Hex Head Bolts; Grade 5 / Grade 8
| 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 |
0.2500 |
0.2450 |
7/16 |
0.438 |
0.428 |
0.505 |
0.488 |
5/32 |
0.163 |
0.150 |
0.106 |
0.750 |
1.000 |
0.250 |
5/16 |
0.3125 |
0.3125 |
0.3065 |
1/2 |
0.500 |
0.489 |
0.577 |
0.557 |
13/64 |
0.211 |
.0195 |
0.140 |
0.875 |
1.125 |
0.278 |
3/8 |
0.3750 |
0.3750 |
0.3690 |
9/16 |
0.562 |
0.551 |
0.650 |
0.628 |
15/64 |
0.243 |
0.226 |
0.160 |
1.000 |
1.250 |
0.312 |
7/16 |
0.4375 |
0.4375 |
0.4305 |
5/8 |
0.625 |
0.612 |
0.722 |
0.698 |
9/32 |
0.291 |
0.272 |
0.195 |
1.125 |
1.375 |
0.357 |
1/2 |
0.5000 |
0.5000 |
0.4930 |
3/4 |
0.750 |
0.736 |
0.866 |
0.840 |
5/16 |
0.323 |
0.302 |
0.215 |
1.250 |
1.500 |
0.385 |
9/16 |
0.5625 |
0.5625 |
0.5545 |
13/16 |
0.812 |
0.798 |
0.938 |
0.910 |
23/64 |
0.371 |
0.348 |
0.250 |
1.375 |
1.625 |
0.417 |
5/8 |
0.6250 |
0.6250 |
0.6170 |
15/16 |
0.938 |
0.922 |
1.083 |
1.051 |
25/64 |
0.403 |
0.378 |
0.269 |
1.500 |
1.750 |
0.455 |
3/4 |
0.7500 |
0.7500 |
0.7410 |
1-1/8 |
1.125 |
1.100 |
1.299 |
1.254 |
15/32 |
0.483 |
0.455 |
0.324 |
1.750 |
2.000 |
0.500 |
7/8 |
0.8750 |
0.8750 |
0.8660 |
1-5/16 |
1.312 |
1.285 |
1.516 |
1.465 |
35/64 |
0.563 |
0.531 |
0.378 |
2.000 |
2.250 |
0.556 |
1" |
1.0000 |
1.0000 |
1.0000 |
1-1/2 |
1.500 |
1.469 |
1.732 |
1.675 |
39/64 |
0.627 |
0.591 |
0.416 |
2.250 |
2.500 |
0.625 |
1-1/8 |
1.1250 |
1.1250 |
1.1140 |
1-11/16 |
1.688 |
1.631 |
1.949 |
1.859 |
11/16 |
0.718 |
0.658 |
0.461 |
2.500 |
2.750 |
0.714 |
1-1/4 |
1.2500 |
1.2500 |
1.2390 |
1-7/8 |
1.875 |
1.812 |
2.165 |
2.066 |
25/32 |
0.813 |
0.749 |
0.530 |
2.750 |
3.000 |
0.714 |
1-1/2 |
1.5000 |
1.5000 |
1.4880 |
2-1/4 |
2.250 |
2.175 |
2.598 |
2.480 |
1-5/16 |
0.974 |
0.902 |
0.640 |
3.250 |
3.500 |
0.833 |
| |
| 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.
D = Nominal diameter of the screw in inches
*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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