Quarter-Turn Enclosure Screws & Key | Quick-Release Captive Latch (FIBOX / Rose style)

If you've ever lost or broken the plastic retaining screws on an industrial electrical box, control panel, or outdoor junction enclosure (such as Rose Mini Polyglas, FIBOX, or Hensel boxes), you know how hard they are to source individually.

These are not standard metric screws. They use a steep, interrupted bayonet-style quick-lock thread that secures the box lid with just a 90-degree turn.

I designed this parametric replacement set so you can easily print functional spares on demand. In addition to the original cross-slot screw, I created a Tool-less Butterfly (Wingnut) version for quick hand access without needing tools, and a dedicated Key Tool that fits right on your keychain!

Key Advantages

• 100% Support-Free: All three models (Standard Screw, Butterfly Screw, and Key) print completely without support structures.

• Tool-Free Convenience: The butterfly version lets you open enclosures quickly by hand.

• Optimized Strengths: Designed to print in an orientation that ensures clean thread geometry and high strength.

• Parametric Source: Fully customizable via OpenSCAD if your enclosure uses slightly different dimensions.

Dimensions (Standard Fit)

• Total Length: 37 mm

• Head Height: 10 mm

• Stem Length: 15 mm (7 mm diameter)

• Thread Length: 12 mm (10 mm outer diameter)

Recommended Print Settings

• Material: PETG, ASA, or ABS recommended for outdoor durability, layer strength, and chemical resistance. (PLA works fine for indoor use).

• Supports: NO SUPPORTS NEEDED for any of the parts!

• Perimeters / Wall Loops: Set to 5–6 perimeters (or 100% infill on the stem) to prevent twisting or shearing under high torque.

• Layer Height: 0.16 mm – 0.20 mm for smooth thread operation.

• Orientation:

  • Screws: Print upside down (head/butterfly flat on the build plate).

  • Key: Print upright standing on its wide base, use brim