The Security Tri Head Bolt, or Triangular Head Bolt has a unique, deep, triangular head with a flange that requires a special triangular 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 Triangular Head 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.
Security 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.
Manufactured in Steel Grade 5.8 and Steel Grade 8.8 as standard, with some sizes available in A2 Stainless Steel.
Available from Fastenright in thread diameters M4 to M16. A reduced shank version is also available.
Non-standard sizes, materials and finishes are available to order as specials, including small volume manufacture, modifications and custom parts made to drawings.
|Metric Technical Data|
|Diameter / Length||A (mm)||B (mm)||C (mm)||D (mm)|
|M8 x (20mm, 30mm, 40mm)||13.7||8.5||6.5||1.5|
|M8 x 50mm||17.0||8.5||6.0||2.0|
|Metric Available Sizes|
| = Grade 5.8 and Grade 8.8 Steel // = A2 Stainless Steel
Size not listed? Please contact us – we may be able to provide it.