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Torx Screws

Also known as star, 6 lobe, and hexalobular internal. Once, they were typically used in applications requiring tamper resistance; as drivers became more common, specific tamper-resistant variants were developed. The torx drive design allows for a higher torque to be exerted than a similarly sized conventional hex socket head. The torx drive design is particularly well suited for use with torque control features on a drill driver, making it easier to acheive a consistent fit.
Fastener Material Key
A2
A2 Stainless Steel - Also known as grade 304 or 18/8. A general purpose grade of stainless steel.
A4
A4 Stainless Steel - Also known as grade 316 or 18/8/3. A higher corrosion resistant, marine grade of stainless steel.
BZP
Bright Zinc Plated (BZP) Steel - Non-stainless standard steel grade offering a basic level of corrosion resistance.
YZP
Yellow Zinc Plated (YZP) Steel - Non-stainless standard steel grade offering a basic level of corrosion resistance but with a Bright Yellow finish.

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