Hex Head Bolts Hot Dip Galvinized

HEX CAP SCREWS ASME B18.2.1-1996 |
Nominal
or
Basic
Product
Diameter
|
E |
F |
G |
H |
J |
Lt |
Y |
Body Diameter |
Width Across Flats |
Width
Across
Corners |
Head Height |
Wrn.
Hgt. |
Thread
Length |
|
For
Scw
Lgt.
<6in. |
For
Scw
Lgt.
>6in. |
Max |
Min |
Basic |
Max |
Min |
Max |
Min |
Basic |
Max |
Min |
Min |
Ref |
Ref |
Max |
1/4 |
0.2500 |
0.260 |
0.237 |
7/16 |
0.438 |
0.425 |
0.505 |
0.484 |
11/64 |
0.188 |
0.150 |
0.03 |
0.01 |
0.750 |
1.000 |
5/16 |
0.3125 |
0.324 |
0.298 |
1/2 |
0.500 |
0.484 |
0.577 |
0.552 |
7/32 |
0.235 |
0.195 |
0.03 |
0.01 |
0.875 |
1.125 |
3/8 |
0.3750 |
0.388 |
0.360 |
9/16 |
0.562 |
0.544 |
0.650 |
0.620 |
1/4 |
0.268 |
0.226 |
0.03 |
0.01 |
1.000 |
1.250 |
1/2 |
0.5000 |
0.515 |
0.482 |
3/4 |
0.750 |
0.725 |
0.866 |
0.826 |
11/32 |
0.364 |
0.302 |
0.03 |
0.01 |
1.250 |
1.500 |
5/8 |
0.6250 |
0.642 |
0.605 |
15/16 |
0.938 |
0.906 |
1.083 |
1.033 |
27/64 |
0.444 |
0.378 |
0.06 |
0.02 |
1.500 |
1.750 |
3/4 |
0.7500 |
0.768 |
0.729 |
1-1/8 |
1.125 |
1.088 |
1.299 |
1.240 |
1/2 |
0.524 |
0.455 |
0.06 |
0.02 |
1.750 |
2.000 |
7/8 |
0.8750 |
0.895 |
0.852 |
1-5/16 |
1.312 |
1.269 |
1.516 |
1.447 |
37/64 |
0.604 |
0.531 |
0.06 |
0.02 |
2.000 |
2.250 |
1" |
1.0000 |
1.022 |
0.976 |
1-1/2 |
1.500 |
1.450 |
1.732 |
1.653 |
43/64 |
0.700 |
0.591 |
0.09 |
0.03 |
2.250 |
2.500 |
|
Tolerance on Length |
Nominal
Screw Size |
Nominal Screw Length |
Up to 1 in.,
incl. |
Over 1 in.
to
2-1/2 in., incl.
|
Over 2-1/2 in.
to 4 in., incl. |
Over 4 in. to
6 in., incl. |
|
1/4 to 3/8 |
-0.03 |
-0.04 |
-0.06 |
-0.10 |
-0.18 |
7/16 and 1/2 |
-0.03 |
-0.06 |
-0.08 |
-0.10 |
-0.18 |
9/16 to 3/4 |
-0.03 |
-0.08 |
-0.10 |
-0.10 |
-0.18 |
7/8 and 1 |
.... |
-0.10 |
-0.14 |
-0.16 |
-0.20 |
|
.... |
-0.12 |
-0.16 |
-0.18 |
-0.22 |
‡Length of a cap screw is measured from the underhead bearing surface to the extreme end of the screw.

*These properties are tested only on machined specimens when the testing machine cannot provide for full testing of the parts.
**Product standards require the manufacturer’s head marking to appear on the top of all cap screws 1/4” diameter and larger. “X” represents one location such a marking may appear.
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