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Socket Cap Head Reduced Shank Captive Screws

SKU: CP01 Categories: ,

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.

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.

This screw is an adaptation of DIN 912 with a plain portion leaving a reduced core diameter.

As standard these screws are available in A2 and A4 Stainless steel, with the latter specialised for prolonged exposure to aquatic environments. Other materials can include Aluminium and Brass, as well as much more.

Available in a wide range of sizes and lengths, with specials available to order and customer specification focused changes also available.

Cap Head Reduced Shank Captive Screws Technical Drawing

d1 and L1 dimensions can be to customer specification.

Cap Head Reduced Shank Captive Screws
THREAD M1.4 M1.6 M2 M2.5 M3 M3.5 M4 M5 M6 M8 M10 M12
dk (mm) 0 3 3.8
4.5
5.5
6
7
8.5 10 13 16 18
d1 (mm) 0 1.12 1.4 1.8
2.2 2.6 3 3.8
4.5 6.2 8 9.5
d (mm) 0 1.6 2 2.5
3 3.5 4
5 6 8 10 12
S(mm) 0 1.5 1.5
2
2.5 2.5 3 4 5 6 8 10
L (mm) 0 8 8 10 12 16 16 20 25 35 40 50
L1 (mm) 0 3.2 2.8 5 6 7 8 10 12 16 20 24
K (mm) 0 1.6 2 2.5 3 3.5 4 5 6 8 10 12
t (mm) 0 0.7 1 1.1 1.3 1.6 2 2.5 3 4 5 6
AVAILABLE SIZES 0 M2 M2 M2.5 M3 M3.5 M4 M5 M6 M8 M10 M12
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