M8 x 40mm Butterfly Wing Bolt / Thumb Screw (DIN 316) – BZP Zinc Plated

Butterfly Wing Bolts / Thumb Screws (DIN 318) are designed for quick hand-tightening without tools. The wing head provides excellent grip, making these fasteners ideal for adjustments, clamps, jigs, fixtures and assemblies where parts are frequently removed or re-tightened. Finished in Bright Zinc Plated (BZP) for improved corrosion resistance.

Key features

• Standard: DIN 318 wing screw / thumb screw
• Head type: Butterfly wing head for easy hand tightening
• Thread: Metric
• Finish: Bright Zinc Plated (BZP)
• Sizes: M4 / M5 / M6 / M8 / M10 / M12 (choose from the dropdown)
• Pack options: multiple quantities available (choose from variants)

Common uses

• DIY & workshop: jigs, brackets, removable panels, light fixtures
• Industrial: machine guards, enclosures, maintenance access panels
• Projects & repairs: quick fastening where you need tool-free adjustment

How to choose the right size

• Thread size (M): e.g. M12 metric thread diameter.
• Length: select the length that matches your required engagement and material thickness.
• Pack quantity: choose the pack size you need from the dropdown.

Installation tips

• Start threading by hand to avoid cross-threading.
• Do not over-tighten; tighten until secure and stable for your application.
• For outdoor/harsh environments consider additional protection or alternative materials if required.

Note: Images are for illustration. You will receive the selected size and pack quantity as chosen in the variants.