The Torx screwdriver head shape is one of the most popular and highly used shapes. This six-pointed star design was developed by Camcar Textron in 1967 for use on automotive components. It has provided better torque transmission and reduced camming compared to Phillips and slotted screwdriver heads. This has made Torx screwdrivers crucial for precision applications across various industries. These include electronics, medical devices, small appliances, and more. Their bite-resistant design prevents damage to fasteners during assembly and maintenance work.
Torx Screwdrivers: Shape/Design Overview
The Torx screwdriver head features a six-pointed star shape. These points can mate perfectly with the internal recesses in a Torx fastener. When fitted properly, all pressure is directed between these points. This means rotational force is easily transferred from the screwdriver to the fastener. It reduces the risks of slipping or rounding out.
By directing all torque transfer along the sharp points, the Torx screwdriver head helps maximize control and accuracy during assembly and disassembly tasks. The self-centering qualities of the Torx also ensure consistent bites each time. This protects both the fastener and assembled components from potential damage. Accidental gouging or over-tightening aren’t a concern with the Torx screwdriver.
Torx Head Sizes
Torx fasteners come in standard incremental sizes to match specific assembly and repair tasks. The “T” designation refers to the Torx head size. Torx sizes indicate the overall width of the head from point to point on the star. The maximum torque range indicates the tightening force a fastener is designed to withstand. The following table lists common Torx screwdriver head sizes and attributes:
| Torx Size | Point to Point | Maximum Torque Range (Nm) | |
| Inch | Metric | ||
| T2 | 0.036 | 0.91 | 0.07-0.09 |
| T4 | 0.050 | 1.27 | 0.22-0.28 |
| T6 | 0.066 | 1.67 | 0.75-0.9 |
| T8 | 0.09 | 2.3 | 2.2-2.6 |
| T10 | 0.107 | 2.71 | 3.7-4.5 |
| T15 | 0.128 | 3.25 | 6.4-7.7 |
| T20 | 0.151 | 3.83 | 10.5-12.7 |
| T25 | 0.173 | 4.4 | 15.9-19 |
| T27 | 0.195 | 4.95 | 22.5-26.9 |
| T30 | 0.216 | 5.48 | 31.1-37.4 |
Product Highlight: JM-6125 by Jakemy
Jakemy is a seasoned manufacturer of precision screwdriver set tools. We deliver a wide range of solutions in the category. One of our top-selling items is the JM-6125 screwdriver set with Torx. It’s fitted with 47 precision screwdriver bits and 9 socket bits. Key characteristics include:
- Torx bit sizes ranging from T2 to T30for electronics and appliances
- Hardened chrome-plated steel construction for durability
- Uniform profile ensures proper fit and maximum torque transfer
- Self-centering properties reduce cam-out and rounding risks
- Angled design allows access to recessed fasteners
Torx Screwdrivers: Variants
While the standard Torx screwdriver head design excels at general applications, specialized variants exist to handle unique challenges. These include:
- Standard Torx
This common screwdriver Torx head features six precision points that transfer torque effectively without camming out. Its balanced profile works well for general industrial and do-it-yourself tasks. Sizes range from T6 to T60 to handle various assemblies.
- Torx Plus
Torx Plus’s reinforced side walls and more square lobes provide extra strength against foreign object intrusion and broken fasteners. The self-extracting quality helps remove seized screws. This Torx screwdriver head design is identified by a “+” symbol after the size for compatibility.
- Torx TTap
Thin walls and a tapered tip allow these variants to easily cut threads into plastics and composites during installation. They are useful for the assembly of certain enclosures and housings. The tapered tip makes internal tapping straightforward.
- Security Torx
This tamper resistant Torx screwdriver head features entangled steel pin construction within to resist unauthorized removal of valuable components. It’s commonly used in high-security applications like automobile ignition systems. Multiple pin configurations increase protection against tampering.
- External Torx
This Torx screwdriver head design variant features externally accessible points for recesses that lack interior access. For instance, some enclosed motors or gearboxes. The design enables fastening into confined spaces. It’s an ideal choice for fully enclosed electrical components.
Conclusion
Torx screwdriver heads provide a secure, slip-resistant fit thanks to their unique star-shaped geometry. They boast cam-out-preventing quality with availability in multiple head sizes and variants. This makes Torx fasteners and drivers suitable for a vast range of precision assembly and repair applications. At Jakemy, we offer reliable Torx tooling like our popular JM-6125. Browse our website for more about our screwdriver sets.