Table 5. American National Standard Square Lag Screws ANSI/ASME B18.2.1-2012
60° Approx
G
H
S
P 60°
Cone Point
T
B
E
60° Approx
D 1
F
R
Gimlet Point
25° Approx.
L
Detail of Thread
Body or Shoulder Dia. E
Width Across Flats F
Width Across Corners G
Shoulder Length S
Radius of Fillet R
Height H
Nominal Size a or Basic Product Dia.
Thread Dimensions
Thds. per Inch
Flat at Root B
Depth of Thd. T
Root Dia. D 1
Pitch P
Max.
Min.
Basic Max.
Min.
Max.
Min.
Basic Max.
Min.
Min. 0.094 0.094 0.125 0.125 0.156 0.156 0.312 0.375 0.375 0.625 0.625 0.625
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 0.260 0.237 0.324 0.298 0.388 0.360 0.452 0.421 0.515 0.482 0.642 0.605
0.281 0.271 0.398 0.372 0.375 0.362 0.530 0.498 0.500 0.484 0.707 0.665 0.562 0.544 0.795 0.747 0.625 0.603 0.884 0.828 0.750 0.725 1.061 0.995 0.938 0.906 1.326 1.244 1.125 1.088 1.591 1.494 1.312 1.269 1.856 1.742 1.500 1.450 2.121 1.991 1.688 1.631 2.386 2.239 1.875 1.812 2.652 2.489
0.140 0.110 0.188 0.156 0.220 0.186 0.268 0.232 0.316 0.278 0.348 0.308 0.444 0.400 0.524 0.476 0.620 0.568 0.684 0.628 0.780 0.720 0.876 0.812
11 10
0.091 0.039 0.035 0.120 0.100 0.043 0.039 0.173 0.111 0.048 0.043 0.227 0.143 0.062 0.055 0.265 0.143 0.062 0.055 0.328 0.167 0.072 0.064 0.371 0.200 0.086 0.077 0.471 0.222 0.096 0.085 0.579 0.250 0.108 0.096 0.683 0.286 0.123 0.110 0.780 0.308 0.133 0.119 0.887 0.308 0.133 0.119 1.012
9 ∕ 32
1 ∕ 8
0.2500 0.3125 0.3750 0.4375 0.5000 0.6250 0.7500 0.8750 1.0000 1.1250 1.2500
1 ∕ 4
3 ∕ 8 1 ∕ 2
11 ∕ 64 13 ∕ 64
9 7 7 6 5
5 ∕ 16
3 ∕ 8
9 ∕ 16
1 ∕ 4
7 ∕ 16
5 ∕ 8 3 ∕ 4
19 ∕ 64 21 ∕ 64 27 ∕ 64
1 ∕ 2 5 ∕ 8 3 ∕ 4 7 ∕ 8
15 ∕ 16
0.768 0.729 1 1 ∕ 8 0.895 0.852 1 5 ∕ 16 1.022 0.976 1 1 ∕ 2 1.149 1.098 1 11 ∕ 16 1.277 1.223 1 7 ∕ 8
4 1 ∕ 2
1 ∕ 2
4
19 ∕ 42 21 ∕ 32
1
3 1 ∕ 2 3 1 ∕ 4 3 1 ∕ 4
1 1 ∕ 8 1 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 ÷ threads 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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