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Clutch Head Raised Countersunk Security Screws

Tamper proof clutch head raised countersunk security screws for the electrical trade.

One way screws, typically used in access control panels, prisons, hospitals, mental health facilities, schools and public areas.

Tamper Resistant Clutch Drive One Way Permanent Security Screw – Raised Countersunk Head, Stainless Steel

Thread / Length (mm) 12 20 25 30 40 50 60 70


Vandal Resistant 1 Way Security Screw With Slotted Drive
Tamper proof – Permanent Security Fixing
Requires Standard Slotted Screwdriver

Clutch Head Security Screws

Tamper resistant Clutch Head security machine screws are available off the shelf in stainless steel with other materials and sizes available to order.

The Clutch Head Security Screw has a unique head that requires only a standard slotted screwdriver for insertion, making this the ideal security screw for one way permanent applications such as prisons.

Due to the design of the vandal resistant Clutch Head Security Screw it is suitable for medium torque applications and is a one-way screw, i.e. a permanent fixing.  The unique drive system has a special chamfer at either side of the slotted drive enabling the screws to be turned in only one direction, so when turned anticlockwise the tool simply slips out.
The clutch head security screw is most commonly seen in public areas such as commercial toilet facilities, where maintenance is not required but security is essential to prevent vandals tampering.

Tamper resistant Clutch Drive security screws offer a medium and one way permanent security resistance against vandals and thieves at a relatively low cost , proving an economic and secure equilibrium. Within the industry Clutch Head security screws are also referred to by other names including Clutch Drive, One Way Screws, One Way Round Screws, Perma Screws.

For more information and technical data regarding tamper resistant Clutch Head security products please call our sales team.

Note: Special Clutch Head Security Screws can be made to order including small volume manufacture, modifications and custom parts to drawings.

Tamper Resistant Clutch Head machine screws can be used with security Wave Nuts, Shear Nuts, Kinmar Reusable Nuts, Kinmar Permanent Nuts, 4-Hole Nuts or Pin Torx Barrel Nuts for added security.

*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 bought the corresponding screws from our company.  We will refuse to sell removal tools to non-account customers.

Clutch Head raised countersunk technical drawing

DK (mm) K (mm)
M3.5 6.7 2.1

*For guidance purposes only

Clutch One Way Permanent Raised Countersunk Security Screw for the Electrical Trade