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Metric Hex Lag Screws Size Table

ANSI Hardware Design and Engineering References

Standard Metric Hex Lag Screws Size Table per. ANSI B18.2.3.8M–1981, R1991

Lag Screw Dimensions

Lag
Screw
Dia.
D
Body
Diameter
Ds
Width
Across
Flats
S
Width
Across
Corners
E
Head
Height
K
Wrenching
Height
K1
Max
Min
Max
Min
Max
Min
Max
Min
Min
5
5.48
4.52
8.00
7.64
9.24
8.63
3.9
3.1
2.4
6
6.48
5.52
10.00
9.64
11.55
10.89
4.4
3.6
2.8
8
8.58
7.42
13.00
12.57
15.01
14.20
5.7
4.9
3.7
10
10.58
9.42
16.00
15.57
18.48
17.59
6.9
5.9
4.5
12
12.70
11.30
18.00
17.57
20.78
19.85
8.0
7.0
5.2
16
16.70
15.30
24.00
23.16
27.71
26.17
10.8
9.3
7.0
20
20.84
19.16
30.00
29.16
34.64
32.95
13.4
11.6
8.8
24
24.84
23.16
36.00
35.00
41.57
39.55
15.9
14.1
10.5
Lag
Screw
Dia.
D
Thread Dimensions

Nominal
Screw
Dia.
D

Thread Dimensions
Thread
Pitch
P
Flat
at
Root
V
Depth
of
Thread
T
Root
Dia.
D1
Thread
Pitch
P
Flat
at
Root
V
Depth
of
Thread
T
Root
Dia.
D1
5
2.3
1.0
0.9
3.2
12
4.2
1.8
1.6
8.7
6
2.5
1.1
1.0
4.0
16
5.1
2.2
2.0
12.0
8
2.8
1.2
1.1
5.8
20
5.6
2.4
2.2
15.6
10
3.6
1.6
1.4
7.2
24
7.3
3.1
2.8
18.1

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