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Security Clutch Head One Way Round Captive Screws

Security Clutch Head One Way Round Captive Screws have a unique shaped head that only requires a standard slotted screwdriver for insertion. This makes the security screw ideal for one-way permanent applications.

Captive screws are designed with an unthreaded portion below the head – often referred to as the reduced shank. Once installed, this screw is meant to self retain, which prevents any loss of fasteners.

The design of the vandal-resistant screw is suitable for medium torque applications and hosts a special chamfer at either side of the slotted drive. This enables the screws to be turned in only one direction. If it is turned the wrong way, the driver will slip out to avoid damage.

They are commonly found in public areas such as commercial toilet facilities where security is essential to prevent vandals or thieves tampering. It offers a medium and permanent security resistance, providing an economic and secure balance.

Clutch Head Security Captive screws can also be referred to as Clutch Drive, One Way Screws, One Way Round Screws and Perma Screws. They can be used with Security Wave Nuts, Shear Nuts, Kinmar Reusable Nuts, Kinmar Permanent Nuts and 4-Hole Nuts for improved security.

Available from Fastenright in thread diameters from M3 to M8, with lengths ranging from 12mm to 70mm.

Non-standard sizes, materials and finishes are available to order as specials, including small volume manufacture, modifications and custom parts made to drawings.

*Special removal tools are available but are only recommended for use with stainless steel clutch head screws. Fastenright Ltd only supplies removal tools to account customers that have purchased the corresponding screws from our company. We will refuse to sell removal tools to non-account customers. 

Security Clutch Head One Way Round Captive Screws Technical Drawing

d1 and L1 dimensions can be to customer specification.

 

Metric Technical Information & Available Sizes
Thread Diameter M3 M4 M5 M6 M8
dk (mm) 5.5 7.0 9.0 10.5
k (mm) 2.0 2.6 3.3 3.9
d1 (mm) 2.2 3.0 3.8 4.5 6.2
L1 (mm) 6.0 8.0 10.0 12.0 16.0
Available Sizes M3 M4 M5 M6 M8
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Size not listed? Please make an enquiry – we may be able to provide it.
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