ADA Raster Beads Installation Guide for Signs
By Premium CNC & Router Bits for Precision Cutting | Published: 2026-10-18
Category: How-to Guides
Learn how to install stainless steel raster beads for ADA compliant tactile signs. Step-by-step guide with common mistakes to avoid.
Quick answer
Install ADA raster beads by drilling a .040 inch deep hole, pressing the bead flush, and verifying a secure fit. Use stainless steel beads for durability and ADA compliance.
Why stainless steel raster beads work best
Stainless steel raster beads resist corrosion and hold up to repeated touching, which is essential for tactile signage in public spaces. Their 1/16 inch diameter matches standard braille dot spacing, making them a reliable choice for ADA compliant signs.
Common installation mistakes
Drilling too deep causes beads to sit below the surface, making them hard to read. Drilling too shallow leaves beads protruding, which can snag or wear out. Using the wrong drill bit diameter also leads to loose beads that fall out over time.
Step-by-step installation process
- Mark the braille dot positions: Use a template or layout grid to mark exact dot positions on your sign material. Follow ADA spacing guidelines: dots 2.5 mm apart horizontally, 5 mm vertically. A misaligned dot pattern can make braille unreadable; double-check spacing before drilling.
- Drill a .040 inch deep hole: Use a dedicated ADA drill bit to create a hole exactly .040 inch deep. A depth stop on your drill press or router prevents over-drilling. Drilling deeper than .040 inch will cause beads to sit below the surface; test on scrap first.
- Insert the stainless steel raster bead: Press a bead into the hole using tweezers or a bead-setting tool. The bead should sit flush with the sign surface. Do not use adhesive; the friction fit holds it. If the bead is loose, the hole diameter is too large; switch to a smaller drill bit or a different bead size.
- Verify each bead is secure: Run a finger over the installed beads. They should feel smooth and not move. Any loose or protruding beads must be removed and reinstalled. A bead that spins or lifts indicates an improper fit; re-drill with the correct bit and replace.
Product used in this guide
- ADA Stainless Steel Raster Beads – 1000pcs: 1/16″ diameter (1.6mm) Stainless Steel 1000pcs, made in USA. Great for making ADA Braille signs. Drill a hole .040 deep using any of our ADA Drills and press beads in. The precise 1/16 inch diameter and .040 inch depth specification ensure beads sit flush and stay secure, meeting ADA tactile requirements without guesswork.
ADA Stainless Steel Raster Beads – 1000pcs
