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Button Head Captive Screws are useful in a number of safety-oriented applications and are required by European Union law on some equipment such as safety guards.
They are high precision safety fasteners that host an unthreaded section below their head, which is often referred to as a reduced shank.
Once installed with a captive / lock washer (available on request), they are unable to be fully removed from their installation hole.
Found across a number of types of industrial machinery, where a lost or loose screw could cause catastrophic damage to a production line. They can also be found in certain military applications where the speedy removal and reinstallation of panels is required.
Available from Fastenright as standard in A2 and A4 Stainless, with specialist materials also available including Brass and Aluminium.
Sizes from M2 to M16 and lengths ranging from 8mm to 150mm.
Non-standard sizes and materials are available to order, including custom parts made to drawings.
d1 and L1 dimensions can be to customer specification.
| Button Head Reduced Shank Captive Screws | ||||||||||||
| Thread Diameter | M2 | M2.5 | M3 | M3.5 | M4 | M5 | M6 | M8 | M10 | M12 | M16 | |
| dk (mm) | 3.5 | 4.5 | 5.7 | 6.6 | 7.6 | 9.5 | 10.5 | 14 | 17.5 | 21 | 28 | |
| d1 (mm) | 1.4 | 1.8 | 2.2 | 2.6 | 3 | 3.8 | 4.5 | 6.2 | 8 | 9.5 | 12.5 | |
| S(mm) | 1.27 | 1.5 | 2 | 2 | 2.5 | 3 | 4 | 5 | 6 | 8 | 10 | |
| L1 (mm) | 4 | 5 | 6 | 7 | 8 | 10 | 12 | 16 | 20 | 24 | 28 | |
| K (mm) | 1.3 | 1.5 | 1.65 | 1.9 | 2.2 | 2.75 | 3.3 | 4.4 | 5.5 | 6.6 | 8.8 | |
| t (mm) | 0.8 | 1 | 1.04 | 1.2 | 1.3 | 1.56 | 2.08 | 2.6 | 3.12 | 4.16 | 5.2 | |
| Available Sizes | M2 | M2.5 | M3 | M3.5 | M4 | M5 | M6 | M8 | M10 | M12 | M16 | |
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| 130mm | |
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| 140mm | |
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| 150mm | |
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| = Available Size not listed? Please call to discuss – we may be able to provide it. |
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