ASME B18.5 Countersunk Bolts and Slotted Countersunk Bolts



Dimensions of Countersunk Bolts and Slotted Countersunk Bolts (Inch) 
 
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)]
Max.
Min.
Max. Edge Sharp[Note(2)] 
Min. Edge Sharp[Note(2)]
Absolute Min. Edge Rounded or Flat
Max.
Min.
Max.
Min.
Max.
Min.
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
1.022
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 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.

Tags: ASME B18.5 Slotted Countersunk Bolts Countersunk Bolts

General Material:Stainless Steel,Nickel Alloy,Silicon Bronze,Aluminium Bronze,Brass,Naval Brass,Coppe,Copper-Nickel,Aluminum Alloy,Titanium,Alloy Steel,Such as C1008,C1018,C1022,C1035,C1045,40cr,SCM435,35crmoA,42crmoA,AISI4140SS304/A2-70,SS316/A4-80,SS310s,SS309,SS321,SS410,SS317,SS904L,17-4 PH/630,Duplex 2205,Duplex 31803,Nitronic 40,Nitronic 50,Nitronic 60,Nickel Alloy,Hastelloy C276,Inconel 600,Inconel 601,Inconel 625,Inconel 718,Inconel X750,Inconel 800H,Inconel 825,Monel 400,Monel 405,Monel K-500,MP35N,Nickel 200,Nickel 201,Waspaloy)C65500,C64200,C61400,C63000,C63200,C46200,H59,H62,H67,C46400,C11000,90/10 C70600,70/30 C71500,6061-T6,2024-T4,Ti-6Al-4V Grade 5,ASTM B348 Grade 2,ASTM B348 Grade 7,651/S63198
General Surface Finish:Blackoxide,Zinc,Dacromet 500/Dacromet 320,Non-electrolytically Deposited Zinc Flake,Hot-dip Galvanization,Phosphating,Passviation