Socket Cap Head Reduced Shank Captive Screws

Cap Head Reduced Shank Captive Screws are one of the most popular choices of Captive Screw, and are designed with an unthreaded portion below the head often referred to as the reduced shank.
The unthreaded portion is used to retain a Captive Washer. Captive Washers, when used alongside Captive Screws, compress during assembly to lock over the reduced shank and prevent it from coming loose.
This screw is an adaptation of DIN 912 with a plain portion leaving a reduced core diameter. Designed to self-retain post installation, which prevents the loss of screws.
They are used for safety equipment as well as within the manufacturing and military industries and are now required by EU law on equipment like safety guards.
Manufactured in A2 and A4 Stainless Steel as standard, with the latter specialised for prolonged exposure to aquatic environments. Other materials are available to order, including Titanium, Aluminium, Brass, and many more.
As standard, these Cap Head Reduced Shank Captive Screws are available in thread diameters from M1.4 to M12, with lengths ranging from 6mm to 300mm.
Non-standard sizes, materials and finishes are available to order as specials, including small volume manufacture, modifications and custom parts made to drawings.

d1 and L1 dimensions can be to customer specification.