Machinery's Handbook, 31st Edition
Nuts 1681 Low and High Crown (Blind, Acorn) Nuts SAE Recommended Practice J483a F H T U Q S
S
R
A
G
.031 R
Low Crown
Width Across Flats, F
Width Across Corners, G
Drill Dep., T
Full Thd., U
Nom. Size a or Basic Major Dia. of Thread
Body Dia., A
Nose Radius, R
Body Radius, S
Max. (Basic) Min. Max. Min.
Max.
Min.
5 ∕ 16 0.3125 0.302 0.361 0.344 0.30 0.34 0.16 0.08 0.17 0.25 0.16 5 ∕ 16 0.3125 0.302 0.361 0.344 0.30 0.34 0.16 0.08 0.17 0.25 0.16 3 ∕ 8 0.3750 0.362 0.433 0.413 0.36 0.41 0.19 0.09 0.22 0.28 0.19 3 ∕ 8 0.3750 0.362 0.433 0.413 0.36 0.41 0.19 0.09 0.22 0.31 0.22 7 ∕ 16 0.4375 0.428 0.505 0.488 0.41 0.47 0.22 0.11 0.25 0.34 0.25 1 ∕ 2 0.5000 0.489 0.577 0.557 0.47 0.53 0.25 0.12 0.28 0.41 0.31 9 ∕ 16 0.5625 0.551 0.650 0.628 0.53 0.62 0.28 0.14 0.33 0.45 0.38 5 ∕ 8 0.6250 0.612 0.722 0.698 0.59 0.69 0.31 0.16 0.36 0.52 0.44 3 ∕ 4 0.7500 0.736 0.866 0.840 0.72 0.81 0.38 0.19 0.42 0.59 0.50 7 ∕ 8 0.8750 0.861 1.010 0.982 0.84 0.94 0.44 0.22 0.50 0.69 0.56 15 ∕ 16 0.9375 0.922 1.083 1.051 0.91 1.00 0.47 0.23 0.53 0.75 0.62
6 8
0.1380 0.1640 0.1900 0.2160 0.2500 0.3125 0.3750 0.4375 0.5000 0.5625 0.6250
10 12
1 ∕ 4
5 ∕ 16
3 ∕ 8
7 ∕ 16
1 ∕ 2
9 ∕ 16
5 ∕ 8 3 ∕ 4 7 ∕ 8
0.7500 1 1 ∕ 16 0.8750 1 1 ∕ 4 1.0000 1 7 ∕ 16 1.1250 1 5 ∕ 8 1.2500 1 13 ∕ 16
1.0625 1.045 1.227 1.191 1.03 1.16 0.53 0.27 0.59 0.88 0.75 1.2500 1.231 1.443 1.403 1.22 1.36 0.62 0.31 0.70 1.00 0.88 1.4375 1.417 1.660 1.615 1.41 1.55 0.72 0.36 0.81 1.12 1.00 1.6250 1.602 1.876 1.826 1.59 1.75 0.81 0.41 0.92 1.31 1.12 1.8125 1.788 2.093 2.038 1.78 1.95 0.91 0.45 1.03 1.44 1.25 High Crown
1
1 1 ∕ 8 1 1 ∕ 4
Width Across Flats, F
Width Across Corners, G
Drill Dep., T
Full Thd., U
Nom. Size a or Basic Major Dia. of Thread
Body Dia., A
Nose Radius, R
Body Radius, S
Max. (Basic) Min. Max. Min.
Max.
Min.
5 ∕ 16 0.3125 0.302 0.361 0.344 0.30 0.42 0.17 0.05 0.25 0.28 0.19 5 ∕ 16 0.3125 0.302 0.361 0.344 0.30 0.42 0.17 0.05 0.25 0.28 0.19 3 ∕ 8 0.3750 0.362 0.433 0.413 0.36 0.52 0.20 0.06 0.30 0.34 0.25 3 ∕ 8 0.3750 0.362 0.433 0.413 0.36 0.52 0.20 0.06 0.30 0.38 0.28 7 ∕ 16 0.4375 0.428 0.505 0.488 0.41 0.59 0.23 0.06 0.34 0.41 0.31 1 ∕ 2 0.5000 0.489 0.577 0.557 0.47 0.69 0.28 0.08 0.41 0.47 0.38 9 ∕ 16 0.5625 0.551 0.650 0.628 0.53 0.78 0.31 0.09 0.44 0.56 0.47 5 ∕ 8 0.6250 0.612 0.722 0.698 0.59 0.88 0.34 0.09 0.50 0.62 0.53 3 ∕ 4 0.7500 0.736 0.866 0.840 0.72 1.03 0.42 0.12 0.59 0.75 0.62 7 ∕ 8 0.8750 0.861 1.010 0.982 0.84 1.19 0.48 0.16 0.69 0.81 0.69 15 ∕ 16 0.9375 0.922 1.083 1.051 0.91 1.28 0.53 0.16 0.75 0.91 0.78
6 8
0.1380 0.1640 0.1900 0.2160 0.2500 0.3125 0.3750 0.4375 0.5000 0.5625 0.6250
10 12
1 ∕ 4
5 ∕ 16
3 ∕ 8
7 ∕ 16
1 ∕ 2
9 ∕ 16
5 ∕ 8 3 ∕ 4 7 ∕ 8
0.7500 1 1 ∕ 16 0.8750 1 1 ∕ 4 1.0000 1 7 ∕ 16 1.1250 1 5 ∕ 8
1.0625 1.045 1.227 1.191 1.03 1.45 0.59 0.17 0.84 1.06 0.94 1.12500 1.231 1.443 1.403 1.22 1.72 0.70 0.20 0.98 1.22 1.09 1.4375 1.417 1.660 1.615 1.41 1.97 0.81 0.23 1.14 1.38 1.25 1.6250 1.602 1.876 1.826 1.59 2.22 0.92 0.27 1.28 1.59 1.41
1
1 1 ∕ 8 1 1 ∕ 4
1.2500 1 13 ∕ 16 1.8125 1.788 2.093 2.038 1.78 2.47 1.03 0.28 1.44 1.75 1.56 a When specifying a nominal size in decimals, any zero in the fourth decimal place is omitted. Re- printed with permission. Copyright © 1990, Society of Automotive Engineers, Inc. All rights reserved. All dimensions are in inches. Threads are Unified Standard Class 2B, UNC or UNF Series.
Copyright 2020, Industrial Press, Inc.
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