Header fastener image

Security Fasteners and General Fixings from Stock and to order

Click To Make An Enquiry

Call +44(0) 1902 457734

Twitter Icon Facebook Icon LinkedIn Icon Skype Icon

Knurled Reduced Thread Captive Thumb Screws

SKU: CP18 Category:

These Knurled Captive Thumb Screws are a variant of the DIN 653 Knurled Captive Thumb Screws.

They feature a large cylindrical head which hosts a knurled edge and are designed to be adjusted easily by hand.

They feature an unthreaded shank, which is often referred to as a reduced thread, which allows for the use of a captive washer and stops the screw from being fully removed from its housing.

Available as standard in A1 Stainless Steel from Fastenright , with optional thread locking patches available.

Sizes available from M2 to M10, with lengths ranging from 8mm to 40mm.

Non-standard sizes and materials are available to order, including custom parts made to drawings.

knurled captive thumb screws din 633

d1 and L1 dimensions can be to customer specification.

Knurled Reduced Thread Captive Thumb Screws (DIN 653)
Thread Diameter M2 M2.5 M3 M3.5 M4 M5 M6 M8 M10
DK (mm) 9.29 – 8.71 11.35 – 10.65 12.35 – 11.65 14.35 – 13.65 16.35 – 15.65 20.42 – 19.58 24.42 – 23.58 30.42 – 29.58 36.5 – 35.6
d1 (mm) 1.4 1.8 2.2 2.6 3 3.8 4.5 6.2 8
L (mm) 8 10 12 14 16 20 25 32 40
L1 (mm) 4 5 6 7 8 10 12 16 20
K (mm) 2 – 1.75 2.5 – 2.25 2.5 – 2.25 3 – 2.75 3.5 – 3.2 4 – 3.7 5 – 4.7 6 – 5.7 8 – 7.64
Available Sizes M2 M2.5 M3 M3.5 M4 M5 M6 M8 M10
6mm  
8mm black icon image
10mm black icon image black icon image
12mm black icon image black icon image black icon image
14mm 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
18mm 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
22mm black icon image black icon image black icon image
25mm black icon image black icon image black icon image black icon image
28mm black icon image black icon image
30mm black icon image black icon image
32mm black icon image black icon image
35mm black icon image black icon image
40mm black icon image black icon image
black icon image = Available
Size not listed? Please call to discuss – we may be able to provide it.
Please make full use of our Fastener rotation by left-clicking and dragging to rotate, and using the mouse wheel to zoom in or out.
For display only, visuals may differ.

We use cookies on our website to ensure that we give you the best possible user experience.
If you continue without changing your settings, we'll assume that you are happy to receive all cookies on the Fastenright website. You can read more about removing Cookies here: Privacy Policy

Accept All