Machinery's Handbook, 31st Edition
Bolts 1687 American National Standard Countersunk Bolts and Slotted Countersunk Bolts ANSI/ASME B18.5-2012 (R2017)
(Max) (Min)
H
Edge may be rounded or flat
H
T
H
82° 78°
E
J
F
Slotted Head
L
Head Diameter, A
Body Diameter, E
Nominal Size a or Basic Bolt Diameter
Flat on Min. Dia., Head, F b
Max. Edge Sharp 0.493 0.618 0.740 0.803 0.935 1.169 1.402 1.637 1.869 2.104 2.337 2.571 2.804 Max. 0.075 0.084 0.094 0.094 0.106 0.133 0.149 0.167 0.188 0.196 0.211 0.226 0.258
Min. Edge Sharp 0.477 0.598 0.715 0.778 0.905 1.132 1.357 1.584 1.810 2.037 2.262 2.489 2.715 0.064 0.072 0.081 0.081 0.091 0.116 0.131 0.147 0.166 0.178 0.193 0.208 0.240 Min.
Absolute Min. Edge Rounded or Flat
Max. 0.260 0.324 0.388 0.452 0.515 0.642 0.768 0.895 1.022 1.149 1.277 1.404 1.531 Max. c 0.150 0.189 0.225 0.226 0.269 0.336 0.403 0.470 0.537 0.604 0.671 0.738 0.805
Min. 0.237 0.298 0.360 0.421 0.483 0.605 0.729 0.852 0.976 1.098 1.223 1.345 1.470 Min. d 0.131 0.164 0.196 0.196 0.233 0.292 0.349 0.408 0.466 0.525 0.582 0.641 0.698
Max. 0.018 0.023 0.027 0.030 0.035 0.038 0.041 0.042 0.043 0.043 0.043 0.043 0.043 Min. 0.045 0.057 0.068 0.068 0.068 0.091 0.115 0.138 0.162 0.173 0.197 0.220
0.2500 0.3125 0.3750 0.4375 0.5000 0.6250 0.7500 0.8750 1.0000 1.1250 1.2500 1.3750 1.5000 0.2500 0.3125 0.3750 0.4375 0.5000 0.6250 0.7500 0.8750 1.0000 1.1250 1.2500 1.3750
0.445 0.558 0.668 0.726 0.845 1.066 1.285 1.511 1.735 1.962 2.187 2.414 2.640 Max. 0.068 0.086 0.103 0.103 0.103 0.137 0.171 0.206 0.240 0.257 0.291 0.326 0.360
1 ∕ 4
5 ∕ 16
3 ∕ 8
7 ∕ 16
1 ∕ 2 5 ∕ 8 3 ∕ 4 7 ∕ 8
1
1 1 ∕ 8 1 1 ∕ 4 1 3 ∕ 8 1 1 ∕ 2
Head Height, H
Slot Width, J
Slot Depth, T
Nom. Size or Basic Bolt Dia.
1 ∕ 4
5 ∕ 16
3 ∕ 8
7 ∕ 16
1 ∕ 2 5 ∕ 8 3 ∕ 4 7 ∕ 8
1
1 1 ∕ 8 1 1 ∕ 4 1 3 ∕ 8 1 1 ∕ 2
1.5000 0.244 a Where specifying size in decimals, zeros preceding decimal and in fourth decimal place omitted. b Flat on minimum diameter head calculated on minimum sharp and absolute minimum head diameters and 82 ° head angle. c Maximum head height calculated on maximum sharp head diameter, basic bolt diameter, and 78 ° head angle. d Minimum head height calculated on minimum sharp head diameter, basic bolt diameter, and 82 ° head angle. All dimensions are given in inches. For thread information and method of bolt designation see footnotes to previous table. Heads are unslotted unless otherwise specified. For slot dimensions see Table 1 in Slotted Head Cap Screws on page 1812. Wrench Clearance Dimensions.— Wrench openings for nuts are given in Table 1, clear ances for open end engineers wrenches in Table 2, clearances for single and double hexa gon socket wrenches in Table 3a (inch) and Table 3b (metric), clearances for 12-point box wrenches (inch and metric) are given in Table 4. They are based on the dimensions across the flats of the fastener.
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