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T-Slot Profile Design per. BS 2485

Engineering ANSI Hardware Design Data
Engineering Metric Hardware Design Data

T-Slot Profile Design per. BS 2485

T-Slot Profile Design per. BS 2485

Dimensions in mm
(avoid pitch values in brackets as they lead to weakness)

Designations
of T-slot
Width of
throat
A1
Depth of
recess
c1
Width
of
recess
B1
Overall
depth of
T-slot H
 
Nominal
Ordinary
(H12)
For
use
as
tenon
(HB)
min..
max.
min.
max.
min.
max
M4
M5
5
6
+0.12
0
+0.18
0
10
11
11
12.5
3.5
5
4.5
6
8
11
10
13
M6
M8
8
10
+0.15
0
+0.22
0
14.5
16
16
18
7
7
8
8
15
17
18
21
M10
M12
M16

12
14
18
+.018
0
+0.022
0
19
23
30
21
25
32
8
9
12
9
11
14
20
23
30
25
28
36
M20
M24
22
28
+0.21
0
+.027
0
37
46
40
50
16
20
18
22
38
48
45
56
M30
M36
M42
36
42
48
+0.25
0
+0.033
0
56
68
80
60
2
85
25
32
36
28
35
40
61
74
84
71
85
95
M48
54
+0.30
0
+.046
0
90
95
40
44
94
106

 

Designations
of T-slot
Chamfer 45°
or radius
Pitch
P
K
max.
F
max.
G
max.
M4
M5
1.0
1.0
0.6
0.6
1.0
1.0
  
 
20
25
25
62
32
40
M6
M8
1.0
1.0
0.6
0.6

1.0
1.0
 
32
40
40
50
50
63
M10
M12
M16
1.0
1.0
1.0
 
0.6
1.0
1.0
1.0
1.0
1.0
(40)
(50)
(63)
50
63
80
63
80
100
80
100
125
M20
M24
1.6
2.5
1.0
1.0
1.0
1.0
(80)
100
100
125
125
160
160
200
M30
M36
M42
2.5
2.5
2.5
1.0
1.6
2.0
1.0
4.0
6.0
125
160
200
160
200
250
200
250
320
250
320
400
M48
2.5
2.0
6.0
250
320
400
500

Tolerance of T-slots

Pitch
mm
Tolerance
mm
20 to 25
±0.2
32 to 100
±0.3
125 to 250
±0.5
320 to 500
±0.8

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