FRC Structure Standards

A list of common standards used in FRC and on AndyMark Products.

Hole Standards

• #10‑32 hardware is commonly used for most structural holes and fasteners; holes are typically sized for #10‑32 threads or 3⁄16″ rivets.

• Holes drilled or punched for #10 fasteners are commonly 0.196″ for a tight fit, and .201" for a clearance fit.

• Peanut and Churro extrusions use self-tapping 1/4-20 screws.

• Holes drilled or punched for 1/4-20 holes are commonly 0.256″ clearance before threading.

Hole & Grid Spacing

• A 1⁄2″ hole grid/pitch (center‑to‑center) is a widely adopted spacing on structural tubing and gussets, which lets teams line up holes easily for mounting brackets or attachments without custom patterns.

Use 3-4-5 gussets to put angled parts on pitch.

Bearings and Shaft Fit

• Hex shafting like 3⁄8″ or 1⁄2″ hex is typical for axles. These shafts usually use flanged 1/2" hex bearings with a 1.125" OD.

• Bearings are matched to the shaft diameter so the shaft can spin smoothly, teams often use standard bearings designed for these shaft sizes.

Structural Profiles

• Aluminum box tubing (e.g., 2×1 ", 1×1 ") with wall thicknesses like 1⁄8″ or 1⁄16″ is commonly used for chassis and frame structures.

• Many vendors offer box tubing with pre-drilled .201" holes on a 1/2" pitch grid of various sizes.

• All Robits tubes are compatible with the 1/2" pitch grid .201" hole sizes.

• AndyMark also offers Peanut extrusion for 1/4-20 self tapping screws.

These standards help teams mix and match box tube, gussets, and fasteners with minimal custom machining, which are especially useful in the time‑constrained FRC build season.