Torx Plus
Direct Answer
Torx Plus is an advanced evolution of the hexalobular star drive introduced by Textron Fastening Systems in the 1990s. Featuring squarer, elliptical lobes and a true 0-degree drive angle, it increases torque transmission capacity by up to 35% and extends assembly tool bit life by up to 100% in industrial manufacturing.
Source: Acument Global Technologies / ISO 10664 Evolution
Specs
| Proprietary Standard | Acument Global Technologies (formerly Camcar Textron) |
| Drive Geometry | 6 elliptical lobes with flattened lobe tips |
| Drive Angle | 0 degrees (true perpendicular tangential drive vector) |
| Torque Transmission Gain | Up to 35% higher torque than standard Torx |
| Tool Bit Lifespan Gain | 100% to 200% longer drive bit life |
| Sizing Notation | IP (Internal Torx Plus: 1IP to 100IP) and EP (External Torx Plus) |
| 5-Lobe Security Variant | Torx Plus Security (5-lobe star with central tamper pin, 8IPR to 50IPR) |
0-Degree Drive Vector Physics
While standard Torx operates with a 15-degree drive angle, Torx Plus squares off the lobe flanks to achieve a true 0-degree drive angle. This completely eliminates any radial outward expansion forces, preventing the thin sidewalls of miniature fasteners from expanding or deforming under extreme power-tool impact loads.
Backward and Forward Compatibility Rules
- Standard Torx Bit in Torx Plus Screw: A standard Torx bit (e.g. T25) will fit inside a Torx Plus (25IP) screw and can turn it, but with loose clearance and reduced torque capacity.
- Torx Plus Bit in Standard Torx Screw: A Torx Plus bit will not fit into a standard Torx screw because the elliptical lobes are too wide to enter the narrower standard Torx recess.