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Dimensions of Countersunk Bolts and Slotted Countersunk Bolts (Inch)
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Nominal Size
or Basic Bolt Diameter [Note (1)] |
Body Diameter, E
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Head Diameter, A
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Maximum Flat on Min. Dia. Head, F [Note (4)]
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Head Height, H
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Slot Width,J
[Note(5)] |
Slot Width,J
[Note(5)] |
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Max.
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Min.
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Max. Edge Sharp[Note(2)]
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Min. Edge Sharp[Note(2)]
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Absolute Min. Edge Rounded or Flat
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Max.
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Min.
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Max.
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Min.
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Max.
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Min.
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1/4
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0.25
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0.26
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0.237
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0.493
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0.477
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0.445
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0.018
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0.15
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0.131
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0.075
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0.064
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0.068
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0.045
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5/16
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0.3125
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0.324
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0.298
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0.618
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0.598
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0.558
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0.023
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0.189
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0.164
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0.084
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0.072
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0.086
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0.057
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3/8
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0.375
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0.388
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0.36
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0.74
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0.715
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0.668
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0.027
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0.225
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0.196
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0.094
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0.081
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0.103
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0.068
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7/16
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0.4375
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0.452
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0.421
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0.803
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0.778
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0.726
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0.03
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0.226
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0.196
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0.094
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0.081
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0.103
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0.068
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1/2
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0.5
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0.515
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0.483
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0.935
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0.905
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0.845
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0.035
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0.269
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0.233
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0.106
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0.091
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0.103
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0.068
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5/8
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0.625
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0.642
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0.605
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1.169
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1.132
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1.066
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0.038
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0.336
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0.292
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0.133
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0.116
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0.137
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0.091
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3/4
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0.75
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0.768
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0.729
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1.402
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1.357
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1.285
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0.041
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0.403
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0.349
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0.149
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0.131
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0.171
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0.115
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7/8
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0.875
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0.895
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0.852
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1.637
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1.584
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1.511
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0.042
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0.47
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0.408
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0.167
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0.147
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0.206
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0.138
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1
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1
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1.022
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0.976
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1.869
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1.81
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1.735
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0.043
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0.537
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0.466
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0.188
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0.166
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0.24
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0.162
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11/8
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1.125
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1.149
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1.098
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2.104
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2.037
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1.962
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0.043
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0.604
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0.525
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0.196
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0.178
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0.257
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0.173
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11/4
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1.25
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1.277
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1.223
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2.337
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2.262
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2.187
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0.043
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0.671
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0.582
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0.211
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0.193
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0.291
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0.197
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13/8
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1.375
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1.404
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1.345
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2.571
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2.489
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2.414
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0.043
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0.738
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0.641
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0.226
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0.208
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0.326
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0.22
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11/2
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1.5
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1.531
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1.47
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2.804
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2.715
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2.64
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0.043
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0.805
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0.698
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0.258
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0.24
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0.36
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0.244
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GENERAL NOTE: For additional requirements, refer to section 2, General Data.
NOTES:
(1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
(2) Maximum head height calculated on maximum sharp head diameter, basic bolt diameter, and 78-deg head angle.
(3) Minimum head height calculated on minimum sharp head diameter, basic bolt diameter, and 82-deg head angle.
(4) Flat on minimum diameter head calculated on minimum sharp and absolute minimum head diameters and 82-deg head angle.
(5) Head shall be unslotted, unless other wise specified. Slot dimensions are same as slotted flat countersunk head cap screws in
American National Standard, ANSI B18.6.2.