Product Overview

Application Scenarios

Wing screws (DIN 316), also called butterfly or thumb-wing screws, are the male counterpart to the wing nut — two upright wings on a threaded shank that let them be driven in and out by hand with no tool. They are used wherever a screw must be set or removed often and quickly: machine guards and covers, adjustable stops and clamps, electrical and electronic enclosures, jigs and fixtures, furniture and display fittings, and sports and camping gear. The American-form wings give a firm finger grip; stainless A2 / A4 versions suit damp, outdoor and food-contact use, and their light clamp force suits frequently-serviced rather than structural joints.

Installation Notes

Start the thread square by hand and run the screw down by turning the wings, then nip it up with firm finger-and-thumb pressure — no driver is needed, and heavy tooling can bend the wings. Use a flat washer under the wings to spread the load and protect the surface, and a spring washer where mild vibration is present. Wing screws give a modest clamp force by design, so use them for covers, guards and adjustable joints rather than high-load connections, and choose stainless or plated finishes for wet or outdoor service.

Material & Certification

Cold-forged from austenitic stainless steel — A2 (AISI 304) or A4 (AISI 316) — to DIN 316, with wing span and thread gauge-checked and every batch traceable to raw material certificates. Each lot passes dimensional inspection before packaging; EN 10204 3.1 material certificates are available on request.