Anixter Fasteners Hexalobular

HEXALOBULAR DRIVE SOCKET SCREWS

Fastener drive styles are generally selected based on

the type of application and the required clamping

force. This clamp load is used to determine the size

of fastener required to limit the applied stress of the

joint and it is also used to calculate the required

tightening torque. It is this tightening torque that

has the greatest influence when selecting a drive

style and there are a number of options available

depending on the particular application.

In the past, Pozi drives have been particularly popular

for low torque applications where the driver will cam

out to prevent over-tightening. Recently however, with

the development of better torque-limiting automatic

screwdrivers, manufacturers can now use more

effective tools to optimise the tightening process and

reduce losses and tool damage. Rather than relying

on the tool slipping out of the screw head when a

torque level is reached, the drivers are now designed

to constantly achieve the desired optimum torque,

thereby reducing damage to the driver tip, screw head

and workpiece.

This gave rise to the design of hexalobular style drive

systems where increased tool engagement virtually

eliminates camout ensuring a more controlled and

effective torque transfer. This greatly reduces the

end load requirements and can also reduce worker

fatigue and muscular stress during manual assembly.

Although these drive systems are not yet considered

to be off the shelf items they are increasing in

popularity and can now be found in a limited range

on the shelves of certain stockists. The following

diagram illustrates the features of hexalobular drives

that enhance performance.

Torx Drive

° Elliptical based geometry broadens the contact surface to maximise the engagement of driver

and recess, eliminating damage from point to point contact.

° Small drive angle (15 deg) optimises torque transmission virtually eliminating radial stresses

to increase tool life. This also enables the use of recesses with thinner walls.

° Six driving lobes offer faster tool engagement and maximises torque transfer with increased

torsional strength.

° Hexalobular tools seat both metric and imperial sized fasteners.

Torx PlusUntil recently the only available hexalobular drives were Torx drives, manufactured under license from a

company called Acument, the parent company of Textron Fastening Systems. This patent has now expired

and Acument are now marketing their new hexalobular drive.

This drive is claimed to have a genuine zero degree drive angle to further enhance the torque transmission

and eliminate radial forces. In addition to this Acument also claim a 50% reduction in driver tool tolerance

and boast a 25% average improvement in driver torsional strength.

This increase in performance comes with an increase in cost that many manufacturers may find difficulty

justifying, especially when there are now international standards available specifying standard hexalobular

drive screws that do not require a special license to manufacture.

Hexalobular Drive ScrewsThere are now various international standards available to cover hexalobular drive screws that offer the same

performance and use the same tooling, but do not require a special license to manufacture. This presents an

attractive alternative that can be sourced from an increased number of suppliers, without having to pay

a license fee required to manufacture to the Torx Drive specification. These ISO standards are listed below.

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This international standard specifies the shape and

basic dimensions of hexalobular internal driving

features for bolts and screws, including the gauging

limits and methods for GO and NO GO gauges. It also

defines the curvature of the contour of the hexalobular

internal driving feature along with information to draw

the driving feature listed in the Annex of the standard.

Counterbore: c ≤0.13mm up to socket

No.15, and ≤0.25mm over socket No.15.

Penetration depth r: see relevant

product standard.

Note: the contour of the bottom of the

socket beyond the gauge is at the option

of the manufacturer.

DIN EN ISO 10664 : Hexalobular Internal Driving Features for Bolts and Screws

ISO Hexalobular Drive Dimensions (mm)Nominal Dimensions Gauging Limits (GO)

Recess Reference A B A B6 1.75 1.27 1.695 - 1.709 1.210 - 1.224

8 2.4 1.75 2.335 - 2.349 1.672 - 1.686

10 2.8 2.05 2.761 - 2.776 1.979 - 1.993

15 3.35 2.4 3.295 - 3.309 2.353 - 2.367

20 3.95 2.85 3.879 - 3.893 2.764 - 2.778

25 4.5 3.25 4.451 - 4.465 3.170 - 3.185

30 5.6 4.05 5.543 - 5.557 3.958 - 3.972

40 6.75 4.85 6.673 - 6.687 4.766 - 4.780

45 7.93 5.64 7.841 - 7.856 5.555 - 5.570

50 8.95 6.45 8.857 - 8.872 6.366 - 6.380

55 11.35 8.05 11.245 - 11.259 7.930 - 7.945

60 13.45 9.6 13.302 - 13.317 9.490 - 9.504

ISO 14583: Hexalobular Socket Pan Head ScrewsThis standard covers hexalobular socket pan head screws of product grade A size M2 up to and including M10. For specifications not listed in this standard

see existing international standards like ISO 261, ISO 888, ISO 898-1, ISO 965-2, ISO 3506-1, ISO 4759-1.

Thread d M2 M2,5 M3 (M3,5)a M4 M5 M6 M8 M10P b 0,4 0,45 0,5 0,6 0,7 0,8 1,0 1,25 1,5

a max. 0,8 0,9 1 1,2 1,4 1,6 2 2,5 3

b min. 25 25 25 38 38 38 38 38 38

da max. 2,6 3,1 3,6 4,1 4,7 5,7 6,8 9,2 11,2

dknom. = max. 4,0 5,0 5,6 7,00 8,00 9,50 12,00 16,00 20,00

min. 3,7 4,7 5,3 6,64 7,64 9,14 11,57 15,57 19,48

knom. = max. 1,60 2,10 2,40 2,60 3,10 3,70 4,6 6,0 7,50

min. 1,46 1,96 2,26 2,46 2,92 3,52 4,3 5,7 7,14

r max. 0,1 0,1 0,1 0,1 0,2 0,2 0,25 0,4 0,4

rf 3,2 4 5 6 6,5 8 10 13 16

x max. 1,0 1,1 1,25 1,5 1,75 2,0 2,5 3,2 3,8

“Hexalobular socket"

ASocket No. 6 8 10 15 20 25 30 45 50

ref. 1,75 2,4 2,8 3,35 3,95 4,5 5,6 7,95 8,95

tmax. 0,77 1,04 1,27 1,33 1,66 1,91 2,42 3,18 4,02

min. 0,63 0,91 1,01 1,07 1,27 1,52 2,02 2,79 3,62

Dimensions in millimetres





ISO 14584: Hexalobular Socket Raised Countersunk Head ScrewsM2 up to and including M10. For specifications not listed in this standard see existing international standards like ISO 261, ISO 888, ISO 898-1, ISO 965-2,

ISO 3506-1, ISO 4759-1.

Thread d M2 M2,5 M3 (M3,5)a M4 M5 M6 M8 M10

P b 0,4 0,45 0,5 0,6 0,7 0,8 1,0 1,25 1,5

a max. 0,8 0,9 1 1,2 1,4 1,6 2 2,5 3

b min. 25 25 25 38 38 38 38 38 38

dkc

theoretical max. 4,4 5,5 6,3 8,2 9,4 10,4 12,6 17,3 20,0

actualnom. = max. 3,8 4,7 5,5 7,30 8,40 9,30 11,30 15,80 18,30

min. 3,5 4,4 5,2 6,94 8,04 8,94 10,87 15,37 17,78

f 0,5 0,6 0,7 0,8 1 1,2 1,4 2 2,3

kc nom. = max. 1,2 1,5 1,65 2,35 2,7 2,7 3,3 4,65 5

r max. 0,5 0,6 0,8 0,9 1,0 1,3 1,5 2,0 2,5

rf 4 5 6 8,5 9,5 9,5 12 16,5 19,5

x max. 1,0 1,1 1,25 1,5 1,75 2,0 2,5 3,2 3,8


ASocket No. 6 8 10 15 20 25 30 45 50

ref. 1,75 2,4 2,8 3,35 3,95 4,5 5,6 7,95 8,95

tmax. 0,77 1,04 1,15 1,53 1,80 2,03 2,42 3,31 3,81

min. 0,63 0,91 0,88 1,27 1,42 1,65 2,02 2,92 3,42

ISO 14580: Hexalobular Socket Cheese Head ScrewsThis international standard specifies the characteristics of hexalobular socket cheese head screws in product grades A with thread sizes from M2 up to and including M10.

If in special cases, specifications other than those listed in this standard are required, they should be selected from existing international standards like ISO 261, ISO

888, ISO 898-1, ISO 965-2, ISO 3506-1, ISO 4759-1.



Thread d M2 M2,5 M3 (M3,5)a M4 M5 M6 M8 M10

P b 0,4 0,45 0,5 0,6 w0,7 0,8 1,0 1,25 1,5

a max. 0,8 0,9 1 1,2 1,4 1,6 2 2,5 3

b min. 25 25 25 38 38 38 38 38 38

dknom. = max. 3,80 4,50 5,50 6,00 7,00 8,50 10,00 13,00 16,00

min. 3,62 4,32 5,32 5,82 6,78 8,28 9,78 12,73 15,73

da max. 2,6 3,1 3,6 4,1 4,7 5,7 6,8 9,2 11,2

kc nom. = max. 1,55 1,85 2,40 2,60 3,10 3,65 4,40 5,80 6,90

min. 1,41 1,71 2,26 2,46 2,92 3,47 4,10 5,50 6,54

r max. 0,1 0,1 0,1 0,1 0,2 0,2 0,25 0,4 0,4

w min. 0,5 0,7 0,75 1,0 1,1 1,3 1,6 2 2,4

x max. 1,0 1,1 1,25 1,50 1,75 2,0 2,5 3,2 3,8


ASocket No. 6 8 10 15 20 25 30 45 50

ref. 1,75 2,4 2,8 3,35 3,95 4,5 5,6 7,95 8,95

tmax. 0,84 0,91 1,27 1,33 1,66 1,91 2,29 3,05 3,43

min. 0,71 0,78 1,01 1,07 1,27 1,52 1,90 2,66 3,04




ISO 14584: Hexalobular Socket Raised Countersunk Head ScrewsM2 up to and including M10. For specifications not listed in this standard see existing international standards like

ISO 261, ISO 888, ISO 898-1, ISO 965-2, ISO 3506-1, ISO 4759-1.



ISO 14586: Hexalobular Socket Countersunk Head Tapping ScrewsThis international standard covers the characteristics of hexalobular socket countersunk head tapping screws

with thread sizes from ST2.9 to ST6.3 inclusive. If specifications other than those listed in this standard are

required they should be taken from existing international standards such as ISO 1478, ISO 2702, ISO 4759-1.

Thread Sizes ST2,9 ST3,5 ST4,2 ST4,8 ST5,5 ST6,3

P a 1,1 1,3 1,4 1,6 1,8 1,8

ab 1,1 1,3 1,4 1,6 1,8 1,8

da max. 3,5 4,1 4,9 5,6 6,3 7,3

dknom. = max. 5,6 7,00 8,00 9,50 11,00 12,00

min. 5,3 6,64 7,64 9,14 10,57 11,57

knom. = max. 2,40 2,60 3,1 3,7 4,0 4,6

min. 2,15 2,35 2,8 3,4 3,7 4,3

r max. 0,1 0,1 0,2 0,2 0,25 0,25

rf 5 6 6,5 8 9 10

y ref.cType C 2,6 3,2 3,7 4,3 5 6,0

Type F 2,1 2,5 2,8 3,2 3,6 3,6

Type R — 2,7 3,2 3,6 4,3 5


ASocket No. 10 15 20 25 25 30

ref. 2,8 3,35 3,95 4,5 4,5 5,6

tmax. 1,27 1,40 1,80 2,03 2,03 2,42

min. 1,01 1,14 1,42 1,65 1,65 2,02


P a 1,1 1,3 1,4 1,6 1,8 1,8

ab 1,1 1,3 1,4 1,6 1,8 1,8

dkc

theoretical max. 6,3 8,2 9,4 10,4 11,5 12,6

actualmax. 5,5 7,3 8,4 9,3 10,3 11,3

min. 5,2 6,9 8,0 8,9 9,9 10,9

kc max. 1,7 2,35 2,6 2,8 3 3,15

r max. 1,2 1,4 1,6 2 2,2 2,4

y ref.dType C 2,6 3,2 3,7 4,3 5 6

Type F 2,1 2,5 2,8 3,2 3,6 3,6

Type R — 2,7 3,2 3,6 4,3 5


ASocket No. 10 15 20 25 25 30

ref. 2,8 3,35 3,95 4,5 4,5 5,6

tmax. 0,91 1,3 1,58 1,78 2,03 2,42

min. 0,65 1,0 1,14 1,39 1,65 2,02




ISO 14587: Hexalobular Socket Raised Countersunk Head Tapping ScrewsThis international standard specifies the characteristics of hexalobular socket raised countersunk head tapping

screws with thread sizes from ST2.9 to ST6.3 inclusive. If specifications other than those listed in this standard are

required they should be taken from existing international standards such as ISO 1478, ISO 2702, ISO 4759-1.


P a 1,1 1,3 1,4 1,6 1,8 1,8

ab 1,1 1,3 1,4 1,6 1,8 1,8

dkc

theoretical max. 6,3 8,2 9,4 10,4 11,5 12,6

actualmax. 5,5 7,3 8,4 9,3 10,3 11,3

min. 5,2 6,9 8,0 8,9 9,9 10,9

f max. 0,7 0,8 1 1,2 1,3 1,4

r max. 1,7 2,35 2,6 2,8 3 3,15

rf max. 1,2 1,4 1,6 2,0 2,2 2,4

kc max. 6,0 8,5 9,5 9,5 11 12

y ref.dType C 2,6 3,2 3,7 4,3 5,0 6

Type F 2,1 2,5 2,8 3,2 3,6 3,6

Type R 2.7 3,2 3,6 4,3 5


ASocket No. 10 15 20 25 25 30

ref. 2,8 3,35 3,95 4,5 4,5 5,6

tmax. 1,27 1,40 1,80 2,03 2,03 2,42

min. 1,01 1,14 1,42 1,65 1,65 2,02





DIN EN ISO 14579 : Hexalobular Socket Head Cap ScrewsThis international standard specifies the

characteristics of hexalobular socket head cap screws

with thread sizes from M2 up to and including M20,

of product grade A.

If in special cases, specifications other than those

listed in this standard are required, they should be

selected from existing international standards like ISO

261, ISO 888, ISO 898-1, ISO 965-2, ISO 965-3, ISO

3506-1, ISO 4759-1.

Maximum under head fillet: lf max= 1.7 rmax ; rmax=

(da1 max – ds max)/2 ; rmin See table.

a: ds applies if values of ls min are specified

b: Point chamfered or for sizes M4 and below “as

rolled”, see ISO 4753

c: Incomplete thread u≤ 2P

d: Top edge of head may be rounded or chamfered

as shown at the direction of the manufacturer

e: Bottom edge of head may be rounded or

chamfered to dw but in every case shall be free

from burrs

f: Reference datum for dw

Thread Sizes M2 M2,5 M3 M4 M5 M6 M8 M10 M12 (M14)f M16 (M18)f M20

P a 0,4 0,45 0,5 0,7 0,8 1 1,25 1,5 1,75 2 2 2,5 2,5

bb ref. 16 17 18 20 22 24 28 32 36 40 44 48 52

dk

max.c 3,80 4,50 5,50 7,00 8,50 10,00 13,00 16,00 18,00 21,00 24,00 27,00 30,00max.d 3,98 4,68 5,68 7,22 8,72 10,22 13,27 16,27 18,27 21,33 24,33 27,33 30,33

min. 3,62 4,32 5,32 6,78 8,28 9,78 12,73 15,73 17,73 20,67 23,67 26,67 29,67

da max. 2,6 3,1 3,6 4,7 5,7 6,8 9,2 11,2 13,7 15,7 17,7 20,2 22,4

dsmax. 2,00 2,50 3,00 4,00 5,00 6,00 8,00 10,00 12,00 14,00 16,00 18,00 20,00

min. 1,86 2,36 2,86 3,82 4,82 5,82 7,78 9,78 11,73 13,73 15,73 17,73 19,67

lf max. 0,51 0,51 0,51 0,6 0,6 0,68 1,02 1,02 1,45 1,45 1,45 1,87 2,04

kmax. 2,00 2,50 3,00 4,00 5,00 6,0 8,00 10,00 12,00 14,00 16,00 18,00 20,00

min. 1,86 2,36 2,86 3,82 4,82 5,7 7,64 9,64 11,57 13,57 15,57 17,57 19,48

r min. 0,1 0,1 0,1 0,2 0,2 0,25 0,4 0,4 0,6 0,6 0,6 0,6 0,8

v max. 0,2 0,25 0,3 0,4 0,5 0,6 0,8 1 1,2 1,4 1,6 1,8 2

dw min. 3,48 4,18 5,07 6,53 8,03 9,38 12,33 15,33 17,23 20,17 23,17 25,87 28,87

w min. 0,55 0,85 1,15 1,4 1,9 2,3 3,3 4 4,8 5,8 6,8 7,8 8,6


ASocket No. 6 8 10 20 25 30 45 50 55 60 70 80 90

ref. 1,75 2,4 2,8 3,95 4,5 5,6 7,95 8,95 11,35 13,45 15,7 17,75 20,2

tmax. 0,84 1,04 1,27 1,80 2,03 2,42 3,31 4,02 5,21 5,99 7,01 8,00 9,20

min. 0,71 0,91 1,01 1,42 1,65 2,02 2,92 3,62 4,82 5,62 6,62 7,50 8,69


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