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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.

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.

Metric Technical Data & Available Sizes
Thread
Diameter (d)
M1.4 M1.6 M2 M2.5 M3 M3.5 M4 M5 M6 M8 M10 M12
dk (mm) 2.6 3 3.8 4.5 5.5 6 7 8.5 10 13 16 18
d1 (mm) 0.95 1.12 1.4 1.8 2.2 2.6 3 3.8 4.5 6.2 8 9.5
d (mm) 1.4 1.6 2 2.5 3 3.5 4 5 6 8 10 12
S (mm) 1.3 1.5 1.5 2 2.5 2.5 3 4 5 6 8 10
L1 (mm) 2.8 3.2 4 5 4* 6 7 5* 8 6* 10 8* 12 10* 16 20 24
K (mm) 1.4 1.6 2 2.5 3 3.5 4 5 6 8 10 12
t (mm) 0.6 0.7 1.0 1.1 1.3 1.6 2 2.5 3 4 5 6
Available
Sizes (L)
M1.4 M1.6 M2 M2.5 M3 M3.5 M4 M5 M6 M8 M10 M12
6mm black icon image  
8mm black icon image black icon image black icon image black icon image*
10mm black icon image black icon image black icon image black icon image black icon image* black icon image*
12mm black icon image black icon image black icon image black icon image black icon image black icon image* black icon image* black icon image*
14mm black icon image black icon image black icon image black icon image black icon image
16mm black icon image black icon image black icon image black icon image black icon image black icon image black icon image black icon image* black icon image* black icon image*
18mm black icon image black icon image black icon image black icon image black icon image black icon image
20mm black icon image black icon image black icon image black icon image black icon image black icon image black icon image black icon image* black icon image*
22mm black icon image black icon image black icon image black icon image black icon image black icon image
25mm black icon image black icon image black icon image black icon image black icon image black icon image black icon image black icon image*
30mm black icon image black icon image black icon image black icon image black icon image black icon image black icon image black icon image*
35mm black icon image black icon image black icon image black icon image black icon image black icon image
40mm black icon image black icon image black icon image black icon image black icon image black icon image black icon image
45mm black icon image black icon image black icon image black icon image black icon image black icon image
50mm black icon image black icon image black icon image black icon image black icon image black icon image black icon image
55mm black icon image black icon image black icon image black icon image black icon image black icon image black icon image
60mm black icon image black icon image black icon image black icon image black icon image black icon image black icon image
65mm black icon image black icon image black icon image black icon image black icon image black icon image black icon image
70mm black icon image black icon image black icon image black icon image black icon image black icon image black icon image
75mm black icon image black icon image black icon image black icon image black icon image black icon image black icon image
80mm black icon image black icon image black icon image black icon image black icon image black icon image black icon image
90mm black icon image black icon image black icon image black icon image black icon image black icon image
100mm black icon image black icon image black icon image black icon image black icon image black icon image
110mm black icon image black icon image black icon image black icon image black icon image
120mm black icon image black icon image black icon image black icon image black icon image
130mm black icon image black icon image black icon image black icon image black icon image
140mm black icon image black icon image black icon image black icon image black icon image
150mm black icon image black icon image black icon image black icon image
160mm black icon image black icon image black icon image black icon image
170mm black icon image black icon image black icon image black icon image
180mm black icon image black icon image black icon image black icon image
190mm black icon image black icon image black icon image black icon image
200mm black icon image black icon image black icon image black icon image
210mm black icon image black icon image black icon image
220mm black icon image black icon image black icon image
230mm black icon image black icon image black icon image
240mm black icon image black icon image black icon image
250mm black icon image black icon image black icon image
260mm black icon image black icon image black icon image
270mm black icon image black icon image black icon image
280mm black icon image black icon image black icon image
290mm black icon image black icon image black icon image
300mm black icon image black icon image black icon image
black icon image = Available
Parts with * host different thread lengths.
Size not listed? Please contact us – we may be able to provide it.

Cap Head Reduced Shank Captive Screws Technical Drawing

d1 and L1 dimensions can be to customer specification.

 

Imperial Technical Data & Available Sizes
Thread
Diameter (d)
No.2 – 56 UNC No.4 – 40 UNC No.6 – 32 UNC No.8 – 32 UNC No.10 – 32 UNF 1/4″ – 20 UNC 1/4″ – 28 UNF 5/16” – 18 UNC 3/8” – 16 UNC
dk max. (in) 0.140 0.183 0.226 0.270 0.312 0.375 0.375 0.469 0.562
d1 (in) 0.061 0.078 0.095 0.120 0.130
0.156*
0.175  0.175 0.230 0.280
S (in) 5/64 3/32 7/64 9/64 5/32 3/16 3/16 1/4 5/16
L1 (in) 1/8 5/32 3/16 3/16
5/64*
1/4 1/4 1/4 3/8 3/8
K max. (in) 0.086 0.112 0.138 0.164 0.190 0.250 0.250 0.312 0.375
t min. (in) 0.038 0.051 0.064 0.077 0.090 0.120 0.120 0.151 0.182
Available
Sizes (L)
No.2 – 56 UNC No.4 – 40 UNC No.6 – 32 UNC No.8 – 32 UNC No.10 – 32 UNF 1/4″ – 20 UNC 1/4″ – 28 UNF 5/16” – 18 UNC 3/8” – 16 UNC
1/4″ black icon image black icon image
5/16″ black icon image black icon image
3/8″ black icon image black icon image black icon image black icon image* black icon image*
7/16″ black icon image black icon image black icon image* black icon image*
1/2″ black icon image black icon image black icon image black icon image black icon image
9/16″ black icon image black icon image black icon image
5/8″ black icon image black icon image black icon image black icon image black icon image black icon image black icon image
3/4″ black icon image black icon image black icon image black icon image black icon image black icon image black icon image black icon image
7/8″ black icon image black icon image black icon image black icon image black icon image black icon image black icon image
1″ black icon image black icon image black icon image black icon image black icon image black icon image black icon image black icon image
1. 1/8″ black icon image black icon image
1. 1/4″ black icon image black icon image black icon image black icon image black icon image black icon image black icon image
1. 3/8″ black icon image
1. 1/2″ black icon image black icon image black icon image black icon image black icon image
1. 3/4″ black icon image black icon image black icon image
2″ black icon image black icon image
black icon image = Available
Size not listed? Please contact us – we may be able to provide it.
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