Machinery's Handbook, 31st Edition
1718
Metric Screws and Bolts Table 5. American National Standard Metric Hex Lag Screws ANSI/ASME B18.2.3.8M-1981 (Withdrawn)
Indentation and Configuration Optional
K
60° Approx.
K 1
P 60°
T
V
D s
E
D 1
Gimlet Point
R
B
S
L
Detail of Thread
15°–30°
Width Across Flats, S
Width Across Corners, E
Wrench ing Height, K 1
Head Height, K
Body Diameter, D s
Nominal Screw Dia., D
Max. 5.48 6.48 8.58 10.58 12.70 16.70 20.84 24.84
Min. 4.52 5.52 7.42 9.42 11.30 15.30 19.16 23.16
Max. 8.00 10.00 13.00 16.00 18.00 24.00 30.00 36.00
Min. 7.64 9.64
Max. 9.24 11.55 15.01 18.48 20.78 27.71 34.64 41.57
Min. 8.63 10.89 14.20 17.59 19.85 26.17 32.95 39.55
Max.
Min.
Min.
5 6 8
3.9 4.4 5.7 6.9
3.1 3.6 4.9 5.9 7.0 9.3
2.4 2.8 3.7 4.5 5.2 7.0 8.8
12.57 15.57 17.57 23.16 29.16 35.00
10 12 16 20 24
8.0 10.8 13.4 15.9
11.6 14.1
10.5
Thread Dimensions
Thread Dimensions
Nominal Screw Dia., D
Nominal Screw Dia., D
Flat at Root, V
Depth of Thread, T
Flat at Root, V
Depth of Thread, T
Thread Pitch, P
Root Dia., D 1
Thread Pitch, P
Root Dia., D 1
5 6 8
2.3 2.5 2.8 3.6
1.0 1.1 1.2 1.6
0.9 1.0 1.1 1.4
3.2 4.0 5.8 7.2
12 16 20 24
4.2 5.1 5.6 7.3
1.8 2.2 2.4 3.1
1.6 2.0 2.2 2.8
8.7 12.0 15.6 18.1
10
REDUCED BODY DIAMETER
D s
D si
L sh
Shoulder Diameter, D s
Shoulder Length, L sh
Shoulder Length, L sh
Shoulder Diameter, D s
Nominal Screw Dia., D
Nominal Screw Dia., D
Max. 5.48 6.48 8.58 10.58
Min. 4.52 5.52 7.42 9.42
Max.
Min. 2.5 3.0 4.0 5.0
Max. 12.70 16.70 20.84 24.84
Min. 11.30 15.30 19.16 23.16
Max. 7.0 9.0 11.0 13.0
Min. 6.0 8.0 10.0
5 6 8
3.5 4.0 5.0 6.0
12 16 20 24
10 12.0 All dimensions are in millimeters. Reduced body diameter, D si , is the blank diameter before roll ing. Shoulder is mandatory when body diameter is reduced.
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