Fasteners come in several shapes, sizes and drives. Whereas Flat-head and Phillips are the extra standard sorts, Vehicle, Computer systems and several other shopper electronics use a particular kind of Fastener generally known as Torx Screws. Technically, they Star screws and the “Torx” is only a trademark of such screws and drives by Camcar Textron. On this information, we’ll see all of the fundamentals of Torx Bits and several types of them. We will even draw a Torx Bit Sizes Chart to listing out dimensions of standard Torx bits.
Torx Screw and Torx Screwdrivers
Camcar Textron trademarked a particular screw drive with the title Torx. The principle attribute of this drive is its 6-point sample that appears like a star-shaped sample. Because of this, many began calling it a Star Screw.
The generic title for such screw and drives is Star whereas the favored title Torx is a trademark of Camcar Textron. Because the expiry, a number of producers began producing Torx bits.
One widespread downside with flat-head and Phillips is cam-out. It’s a course of the place the screwdriver driver slips out of the screwhead if the torque exceeds a restrict. The design of the Torx head prevents this cam-out and thereby causes much less harm to go.
Even in the event you apply a better torque than the restrict on a Torx screw, it won’t harm the screw head or the bit itself. Each the Torx screws and the screwdrivers can last more than different drive sorts.
The common Torx drive is named Inner Torx the place we insert the bit into the screw head. There’s additionally a Torx with a reverse design. We name it Exterior Torx. They’re just like Nuts and Sockets the place the bit or socket goes on prime of the screw or nut.
Totally different Forms of Torx
There’s a variation of the Torx generally known as Safety Torx. Different names are Tamper Resistant Torx, Tamper Proof Torx, Pin-in Torx and 6 Lobe Pin Torx. The principle distinction between an everyday Torx and a Safe Torx screw is the extra safety pin within the heart of the screw head.
Because of this, you can not use a regular 6-point Torx screwdriver on a Safe Torx screw.
Each Commonplace Torx and Safe Torx have a number of sorts. We are going to see few particulars about them earlier than trying on the Torx Bit Sizes Chart.
After the unique patent expired in 1990, Camcar Textron modified and improved the design of authentic Torx and launched a brand new model Torx Plus. Relying on inside or exterior drive, the Torx Plus is named Inner Plus and Exterior Plus respectively.
The design of the Torx Plus resembled that of a gear with extra sq. lobes. This design change resulted in utility of even better torque on the top with minimal put on.
Tamper Proof Torx (Safe Torx) model of the “Plus” had solely 5 Lobed as an alternative of 6. These aren’t that standard.
Another variations of Torx are Torx Paralobe, Torx Ttap, Torx Plus Maxx Stems and Audi Torx.
Torx Bit Sizes Chart
Like all different fasteners, even Torx screws can be found in several sizes. They comply with a particular ‘T’ sizing for the inner Torx an ‘E’ sizing for the exterior Torx. The dimensions of the screwdriver or the drive bit should match with the dimensions of the Torx screw.
For instance, when you’ve got a screw with TX dimension, then you must use a Torx Screwdriver or drive little bit of TX dimension solely.
Commonplace Torx Bit Sizes Chart
The next is a Torx Bit Sizes Chart for Inner Torx. Two dimensions are necessary with respect to Torx screws. They’re Level to Level and Diameter of the screw threads.
| Torx Dimension | Level to Level | Diameter | Most Torque | |
| inch | mm | Nm | ||
| T1 | 0.031 | 0.78 | — | 0.02 – 0.03 |
| T2 | 0.036 | 0.91 | — | 0.07 – 0.09 |
| T3 | 0.046 | 1.17 | — | 0.14 – 0.18 |
| T4 | 0.05 | 1.27 | — | 0.22 – 0.28 |
| T5 | 0.055 | 1.4 | — | 0.43 – 0.51 |
| T6 | 0.066 | 1.67 | M2 | 0.75 – 0.9 |
| T7 | 0.078 | 1.98 | M2.5 | 1.4 – 1.7 |
| T8 | 0.09 | 2.3 | M2.5 | 2.2 – 2.6 |
| T9 | 0.098 | 2.5 | M3 | 2.8 – 3.4 |
| T10 | 0.107 | 2.71 | M3 – M3.5 | 3.7 – 4.5 |
| T15 | 0.128 | 3.25 | M3.5 – M4 | 6.4 – 7.7 |
| T20 | 0.151 | 3.83 | M4 – M5 | 10.5 – 12.7 |
| T25 | 0.173 | 4.4 | M4.5 – M5 | 15.9 – 19 |
| T27 | 0.195 | 4.95 | M4.5 – M5 – M6 | 22.5 – 26.9 |
| T30 | 0.216 | 5.48 | M6 – M7 | 31.1 – 37.4 |
| T40 | 0.26 | 6.6 | M7 – M8 | 54.1 – 65.1 |
| T45 | 0.306 | 7.77 | M8 – M10 | 86 – 103.2 |
| T50 | 0.346 | 8.78 | M10 | 132 – 158 |
| T55 | 0.44 | 11.17 | M12 | 218 – 256 |
| T60 | 0.519 | 13.18 | M14 | 379 – 445 |
| T70 | 0.61 | 15.5 | M16 | 630 – 700 |
| T80 | 0.69 | 17.52 | M18 | 943 – 1048 |
| T90 | 0.784 | 19.91 | M20 | 1334 – 1483 |
| T100 | 0.871 | 22.12 | M22 | 1843 – 2048 |
Exterior Torx Bit Sizes Chart
We are able to additionally listing out the Torx Bit Sizes Chart for Exterior Torx as nicely. Within the following desk, we’ve got some standard Exterior Torx Bit Sizes.
| Exterior Torx Dimension | Level to Level | Screw Diameter | |
| inch | mm | ||
| E4 | 0.15 | 3.8 | M3 |
| E5 | 0.185 | 4.7 | M4 |
| E6 | 0.22 | 5.7 | M5 |
| E7 | 0.244 | 6.2 | M6 |
| E8 | 0.3 | 7.5 | M6 – M7 |
| E10 | 0.37 | 9.4 | M8 |
| E11 | 0.4 | 10.1 | — |
| E12 | 0.43 | 11.1 | M10 |
| E14 | 0.5 | 12.9 | M12 |
| E16 | 0.57 | 14.7 | M12 |
| E18 | 0.65 | 16.6 | M14 |
| E20 | 0.72 | 18.4 | M16 |
| E24 | 0.87 | 22.1 | M18 |
Conclusion
Torx drive has a number of advantages over Phillips drives. Torx is a trademark title for Star drive by Camcar Textron. You possibly can see Torx Screws in computer systems, dwelling home equipment, cars. They’re noy appropriate with Hex drives and Allen Keys. It’s a must to use the proper dimension bit to tighten or loosen a Torx Screw.
On this information, we noticed the fundamentals of Torx Screws, Drives, and Totally different Forms of Torx Drives. After that, we additionally noticed the Torx Bit Sizes Chart for each Commonplace Torx and Exterior Torx (Socket fashion).
