Machinery's Handbook, 31st Edition
1932
WING NUTS, WING SCREWS AND THUMB SCREWS
Examples: 10–32 × 1 1 ∕
4 , Thumb Screw, Type A, Regular, Steel, Zinc Plated. 0.375–16 × 2.00, Wing Screw, Type B, Style 2, Steel, Cadmium Plated. 0.250–20 × 1.50, Wing Screw, Type C, Style 2, Zinc Alloy Wings, Steel Shank, Brass Plated. Table 7. American National Standard Types A and B Thumb Screws ANSI/ASME B18.17-1968 (Withdrawn)
B L E
B L E
B
L
B L
A
A
A
A
see note 1
see note 1
see note 1
see note 1
C
C
C
C ”
C ”
Regular
Heavy
C
Regular
Heavy
C
TYPE A
TYPE B
C ′
A
B
C
E
L
Head Width Practical Screw Lengths Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Type A, Regular Head Height Head Thick. Head Thick. Shoulder Diameter
Nominal Size or Basic Screw Diameter a 6 (0.1380) 8 (0.1640) 10 (0.1900) 12 (0.2160) 1 ∕ 4 (0.2500) 5 ∕ 16 (0.3125) 3 ∕ 8 (0.3750) 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) 7 ∕ 16 (0.4375) 1 ∕ 2 (0.5000) 10 (0.1900) 1 ∕ 4 (0.2500) 5 ∕ 16 (0.3125) 3 ∕ 8 (0.3750) 7 ∕ 16 (0.4375) 1 ∕ 2 (0.5000)
Thds. per Inch
32 0.31 0.29 0.33 0.31 0.05 0.04 … … 0.25 0.23 0.75 0.25 32 0.36 0.34 0.38 0.36 0.06 0.05 … … 0.31 0.29 0.75 0.38 24, 32 0.42 0.40 0.48 0.46 0.06 0.05 … … 0.35 0.32 1.00 0.38 24 0.48 0.46 0.54 0.52 0.06 0.05 … … 0.40 0.38 1.00 0.38 20 0.55 0.52 0.64 0.61 0.07 0.05 … … 0.47 0.44 1.50 0.50 18 0.70 0.67 0.78 0.75 0.09 0.07 … … 0.59 0.56 1.50 0.50 16 0.83 0.80 0.95 0.92 0.11 0.09 … … 0.76 0.71 2.00 0.75 Type A, Heavy 24 0.89 0.83 0.84 0.72 0.18 0.16 0.10 0.08 0.33 0.31 2.00 0.50 20 1.05 0.99 0.94 0.81 0.24 0.22 0.10 0.08 0.40 0.38 3.00 0.50 18 1.21 1.15 1.00 0.88 0.27 0.25 0.11 0.09 0.46 0.44 4.00 0.50 16 1.41 1.34 1.16 1.03 0.30 0.28 0.11 0.09 0.55 0.53 4.00 0.50 14 1.59 1.53 1.22 1.09 0.36 0.34 0.13 0.11 0.71 0.69 2.50 1.00 13 1.81 1.72 1.28 1.16 0.40 0.38 0.14 0.12 0.83 0.81 3.00 1.00 Type B, Regular 32 0.45 0.43 0.28 0.26 0.08 0.06 0.03 0.02 … … 1.00 0.25 32 0.51 0.49 0.32 0.30 0.09 0.07 0.04 0.02 … … 1.00 0.38 24, 32 0.58 0.54 0.39 0.36 0.10 0.08 0.05 0.03 … … 2.00 0.38 24 0.71 0.67 0.45 0.43 0.11 0.09 0.05 0.03 … … 2.00 0.38 20 0.83 0.80 0.52 0.48 0.16 0.14 0.06 0.03 … … 2.50 0.50 18 0.96 0.91 0.64 0.60 0.17 0.14 0.09 0.06 … … 3.00 0.50 16 1.09 1.03 0.71 0.67 0.22 0.18 0.11 0.08 … … 3.00 0.75 14 1.40 1.35 0.96 0.91 0.27 0.24 0.14 0.11 … … 4.00 1.00 13 1.54 1.46 1.09 1.03 0.33 0.29 0.15 0.11 … … 4.00 1.00 Type B, Heavy 24 0.89 0.83 0.78 0.66 0.18 0.16 0.08 0.06 … … 2.00 0.50 20 1.05 0.99 0.81 0.72 0.24 0.22 0.11 0.09 … … 3.00 0.50 18 1.21 1.15 0.88 0.78 0.27 0.25 0.11 0.09 … … 4.00 0.50 16 1.41 1.34 0.94 0.84 0.30 0.28 0.14 0.12 … … 4.00 0.50 14 1.59 1.53 1.00 0.91 0.36 0.34 0.14 0.12 … … 3.00 1.00
13 1.81 1.72 1.09 0.97 0.40 0.38 0.18 0.16 … … 3.00 1.00 a Where specifying nominal size in decimals, zeroes in fourth decimal place are omitted. All dimensions in inches. 1 Plain point, unless alternate point from styles shown in Table 8 is specified by user. Lengths of Wing and Thumb Screws.— The length of wing or thumb screws is measured parallel to the axis of the screw from the intersection of the head or shoulder with the shank to the extreme point of the screw. Standard length increments are as follows: For
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