Hexagon Machine Screw Nuts per. ANSI B18.6.3

Engineering ANSI Hardware Design Data
Engineering Metric Hardware Design Data

Threads: Except for sizes 0000, 000, and 00, machine screw threads may be either Unified Coarse (UNC) and Fine thread (UNF) Class 2A.

Square and Hexagon Machine Screw Nuts Size Table

Square and Hexagon Machine Screw Nuts Size Table ANSI B18.6.3

Nominal
Size
Basic
Diameter
Basic|
F
Max.
F
Min.
F
Max.
G
Min.
G
Max
G1
Min.
G1
Max.
H
Min.
H
0
1
2
3
4
5
6
8
10
12
1/4
5/16
3/8
0.0600
0.0730
0.0850
0.0990
0.1120
0.1250
0.1380
0.1640
0.1900
0.2160
0.2500
0.3125
0.3750
5/32
5/32
3/16
3/16
1/4
5/16
5/16
11/32
3/8
7/16
7/16
9/16
5/8
0.156
0.156
0.188
0.188
0.250
0.312
0.312
0.344
0.375
0.438
0.438
0.562
0.625
0.150
0.150
0.180
0.180
0.241
0.302
0.302
0.332
0.362
0.423
0.423
0.545
0.607
0.221
0.221
0.265
0.265
0.354
0.442
0.442
0.486
0.530
0.619
0.619
0.795
0.884
0.206
0.206
0.247
0.247
0.331
0.415
0.415
0.456
0.497
0.581
0.581
0.748
0.833
0.180
0.180
0.217
0.217
0.289
0.361
0.361
0.397
0.433
0.505
0.505
0.650
0.722
0.171
0.171
0.205
0.205
0.275
0.344
0.344
0.378
0.413
0.482
0.482
0.621
0.692
0.050
0.050
0.066
0.066
0.098
0.114
0.114
0.130
0.130
0.161
0.193
0.225
0.257
0.043
0.043
0.057
0.057
0.087
0.102
0.102
0.117
0.117
0.148
0.178
0.208
0.239

All dimensions in inches. Hexagon machine screw nuts have tops flat and chamfered. Diameter of top circle should be the maximum width across flats within a tolerance of minus 15 per cent. Bottoms are flat but may be chamfered if so specified. Square machine screw nuts have tops and bottoms flat without chamfer.

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