As a security variant of TORX® screws, TORX® TR (tamper-resistant) features a pin that requires a specialty tool.

Why is this important?

• Tamper-resistant TORX® (Tamper TORX® for short) makes unauthorised loosening more difficult and is suitable for sensitive or safety-critical applications.

By the way:

• [Wikipedia / Further explanation: https://de.wikipedia.org/wiki/Torx#Torx-TR]
• Here you’ll find an overview of common screw profiles

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