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Specifications
Mil-Spec

 

Description:

A low or medium carbon steel, externally threaded mechanical device, 1/4 inch in diameter or larger, with a trimmed hex head and
a hot-dip galvanized coating. A hex bolt does not have a washer face on its bearing surface as does a hex cap screw, nor does it have a machined point. Its body tolerances are not as close as those of a cap screw.

 

Advantages:

Designed to be used in highly corrosive environments (ie. coastal locales and heavily polluted atmospheres). May be inserted into
an oversized hole and should be assembled with a nut.

 

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

Trans

-ition
Thd
Lgt.

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.

Longer

than 6 in.

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

1-1/8 to

1-1/2

....
-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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