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ASME B18.5 T-Head Bolts
Nominal Size
or Basic Bolt Diameter [Note (1)] |
Body Diameter, E
|
Head Diameter, A
|
Head Width, B
|
Head Height, H
|
Basic Head Radius,K
|
Maximum Fillet Radius,R[Note (2)]
|
|||||
Max.
|
Min.
|
Max.
|
Min.
|
Max.
|
Min.
|
Max.
|
Min.
|
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1/4
|
0.25
|
0.26
|
0.237
|
0.5
|
0.488
|
0.28
|
0.245
|
0.204
|
0.172
|
0.438
|
0.031
|
5/16
|
0.3125
|
0.324
|
0.298
|
0.625
|
0.609
|
0.342
|
0.307
|
0.267
|
0.233
|
0.5
|
0.031
|
3/8
|
0.375
|
0.388
|
0.36
|
0.75
|
0.731
|
0.405
|
0.368
|
0.331
|
0.295
|
0.625
|
0.031
|
7/16
|
0.4375
|
0.452
|
0.421
|
0.875
|
0.853
|
0.468
|
0.431
|
0.394
|
0.356
|
0.875
|
0.031
|
1/2
|
0.5
|
0.515
|
0.483
|
1
|
0.975
|
0.53
|
0.492
|
0.458
|
0.418
|
0.875
|
0.031
|
5/8
|
0.625
|
0.642
|
0.605
|
1.25
|
1.218
|
0.675
|
0.616
|
0.585
|
0.541
|
1.062
|
0.062
|
3/4
|
0.75
|
0.768
|
0.729
|
1.5
|
1.462
|
0.8
|
0.741
|
0.649
|
0.601
|
1.25
|
0.062
|
7/8
|
0.875
|
0.895
|
0.852
|
1.75
|
1.706
|
0.938
|
0.865
|
0.776
|
0.724
|
1.375
|
0.062
|
1
|
1
|
1.022
|
0.976
|
2
|
1.95
|
1.063
|
0.99
|
0.903
|
0.847
|
1.5
|
0.062
|
GENERAL NOTE: For additional requirements, refer to section 2, General Data.
NOTES:
(1) Where specif ying nominal size in decimals, zeros preceding decimal and in the four th decimal place shall be omitted.
(2) The minimum radius is one half of the value shown.
NOTES:
(1) Where specif ying nominal size in decimals, zeros preceding decimal and in the four th decimal place shall be omitted.
(2) The minimum radius is one half of the value shown.
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