Security Screws and Tamper Resistant Fasteners
Tamper Proof Screws, Nuts and Matching Security Bits
Tamper Proof Security Screws, or Tamper Resistant Screws, are distinguished by having an unconventional drive, making tampering with the screw more difficult, if not impossible without the matching driver or bit. Security Screws are used for securing materials from being tampered with in public areas, such as gutters, license plates, grills, and hardware in jails, schools, boats and cars. Tamper proof fasteners are also commonly used in food prep and processing areas, particularly in stainless steel. You will often see security screws used in bathroom stalls, toilet partitions and other public locations. Security screws in this selection are grade 18-8 or higher stainless steel, which prevents rusting and is corrosion resistant. Security fasteners are engineered in different styles, however they all share the same principle that removal of the fastener is impossible (or at least very hard!) without the corresponding bit.
Spanner (Snake Eye) Screws
Tamper Proof Spanner or "Snake Eye" screws are installed using a spanner bit. Spanner Screws are commonly referred to as "Snake Eye" because of the two dot drive system. Spanner screws can only be installed or removed with a spanner bit, which fits a pin into each of the security fastener's two drive holes. Since Spanner screws can only be installed or removed through spanner bits, they are very resistant to tampering.
Torx (6 Lobe with Pin) Screws
Torx® with pin security fasteners can only be driven with Torx Tamper Proof (TT) security bits and are used to prevent tampering and theft. Security Screws in this variety are characterized by the 6 lobe, or star drive with a central pin. The pin grants additional resistance as it prevents conventional screwdrivers and grabbing devices from tampering with the original installation.
One Way Screws
One Way Screws are also known as One Way Slotted, Irreversible, and One Direction Screws. The head of the screw features a slotted drive that is designed to instantly cause cam out if the driver is turned left, or loosening the installation. This is achieved by manufacturing the drive in quadrants that are gradually raised to accept the driver bit when turning the screw right, and reject it when turning the screw left. The One Way drive makes installation of the screws easy, requiring only a standard slotted bit, but removal of the screw difficult (if not impossible) without drilling or a specifically designed removal tool.
Tri-Groove Security Nuts
Tri Groove Nuts feature a tapered diameter, making the nuts resistant to gripping devices. Tamper Proof Nuts are installed using a special Tri Groove socket, which grips the indentations along the outside of the security fastener to turn the nut along a thread. Tri Groove nuts are also referred to as T Groove, Trident Drive and Coned Trident Drive Nuts are tamper resistant. Security Nuts are commonly used with driverless fasteners such as carriage bolts to add security to an assembly; it can only be installed or removed from one side.
FREE BIT INCLUDED WITH PURCHASE OF 25, 100, 250 or 1,000 PACKS OF SECURITY SCREWS.
For more information on fastener types, grades, and materials, please visit our Fasteners 101 page here