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Security Tri Head Bolt (Triangle Head Bolt)

The Tri (or Triangle) Head Bolt/Screw has a unique, deep, triangular head with a flange that requires a special key wrench for removal. This unique feature renders the bolts tamper proof, reducing the risk of vandals or intruders tampering with or undoing the screws.

This bolt is suitable for applications requiring higher torque, and is a 2-way reusable fixing, making it the ideal security fastener for when maintenance is required within the application.

The Tri Head drive is designed to use a key wrench, therefore reducing and resisting cam-out, which can occur more frequently in other drive types. The deep triangle style head makes this the perfect security screw in applications with a recess or channel such as a lamp post or telephone switching cabinet.

These security screws offer a medium security resistance against vandals and thieves at a relatively low cost, proving to be both economic and secure.

Tri Head Bolts are referred to by a number of names within the industry, such as Triangle Head Screw, DIN 22424 Security Screw, Security Lamp Post Screws and Security Recess Screws.

They can be used alongside the matching Tri Head Security Nut (Din 22425) or alternatively with security wave nuts, shear nuts, Kinmar reusable nuts, Kinmar permanent nuts, 4-Hole nuts or Pin Torx barrel nuts for added security.

Available as standard in A2 stainless steel, and off the shelf in M8 thread. Other diameters, lengths, thread sizes and materials are available to order.

Please contact us and send us your requirements to further your enquiry.

Security Tri Head Bolt

Thread / Length (mm) 20 30 40 50
M8
A B C D
M8 X (20, 30, 40mm) 13.7 8.5 6.5 1.5
M8 X 50mm 17.0 8.5 6.0 2.0

*For guidance purposes only

Ultra Drive Self Tapping Security Screw