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Types of Security Screws
Security Screws come in two basic types:
- The Perma fix range and
- Releasable screws which require a special matching screwdriver to do them up or undo them.
The Perma fix range of security screws are one way screws which, once tightened, cannot be undone. Whereas releasable security screws can be done up and undone, but only with a special matching security screwdriver or driver bit.
Two types of Perma-fix Security Screws
Clutch Head security screws are a slot headed type of screw which can be done up with a standard flat bladed screwdiver, but once installed, cannot be undone as the reverse drive face of the screw head is milled away so the screwdriver simply slips off the screw.
Posidrive type Sentinel security screws can be installed with a standard philips type screwdriver.
Releasable Security Screws
Releasable security screws can be done up and undone again if required, but only by using a special matching security screwdriver or driver bit.
They are available with a variety of drive head types including:
- Pin Torx (also known as pin star drive screws)
- Pin Hex screws
- 2 hole security screws (also known as pig nose screws or snake eye screws) and
- Kinmar screws
Other forms of releasable security screws are available and new designs are continuously being developed.
More Information
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