Machinery's Handbook, 31st Edition
WING NUTS, WING SCREWS AND THUMB SCREWS Table 6. American National Standard Types C and D Wing Screws ANSI/ASME B18.17-1968 (Withdrawn)
1931
B
L see note 1
B
L
E
F
C
C
G
G
E
A
A
see note 1
Shank permanently inserted into wing portion
Style 1
Style 2
TYPE C
B
L
E C
G
see note 1
E
A
T
Shank welded to wing portion
TYPE D
A
B
C
E
F
G
L
Nominal Size or Basic Screw Diameter a 6 (0.1380) 8 (0.1640) 10 (0.1900) 1 ∕ 4 (0.2500) 5 ∕ 16 (0.3125) 3 ∕ 8 (0.3750) 6 (0.1380) 8 (0.1640) 10 (0.1900) 1 ∕ 4 (0.2500) 5 ∕ 16 (0.3125) 3 ∕ 8 (0.3750) 7 ∕ 16 (0.4375) 1 ∕ 2 (0.5000) 6 (0.1380) 8 (0.1640) 10 (0.1900) 12 (0.2160) 1 ∕ 4 (0.2500) 5 ∕ 16 (0.3125) 3 ∕ 8 (0.3750)
Wing Spread Practical Screw Lengths Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Type C, Style 1 Wing Height Wing Thick. Boss Dia. Boss Dia. Height
Thds. per Inch
32 0.85 0.83 0.45 0.43 0.15 0.12 … … 0.41 0.39 0.12 0.07 0.75 0.25 32 0.85 0.83 0.45 0.43 0.15 0.12 … … 0.41 0.39 0.12 0.07 1.00 0.38 24, 32 0.85 0.83 0.45 0.43 0.15 0.12 … … 0.41 0.39 0.12 0.07 1.25 0.38 20 1.08 1.05 0.56 0.53 0.17 0.14 … … 0.46 0.44 0.12 0.07 1.50 0.50 18 1.23 1.20 0.64 0.62 0.22 0.19 … … 0.51 0.49 0.14 0.10 1.50 0.50 16 1.45 1.42 0.74 0.72 0.24 0.21 … … 0.63 0.62 0.15 0.12 1.50 0.50 Type C, Style 2 32 0.85 0.83 0.43 0.42 0.14 0.12 0.38 0.36 0.41 0.40 0.20 0.18 1.00 0.25 32 0.85 0.83 0.43 0.42 0.14 0.12 0.38 0.36 0.41 0.40 0.20 0.18 1.00 0.38 24, 32 0.85 0.83 0.43 0.42 0.14 0.12 0.38 0.36 0.41 0.40 0.20 0.18 2.00 0.38 20 1.08 1.05 0.57 0.53 0.16 0.14 0.44 0.42 0.48 0.46 0.23 0.21 2.50 0.50 18 1.23 1.20 0.64 0.62 0.20 0.18 0.50 0.49 0.57 0.55 0.26 0.24 3.00 0.50 16 1.45 1.42 0.74 0.72 0.23 0.21 0.62 0.60 0.69 0.67 0.29 0.27 3.00 0.75 14 1.89 1.86 0.91 0.90 0.29 0.28 0.75 0.73 0.83 0.82 0.38 0.37 4.00 1.00 13 1.89 1.86 0.91 0.90 0.29 0.28 0.75 0.73 0.83 0.82 0.38 0.37 4.00 1.00 Type D 32 0.78 0.72 0.40 0.34 0.18 0.12 0.35 0.31 0.40 0.34 0.21 0.14 0.75 0.25 32 0.78 0.72 0.40 0.34 0.18 0.12 0.35 0.31 0.40 0.34 0.21 0.14 0.75 0.38 24 0.90 0.84 0.46 0.40 0.21 0.15 0.35 0.31 0.53 0.47 0.22 0.16 1.00 0.38 24 1.09 1.03 0.46 0.40 0.26 0.20 0.44 0.39 0.61 0.55 0.24 0.18 1.00 0.38 20 1.09 1.03 0.46 0.40 0.26 0.20 0.47 0.43 0.61 0.55 0.24 0.18 1.50 0.50 18 1.31 1.25 0.62 0.56 0.29 0.23 0.57 0.53 0.68 0.62 0.29 0.23 1.50 0.50 16 1.31 1.25 0.62 0.56 0.29 0.23 0.63 0.59 0.68 0.62 0.29 0.23 2.00 0.75
All dimensions in inches. 1 Plain point, unless alternate point from styles shown in Table 8 is specified by user. a Where specifying nominal size in decimals, zeros in the fourth decimal place are omitted. Wing Screw and Thumb Screw Designation.— When specifying wing and thumb screws, the following data should be included in the designation and should appear in the following sequence: nominal size (number, fraction or decimal equivalent), threads per inch, length (fractions or decimal equivalents), type, style and/or series, point (if other than plain point), materials, and finish.
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