Table 6. American National Standard Hex Lag Screws ANSI/ASME B18.2.1-2012
60° Approx
H
S
F
P 60°
Cone Point
T
B
E
G
60° Approx
D 1
R
Gimlet Point
L
Detail of Thread
30° +0° –15°
Body or Shoulder Dia. E
Width Across Corners G
Shoulder Length S
Radius of Fillet R
Width Across Flats F
Height H
Thread Dimensions
Nominal Size a or Basic Product Dia.
Thds. per Inch
Pitch P 0.091 0.100 0.111 0.143 0.143 0.167 0.200 0.222 0.250 0.286 0.308 0.308
Flat at Root B
Depth of Thd. T
Root Dia. D 1
Max. Min. Basic Max.
Min.
Max.
Min.
Basic Max.
Min.
Min.
Max. 0.03 0.03 0.03 0.03 0.03 0.03 0.06 0.06 0.06 0.09 0.09 0.09
No. 10 0.1900 0.199 0.178 0.2500 0.260 0.237 5 ∕ 16 0.3125 0.324 0.298 1 ∕ 4 3 ∕ 8 0.3750 0.388 0.360 7 ∕ 16 0.4375 0.452 0.421
0.281 0.271 0.323 0.309 0.438 0.425 0.505 0.484 0.500 0.484 0.577 0.552 0.562 0.544 0.650 0.620 0.625 0.603 0.722 0.687 0.750 0.725 0.866 0.826 0.938 0.906 1.083 1.033 1.125 1.088 1.299 1.240 1.312 1.269 1.516 1.447 1.500 1.450 1.732 1.653 1.688 1.631 1.949 1.859 1.875 1.812 2.165 2.066
0.140 0.110 0.094 0.188 0.150 0.094 0.235 0.195 0.125 0.268 0.226 0.125 0.316 0.272 0.156 0.364 0.302 0.156 0.444 0.378 0.312 0.524 0.455 0.375 0.604 0.531 0.375 0.700 0.591 0.625 0.780 0.658 0.625 0.876 0.749 0.625
11 10
0.039 0.043 0.048 0.062 0.062 0.072 0.086 0.096 0.108 0.123 0.133 0.133
0.035 0.039 0.043 0.055 0.055 0.064 0.077 0.085 0.096 0.110 0.119 0.119
0.120 0.173 0.227 0.265 0.328 0.371 0.471 0.579 0.683 0.780 0.887 1.012
9 ∕ 32
1 ∕ 8
3 ∕ 8 1 ∕ 2
11 ∕ 64
9 7 7 6 5
7 ∕ 32
9 ∕ 16
1 ∕ 4
5 ∕ 8 3 ∕ 4
19 ∕ 64 11 ∕ 32 27 ∕ 64
0.5000 0.515 0.482 0.6250 0.642 0.605
1 ∕ 2 5 ∕ 8 3 ∕ 4 7 ∕ 8
15 ∕ 16
0.7500 0.768 0.729 1 1 ∕ 8 0.8750 0.895 0.852 1 5 ∕ 16
4 1 ∕ 2
1 ∕ 2
4
37 ∕ 64 43 ∕ 64
1 1.0000 1.022 0.976 1 1 ∕ 2 1 1 ∕ 8 1.1250 1.149 1.098 1 11 ∕ 16 1 1 ∕ 4 1.2500 1.277 1.223 1 7 ∕ 8
3 1 ∕ 2 3 1 ∕ 4 3 1 ∕ 4
3 ∕ 4
27 ∕ 32
a When specifying decimal nominal size, zeros before decimal point and in fourth decimal place are omitted. All dimensions in inches. Minimum thread length is 1 ∕ as close to the head as practicable. Thread formulas: Pitch = 1 ÷ thds. per inch. Flat at root = 0.4305 × pitch. Depth of single thread = 0.385 × pitch.
2 length of screw plus 0.50 inch, or 6.00 inches, whichever is shorter. Screws too short for the formula thread length shall be threaded
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