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Sentinel Button Security Machine Screw

Sentinel security screws – button head

Button head sentinel screws have a unique head which can only be turned clockwise, so once securely tightened, they cannot be removed without drilling out.

Installed using only a standard cross head or pozi driver, sentinel security screws are quick to install with power drivers or standard screw drivers, so are a popular choice for installers and for large volume applications.

  • 1-way permanent security fixing
  • Tamper-proof for use where maintenance is not required
  • Button head security screw
  • Suitable for high torque applications
  • Good for use with power drivers
  • Typically used in prisons, public facilities and toilets and for industrial roofing

Button head security machine screws

The drive of the Sentinel security screws offers medium security resistance against vandals and thieves at a relatively low cost.
The Sentinel drive is an adaptation of the original Nettlefolds ‘Pozi’ drive, designed to provide a secure and permanent fixing.   With high resistance to cam-out, Sentinel screws are a preferred choice for applications requiring high volume, labour intensive work.

Sentinel button 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.

Available from stock in zinc plate, with other sizes and materials available to order.
Specials made to order, including medium / high volume manufacture, modifications and custom parts to drawings – please enquire.

Thread / Length (mm) 12 16 20 25 30 40 50
M4
M5
M6
M8

Sentinel button machine screw technical drawing

M4 M5 M6 M8
DK (mm) 7.7 9.8 11.6 15.8
K (mm) 2.8 3.5 4.2 5.5

*For guidance purposes only

Sentinel Button Head Security Screws