# Fasteners

Screws are one of the most commonly used fasteners in FTC and are essential to structural integrity and modularity. Choosing the right screw type can affect weight, strength, ease of maintenance, and durability under vibration.

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<summary>Screw Material Guide</summary>

* **Steel (Black Oxide or Zinc-Plated)**\
  Strong and affordable. Black oxide provides mild corrosion resistance. Commonly used in frame and drivetrain construction.
* **Stainless Steel**\
  Corrosion-resistant and durable but heavier. Good for exposed or long-lasting assemblies.
* **Aluminum Screws**\
  Extremely lightweight but weaker. Rarely used outside of aerospace-style applications or weight-optimized robots.
* **Nylon Screws**\
  Lightweight and non-conductive. Useful for electronics mounting, but unsuitable for load-bearing use.

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### Threadlocker

**Threadlocker** is a type of adhesive that’s applied to screw threads to prevent loosening due to vibration or shock. FTC robots undergo constant motion—especially in drivetrains and arms—so threadlocker is essential for keeping screws from backing out during matches.

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* **Blue Threadlocker (Removable)**\
  This is the most commonly used threadlocker in FTC. It prevents loosening but still allows you to remove the screw later with hand tools. Ideal for drivetrain components, mounting plates, motor screws, and anywhere vibrations are common.
* **Red Threadlocker (Permanent)**\
  This is much stronger and usually requires heat to remove. It’s *not recommended* for FTC unless you're securing something you **never** plan to take apart (like press-fit bearings or permanent inserts).
* **Purple Threadlocker (Low Strength)**\
  Good for small screws (like M2 or M3) or delicate parts. Easier to remove than blue but still provides some vibration resistance.

### Washers

{% tabs %}
{% tab title="Flat Washers" %}
The most common washer type. They distribute the screw’s force over a larger area, which protects softer materials like plastic or aluminum from being crushed or deformed. Also useful in slotted holes to prevent slipping.
{% endtab %}

{% tab title="Lock Washers" %}
Designed to resist loosening. They come in split-ring or star (internal/external tooth) varieties. These are **less common in FTC**, where blue threadlocker or nylon-insert nuts are typically preferred.
{% endtab %}

{% tab title="Fender Washers" %}
Extra-large washers that spread force across a wide surface. Useful for mounting electronics, covering oversized holes, or protecting soft materials like polycarbonate.

{% endtab %}

{% tab title="Nylon Washers" %}
Non-conductive and slightly compressible. Used for isolating electronics or protecting fragile surfaces. Common in mounting sensors, batteries, or REV hubs.
{% endtab %}
{% endtabs %}

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