Wing Screws Zinc-plated DIN 316 M4×25 mm, Koelner, pack of 2

Koelner wing screws zinc-plated to DIN 316, size M4×25 mm, supplied in a pack of two. These fasteners feature a wing-shaped head designed for manual tightening and loosening without tools. The zinc-plated surface provides corrosion resistance suitable for indoor environments and general-purpose applications. The screws conform to DIN 316 dimensional standards and are intended for assemblies that require frequent adjustment or tool-free access.

Advantages

The wing head enables quick hand operation, reducing the need for screwdrivers or wrenches during installation and maintenance. Zinc plating offers basic protection against rust and extends service life in non-aggressive environments. Conformance to DIN 316 guarantees uniform thread and head dimensions for compatibility with standard M4 threaded holes and nuts. The compact M4×25 size is convenient for light-duty fastening where space is limited.

Suitable for

• Small fixtures and brackets that require occasional removal or adjustment
• Equipment panels and access covers for tool-free entry
• Light DIY projects and hobby assemblies
• Enclosures, casing and mounting of electronics with M4 threads

Key specifications

• Thread size: M4
• Length: 25 mm (threaded shank length)
• Head type: wing (manual tightening)
• Material and finish: steel with zinc plating
• Standard: manufactured to DIN 316 dimensional requirements
• Pack quantity: 2 pieces

How to use

Insert the screw into the corresponding M4 threaded hole or through a clearance hole into an M4 nut and turn the wing head by hand until the required clamping force is achieved. For initial alignment, finger-tighten and then adjust by hand to ensure even seating. Avoid overtightening by hand; if higher torque is necessary, use a suitable tool only if the wing head design permits and does not deform. For repeated access, maintain threads by ensuring they are clean and lightly lubricated if appropriate for the application.

Usage recommendations

Use these zinc-plated wing screws in dry or mildly corrosive indoor environments. For outdoor or highly corrosive conditions, consider stainless steel or specially coated alternatives. Check thread engagement length to ensure secure fastening—at least the full thread length should engage with the mating part or nut.