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Torx Anti-theft Screw

Torx Anti-theft Screw

Head type: pan head with plum blossom column

Material: stainless steel 304

Surface treatment: clean qualities

Special effects: rust-proof and durable

Specifications: M3-20


Application: Machine Parts, Bicycle, Safety Box, Manhole Cover etc.

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Torx screws are commonly found on automobiles, motorcycles, bicycle brake systems (disc brakes), hard disk drives, computer systems and consumer electronics. Initially, they were sometimes used in applications requiring tamper resistance, since the drive systems and screwdrivers were not widely available; as drivers became more common, tamper-resistant variants, as described below, were developed.[4]Torx screws are also becoming increasingly popular in construction industries.


By design, Torx head screws resist cam-out better than Phillips head or slot head screws.[1] Whereas Phillips heads were allegedly designed to cause the driver to cam out, to prevent overtightening, Torx heads were designed to prevent cam-out. The development of better torque-limiting automatic screwdrivers for use in factories allowed this change. Rather than rely on the tool to slip out of the screw head when a desired torque level is reached (which risks damage to the driver tip, screw head, and/or workpiece), torque-limiting driver designs achieve a desired torque consistently.



For the Torx type of design, the angle is much closer to 90o than in the case of the hex head, and so for a given torque the potentially damaging radial force is much lower. This property allows the head of the fastener to be smaller for the same required torque, which can be an advantage in applications where space to accommodate the head is limited.

The disadvantage on older Torx heads is that the smaller internal "splines" can corrode relatively easily and cause the Torx driver to slip and damage the head, making it more difficult to remove than the traditional hexagon head.

Torx head sizes are described using the capital letter "T" followed by a number ranging from T1 to T100.[5] A smaller number corresponds to a smaller point-to-point dimension of the screw head (diameter of circle circumscribed on the cross-section of the tip of the screw driver). Common sizes include T10, T15, and T25, while T5.5, T35, and T47 tend to see specialized use. Only the proper driver can drive a specific head size without risk of damaging the driver or screw. The same series of Torx drivers is used to drive SAE, metric and other thread system fasteners, reducing the number of bit sizes required.

The "external" variants of Torx head sizes (see below) are described using the capital letter "E" followed by a number ranging from E4 to E44.[6] The "E" numbers are different from the "T" numbers of the same size: for example, an E4 Torx socket fits a T20 head.[5]


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