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Clutch Head Countersunk Security Wood Screws

Tamper proof clutch head security wood screws protect against vandals & thieves offering:

  • One way permanent fixing
  • An economic secure solution
  • Medium security resistance
  • Permanent 1-way drive
  • Usable for medium torque applications

Tamper Resistant Clutch Drive One Way Permanent Security Wood Screw – Countersunk Head Zinc Plated Steel

Gauge / Length (mm) 3/4″ (19) 1″ (25) 1 1/4″ (32) 1 1/2″ (38) 2″ (50) 2 1/2″ (63) 3″ (75)
No.6 (3.5mm)
No.8 (4.2mm)
No.10 (4.8mm)
No.12 (5.5mm)


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

Tamper Resistant Countersunk Clutch Head Security Wood Screws

Tamper resistant Clutch Head security wood screws are available off the shelf in zinc plated 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.  Although the clutch head security screws provide an excellent permanent security solution for mass usage they can be time consuming to install, therefore when installation time is essential we can offer another one way permanent option, the ‘Sentinel Security Screw’, which utilises a modified Pozi drive allowing standard pozi drill bits to be used for fast and high volume installation.

Due to the design of the vandal resistant Clutch Head Security Screw it is suitable for medium torque applications and is 1 way – 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.

*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 countersunk self tapping screw technical drawing

No.6 No.8 No.10 No.12
DK (mm) 7.0 8.3 9.3 11.0
K (mm) 3.5 4.6 5.0 5.4

*For guidance purposes only

Clutch One Way Permanent Security Wood Screws