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Socket Countersunk Reduced Thread Captive Screws are designed to lock into place after they have been installed. They feature a countersunk head, allowing them to sit flush in the housing that they are placed into.
These screws are intended for use alongside pre-drilled and countersink holes and can be manufactured in a wide range of materials. See our full range of Captive Screws here.
Countersunk Captive Screws are required by law on some pieces of machinery and equipment, and this type of fastener sees large usage within industrial machinery and military applications.
Socket Countersunk Reduced Thread Captive Screws are supplied in A2 Stainless Steel and A4 Stainless Steel as standard, with other specialist materials available to order – including Titanium, Brass and Phosphor Bronze. Thread locking patches are available if required.
Available from Fastenright in thread diameters from M2 to M12 and in lengths up to 200mm as standard.
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.
| Technical Data & Available Sizes | ||||||||||||
| Thread Diameter | M2 | M2.5 | M3 | M3.5 | M4 | M5 | M6 | M8 | M10 | M12 | ||
| dk (mm) | 4 | 5 | 6 | 6.5 | 8 | 10 | 12 | 16 | 20 | 24 | ||
| d1 (mm) | 1.4 | 1.8 | 2.2 | 2.6 | 3 | 3.8 | 4.5 | 6.2 | 8 | 9.5 | ||
| S(mm) | 1.27 | 1.5 | 2 | 2 | 2.5 | 3 | 4 | 5 | 6 | 8 | ||
| L1 (mm) | 4 | 5 | 6 | 7 | 8 | 10 | 12 | 16 | 20 | 24 | ||
| K (mm) | 1.24 | 1.55 | 1.7 | 2.1 | 2.3 | 2.8 | 3.3 | 4.4 | 5.5 | 6.5 | ||
| Available Sizes | M2 | M2.5 | M3 | M3.5 | M4 | M5 | M6 | M8 | M10 | M12 | ||
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| 55mm | |
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| 65mm | |
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| 140mm | |
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| 180mm | |
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| 190mm | |
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| 200mm | |
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| = Available Size not listed? Please contact us – we may be able to provide it. |
