# FRC Structure Standards

#### Hole Standards

* [**#10‑32 hardware**](https://andymark.com/collections/screws?page=1\&rb_filter_metafield_36db82c7f78d740b4ec25a08aae99765=10-32) 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**](https://andymark.com/products/1-x-1-peanut-extrusion-different-lengths) and [**Churro**](https://andymark.com/products/1-2-in-churro-different-lengths) extrusions use [**self-tapping 1/4-20 screws.**](https://andymark.com/products/1-4-20-x-1-in-thread-forming-screw-hex-washer-head)
* 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. 

<figure><img src="/files/fUR9e1ipVkRTiG6D0HFX" alt="" width="250"><figcaption></figcaption></figure>

{% hint style="info" %}
Use 3-4-5 gussets to put angled parts on pitch.
{% endhint %}

#### 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.&#x20;

#### Structural Profiles

* [Aluminum box tubing](https://andymark.com/products/box-tube-extrusion) (e.g., 2×1 ", 1×1 ") with wall thicknesses like 1⁄8″ or 1⁄16″ is commonly used for chassis and frame structures.&#x20;
* Many vendors offer [box tubing with pre-drilled .201" holes](https://andymark.com/products/pre-drilled-box-tube-extrusion) on a 1/2" pitch grid of various sizes.
* All [Robits tubes](https://andymark.com/products/robits-tubes) are compatible with the 1/2" pitch grid .201" hole sizes.&#x20;
* AndyMark also offers [Peanut extrusion](https://andymark.com/products/1-x-1-peanut-extrusion-different-lengths) 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.&#x20;


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