just about any size and shape you need.
  • Sizing: we list our sizes with the horizontal dimension first, followed by the vertical dimension. This is important because for most blanks, the size specification will determine where the holes are punched for mounting. A 12" x 18", for example, will have holes punched in from the 12" side, top and bottom centered, so that the sign is in "portrait" orientation.
  • Phantom Points: signs with rounded corners are often sized using "phantom points". These points represent where the corner of the sign would be if the edge extended out from the side of the sign blank. On most shapes phantom points do not interfere with the sizing, but on triangle shapes it causes their actual measurements to be smaller than their "phantom measurements".
Have more questions? Contact us and we'll be happy to walk you through the purchasing process. And, stay tuned for the next installment, about our Reflective Aluminum Blanks!