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Torx Head Fastener Basic Dimensions

ISO Metric Hardware Specification
ANSI Inch Unit Hardware Specifications

Torx Head Fastener Basic Dimensions per. ISO 10664

Torx Head Fastener Basic Dimensions per. ISO 10664

Torx is the name industry name and Hexalobular Socket Head is the industry specification.

Torx (Hexalobular)
Socket Number
Dimension
A
Dimension
B
6
1,75
1,27
8
2,4
1,75
10
2,8
2,05
15
3,35
2,4
20
3,95
2,85
25
4,5
3,25
30
5,6
4,05
40
6,75
4,85
45
7,93
5,64
50
8,95
6,45
55
11,35
8,05
60
13,45
9,6
70
15,7
11,2
80
17,75
12,8
90
20,2
14,4
100
22,4
16

 

Fallaway Allowance

Socket No.
6
8
10
15
20
25
30
40
45
50
55
60
70
80
90
100
Fallaway
allowance f
0,31
0,41
0,51
0,51
0,64
0,64
0,76
0,89
1,02
1,27
1,27
1,27
1,52
1,52
1,78
2,03

 

Torx Head Fastener Basic Dimensions per. ISO 10664

The correlations of dimensions given in figure above is intended to support the drawing of the driving feature only, e.g. when using a CAD system.

B ~ 0,72 A
re ~ 0,1 A
ri ~ 0,175 A

Note: Circle is tangential to the socket contour at points 1, 2 and 3.

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