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ASME B18.5 Countersunk Bolts and Slotted Countersunk Bolts
Dimensions of Countersunk Bolts and Slotted Countersunk Bolts (Inch) |
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Nominal Size or Basic Bolt Diameter [Note (1)] |
Body Diameter, E |
Head Diameter, A |
Maximum Flat on Min. Dia. Head, F [Note (4)] |
Head Height, H |
Slot Width,J [Note(5)] |
Slot Width,J [Note(5)] |
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Max. |
Min. |
Max. Edge Sharp[Note(2)] |
Min. Edge Sharp[Note(2)] |
Absolute Min. Edge Rounded or Flat |
Max. |
Min. |
Max. |
Min. |
Max. |
Min. |
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1/4 |
0.25 |
0.26 |
0.237 |
0.493 |
0.477 |
0.445 |
0.018 |
0.15 |
0.131 |
0.075 |
0.064 |
0.068 |
0.045 |
5/16 |
0.3125 |
0.324 |
0.298 |
0.618 |
0.598 |
0.558 |
0.023 |
0.189 |
0.164 |
0.084 |
0.072 |
0.086 |
0.057 |
3/8 |
0.375 |
0.388 |
0.36 |
0.74 |
0.715 |
0.668 |
0.027 |
0.225 |
0.196 |
0.094 |
0.081 |
0.103 |
0.068 |
7/16 |
0.4375 |
0.452 |
0.421 |
0.803 |
0.778 |
0.726 |
0.03 |
0.226 |
0.196 |
0.094 |
0.081 |
0.103 |
0.068 |
1/2 |
0.5 |
0.515 |
0.483 |
0.935 |
0.905 |
0.845 |
0.035 |
0.269 |
0.233 |
0.106 |
0.091 |
0.103 |
0.068 |
5/8 |
0.625 |
0.642 |
0.605 |
1.169 |
1.132 |
1.066 |
0.038 |
0.336 |
0.292 |
0.133 |
0.116 |
0.137 |
0.091 |
3/4 |
0.75 |
0.768 |
0.729 |
1.402 |
1.357 |
1.285 |
0.041 |
0.403 |
0.349 |
0.149 |
0.131 |
0.171 |
0.115 |
7/8 |
0.875 |
0.895 |
0.852 |
1.637 |
1.584 |
1.511 |
0.042 |
0.47 |
0.408 |
0.167 |
0.147 |
0.206 |
0.138 |
1 |
1 |
1.022 |
0.976 |
1.869 |
1.81 |
1.735 |
0.043 |
0.537 |
0.466 |
0.188 |
0.166 |
0.24 |
0.162 |
11/8 |
1.125 |
1.149 |
1.098 |
2.104 |
2.037 |
1.962 |
0.043 |
0.604 |
0.525 |
0.196 |
0.178 |
0.257 |
0.173 |
11/4 |
1.25 |
1.277 |
1.223 |
2.337 |
2.262 |
2.187 |
0.043 |
0.671 |
0.582 |
0.211 |
0.193 |
0.291 |
0.197 |
13/8 |
1.375 |
1.404 |
1.345 |
2.571 |
2.489 |
2.414 |
0.043 |
0.738 |
0.641 |
0.226 |
0.208 |
0.326 |
0.22 |
11/2 |
1.5 |
1.531 |
1.47 |
2.804 |
2.715 |
2.64 |
0.043 |
0.805 |
0.698 |
0.258 |
0.24 |
0.36 |
0.244 |
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 four th 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.
NOTES:
(1) Where specifying nominal size in decimals, zeros preceding decimal and in the four th 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.
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