English
TORX® is a screw head design that provides high grip and reliable power transmission
With TORX®, compared to the traditional hexagonal profile (inside hexagon and outside hexagon), the screw and tool are subjected to less radial stress and are therefore less prone to damage. Torque is transmitted more directly via the radial parts of the tooth flanks rather than via the almost tangential surfaces of the hexagon.
Why is this important?
- The TORX® profile enables efficient working and reduces the risk of the tool slipping in the screw head.
How is the size of a TORX® screw determined?
| Outside TORX® | ||||||||||||||||||||
| output size | E4 | E5 | E6 | E7 | E8 | E10 | E11 | E12 | E14 | E16 | E18 | E20 | E22 | E24 | ||||||
| Flank dimension | 3.86 mm | 4.75 mm | 5.74 mm | 6.22 mm | 7.52 mm | 9.42 mm | 10.08 mm | 11.17 mm | 12.9 mm | 14.76 mm | 16.7 mm | 18.49 mm | 20.32 mm | 22.16 mm | ||||||
| Internal TORX® | ||||||||||||||||||||
| output size | T5(H) | T6(H) | T7(H) | T8(H) | T9(H) | T10(H) | T15(H) | T20(H) | T25(H) | T27(H) | T30(H) | T40(H) | T45(H) | T50(H) | T55(H) | T60(H) | T70(H) | T80(H) | T90(H) | T100(H) |
| Flank dimension | 1.42 mm | 1.67 mm | 1.99 mm | 2.31 mm | 2.5 mm | 2.74 mm | 3.27 mm | 3.86 mm | 4.43 mm | 4.99 mm | 5.52 mm | 6.65 mm | 7.82 mm | 8.83 mm | 11.22 mm | 13.25 mm | 15.54 mm | 17.59 mm | 19.95 mm | 22.15 mm |
Wikipedia:
Due to the rounded inner points, the notch effect on the circumference of the screw head or tool is very low with TORX®.
There are inside TORX® screws and outside TORX® screws. The designation ‘T’ stands for the TORX® internal profile and was the first to be launched on the market. Subsequently, the outside TORX® profile ‘E’ (= External) was developed, which is why the designations of the individual profiles are usually abbreviated to ‘T’, ‘TX’ or ‘TE’. The size designations for internal TORX® tools were determined arbitrarily; in contrast, for outside TORX®, the size is derived from the diagonal dimension of the flanks.
Inside TORX® screws are also designated as I-star / internal star (English: star). Following the convention used for common outside and inside hexagon screws, the TORX® key engagement is designated ‘hexalobular’ in German standards.
TORX® (from the English word ‘torque’) is a trademark of Acument Intellectual Properties LLC. HAZET holds the manufacturing licence for TORX® tools.
The standard designation is ‘internal hexagon’ or ‘external hexagon’.
[Wikipedia / Further explanation: https://de.wikipedia.org/wiki/Torx]
By the way:
Here you’ll find an overview of common screw profiles
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