What is a Torx Screwdriver Bit With a Hole in it Called?

The specific type of Torx screw that has a hole in the middle is known as “Torx Security” or “Tamper-Resistant Torx” (often abbreviated as TR Torx or simply Torx TR). These screws feature a small, cylindrical post in the center of the star-shaped recess, which requires a compatible Torx screwdriver with a corresponding hole in the tip to accommodate the post.

Torx Secuirty Concept and Usage:

The Torx Security screwdriver is designed to provide an additional layer of security and prevent unauthorized tampering or disassembly of hardware components. The unique design makes it difficult for standard Torx screwdrivers to engage with the recess, thus deterring tampering attempts. This feature is especially beneficial for securing sensitive equipment, electronics, and high-value items.

Torx Security Screwdriver System:

The Security Torx, also known as Tamper-Resistant Torx or Torx TR, is a variation of the original Torx screwdriver system. It was invented by Bernard S. Lobsinger and John A. Bingham, who were engineers at Camcar Textron, a US-based fastening solutions company. The patent for the Torx design was filed on June 28, 1967, and granted on September 29, 1970, under US Patent No. 3,530,453.

Invention and Development:

The invention of the Torx system was driven by the need for a more efficient and reliable fastening solution compared to traditional Phillips and flat head screws. The original Torx design featured a six-pointed star-shaped recess, which allowed for better torque transmission and reduced cam-out (slippage). However, as the popularity of Torx screws grew, there was an increasing demand for a tamper-resistant version to prevent unauthorized disassembly or tampering with sensitive equipment.

To address this need, the Security Torx was developed, which added a small cylindrical post in the center of the star-shaped recess. This modification required a compatible Torx screwdriver with a corresponding hole in the tip to accommodate the post, effectively deterring tampering attempts by those without the specialized tool.

Evolution and Impact:

Since its invention, the Security Torx has undergone various refinements to improve its efficiency and security features. One notable development is the introduction of different Torx sizes, denoted by a “T” followed by a number (e.g., T10, T20, T30, etc.). This sizing system allows for a wider range of applications across industries, further expanding the popularity of the Torx system.

The unique design of the Security Torx has contributed significantly to its widespread adoption and usage within various industries, such as electronics, automotive, aerospace, and consumer goods. Some notable applications of Security Torx screws include:

  • Electronics: Security Torx screws are commonly used in securing computer components, gaming consoles, and other electronic devices to prevent unauthorized access or tampering.
  • Automotive: In the automotive industry, Security Torx screws are used to secure various vehicle components, such as airbags, anti-theft devices, and other sensitive systems.
  • Aerospace: The aerospace industry employs Security Torx screws in various applications due to their high torque transmission capabilities and tamper-resistant design, ensuring the safety and reliability of critical systems.
  • Consumer Goods: High-end appliances, fitness equipment, and furniture often utilize Security Torx screws to deter theft or unauthorized disassembly.

The widespread use of Security Torx screws has had a significant impact on product security and longevity. The design prevents unauthorized access to sensitive components and reduces the risk of damage during assembly or disassembly, resulting in improved reliability and performance across various industries.

The invention and evolution of the Security Torx system have paved the way for a more secure and efficient fastening solution. Its unique design, combined with its numerous applications within various industries, has contributed to its popularity and widespread adoption, ultimately enhancing product security and reliability.

Advantages and Disadvantages of Torx Security Screwdrivers:


  • Enhanced Security: The primary advantage of using Torx security screwdrivers is their ability to work with tamper-resistant Torx screws, which feature a small cylindrical post in the center of the star-shaped recess. This design prevents standard Torx screwdrivers from engaging with the screw, making it difficult for unauthorized individuals to tamper with or disassemble sensitive equipment.
  • Superior Torque Transmission: Torx security screwdrivers inherit the benefits of the original Torx design, which offers better torque transmission compared to traditional Phillips or flat head screwdrivers. This reduces the risk of stripping or damaging the screw head and ensures a more secure fit.
  • Reduced Stripping Screws: The six-pointed star-shaped tip of the Torx security screwdriver provides a more secure engagement with the screw, minimizing the chances of slippage or stripping the screw when compared to other screwdriver types.
  • Durability: Torx security screwdrivers are built to last, as the reduced wear on the screwdriver tip results in a longer tool life compared to their Phillips or flathead counterparts.


  • Limited Compatibility: One of the main drawbacks of Torx security screwdrivers is their limited compatibility. They are specifically designed to work with Torx security screws and cannot be used with standard Torx or other screw types.
  • Availability and Cost: Torx security screwdrivers may not be as readily available as more common screwdriver types, and they can be more expensive due to their specialized design.
  • Inconvenience for Some Users: For individuals or businesses that have already invested in other types of screws and screwdrivers, switching to the Torx security system may be inconvenient and require additional investment in new tools.

Who Should Invest in Torx Security Screwdrivers?

Professionals and DIY enthusiasts who frequently work with sensitive equipment, high-value items, or products that require an added layer of security should consider investing in Torx security screwdrivers. This includes individuals working in industries such as electronics, automotive, aerospace, and consumer goods.

Tradeoffs and Considerations:

When evaluating Torx security screwdrivers for use in specific applications, it’s essential to weigh the benefits of enhanced security, superior torque transmission, and tool durability against the potential drawbacks of limited compatibility, availability, and cost. Additionally, users should consider the range of sizes they require for their specific projects, as Torx security screwdrivers come in various sizes to accommodate different screw types.

In Conclusion

Torx security screwdrivers offer several advantages over traditional screwdriver types, making them a valuable addition to any professional or DIY toolbox. However, users should carefully consider the tradeoffs and potential drawbacks before investing in these specialized tools. Overall, Torx security screwdrivers are a worthwhile investment for those who require enhanced security and superior performance in their fastening solutions.