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BS 2485 T-Bolts T-Nuts Dimensions

Engineering ANSI Hardware Design Data
Engineering Metric Hardware Design Data

T-Bolts and T-Nuts Dimensions per. BS 2485

T-Nuts Dimensions per. BS 2485

T-Bolts Dimensions per. BS 2485

All dimension in mm

Designation
of
T-bolt
and
diameter
of
thread K

Width
head
(square)
B2

Depth
head
C2 tol.
±0.25
Length
shoulder
N
Dia.
of
bolt
A2
Cham
E
max.
Radius
R
max.
Width
T-nut
shank G
Height
T-nut
H
Cham
F
max.
max.
nom.
tol.
nom.
tol.
M4
9
+ 0
- 0.5
2.5
–
4
1.0
1.0
5
-0.3
-0.5
6
0.3
x
45°
M5
10
4
–
5
6
8
M6
13
6
–
6
8
10
M8
15
6
–
8
10
12
M10
18
7
–
10
12
-0.03
-0.06
16
M12
22
8
–
12
14
19
M16
28
10
–
16
1.5
18
25
M20
34
14
–
20
22
30
M24
43
18
20
26
28
40
M30
53
23
20
33
36
-0.4
-0.7
45
M36
64
28
25
39
42
55
M42
75
32
25
46
2.5
48
65
M48
85
36
30
52
54
-0.4
-0.8
75

 

 

Dia. of
thread
K
Recommended length of bolt stem L
Length of
threaded
portion of
bolt stem M
M4
M5
M6
M8
M10
M12
M16
M20
30
30
-
-
-
-
-
-
40
40
-
-
-
-
-
-
50
50
-
-
-
-
-
-
60
60
60
60
60
-
-
-
70
70
70
70
70
70
70
70
80
80
80
80
80
80
80
80
100
100
100
100
100
100
100
100
125
125
125
125
-
-
-
-
160
160
160
160
-
-
-
-
180
180
180
180
-
-
-
-
200
200
-
-
-
-
-
-
250
250
-
-
-
-
-
-
300
300
-
-
-
-
-
-
For L ≤ 100
M = 0.5 L
M24
M30
M36
M42
M48
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
100
125
160
180
200
250
300
For L >100
M = 0.3 L

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