Page 707 - Mastik®

Internal drives for screws Design guideline

Torx plus ®
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– The Torx plus drive is defined by ellipses and represents an improvement over the
original hexalobular system which is defined by a series of radii.
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– The Torx plus system is compatible with the tools provided for the (Torx ) hexalobu-
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lar system. However, the specific geometric benefits of Torx plus can only optimize
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assembly when using the Torx plus screwdriver bits (tool).
– The general dimensions are given in the product designations in the catalogue.

Technical advantages of hexalobular socket and Torx plus drives and their economic benefit
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No need for pressure force as it is necessary when using cross recessed drives.
Can accept the tightening torques for all property classes.

No deterioration of the internal drive; hence reliable unscrewing.
Very low assembly tool wear.

High rationalisation potential for the assembly technique, as the drive is suitable
for all types of screw

Economic head from the aspect of size, form and material, corresponding to
cheese head screws DIN 84 and DIN 7984, however able to cope with high
stresses with respect to permissible surface pressure.
No problem assembling round head screws according to ISO 7380 and recessed
flat head screws DIN 7991. The high property class 10.9 of these screws per-
mitting increased strength of the hexagon socket can be reduced to property
class 8.8.

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The hexalobular socket and the Torx plus systems have benefits due to their design parameters
60° 15° 0°

Force transmission angle of 60° Force transmission angle of 15° Force transmission angle of 0°
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with hexagon socket drives with hexalobular socket drives with Torx plus drives

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– The effective transmission angle of the hexalobular socket is 15° while that of a Torx plus is 0°. A 0° drive angle has the advantage
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that the entire force acting on the drive is used to drive the screw in. The geometries of the hexalobular socket and the Torx plus
therefore extend the service life of the screwdriver bits by up to 100%.
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– The cross section of the Torx plus drive is larger compared to the hexalobular drive system. Therefore the torsional strength of the
driving tool is increased.
– The good force transmission enables low penetration depths.