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Heavy Hex Bolts
ASTM A307
Grades A and B

ASTM A307 Grades A and B Mechanicals & Performance Data
A307 Heavy Hex Bolts image
Heavy Hex Bolts, A307    ASME 18.2.1  1996
Nominal or
Basic Product
Diameter
E F G H R LT
Body
Diameter
Width Across Flats Width
Across
Corners
Head Height Radius
of
Fillet
Thread
Lengths
6 in. and
Shorter
over
6 inch
Max Min Basic Max Min Max Min Basic Max Min Max Min Basic Basic
1/2 .500 .515 .482 7/8 .875 .850 1.010 .969 11/32 .364 .302 .03 .01 1.250 1.500
5/8 .625 .642 .605 1-1/16 1.062 1.031 1.227 1.175 27/64 .444 .378 .06 .02 1.500 1.750
3/4 .750 .768 .729 1-1/4 1.250 1.212 1.443 1.383 1/2 .524 .455 .06 .02 1.750 2.000
7/8 .875 .895 .852 1-7/16 1.438 1.394 1.660 1.589 37/64 .604 .531 .06 .02 2.000 2.250
1 1.000 1.022 .976 1-5/8 1.625 1.575 1.876 1.796 43/64 .700 .591 .09 .03 2.250 2.500
1-1/8 1.125 1.149 1.089 1-13/16 1.812 1.756 2.093 2.002 3/4 .780 .658 .09 .03 2.500 2.750
1-1/4 1.250 1.277 1.223 2 2.000 1.938 2.309 2.209 27/32 .876 .749 .09 .03 2.750 3.000
1-3/8 1.375 1.404 1.345 2-3/16 2.188 2.119 2.526 2.416 29/32 .940 .810 .09 .03 3.000 3.250
1-1/2 1.500 1.531 1.470 2-3/8 2.375 2.300 2.742 2.622 1 1.036 .902 .09 .03 3.250 3.500
1-3/4 1.750 1.785 1.716 2-3/4 2.750 2.662 3.175 3.035 1-5/32 1.196 1.054 .12 .04 3.750 4.000
2 2.000 2.039 1.964 3-1/8 3.125 3.025 3.608 3.449 1-11/32 1.388 1.175 .12 .04 4.250 4.500
2-1/4 2.250 2.305 2.214 3-1/2 3.500 3.388 4.041 3.862 1-1/2 1.548 1.327 .19 .06 4.750 5.000
2-1/2 2.500 2.559 2.461 3-7/8 3.875 3.750 4.474 4.275 1-21/32 1.708 1.479 .19 .06 5.250 5.500
2-3/4 2.750 2.827 2.711 4-1/4 4.250 4.112 4.907 4.688 1-13/16 1.869 1.632 .19 .06 5.75 6.000
3 3.000 3.081 2.961 4-5/8 4.625 4.475 5.340 5.102 2 2.060 1.815 .19 .06 6.250 6.500

Tolerance
on
Length
Nominal
Screw Size
Nominal Screw Length
Up to 1 inch
Included
Over 1 inch to
2-1/2 inch, Incl.
Over 2-1/2 inch
to 4 inch, Incl.
Over 4 in. to
6 in., Incl.
Longer than
6 inch
1/4 to 3/8 +.02 -.03 +.02 -.04 +.04 -.06 +.06 -.10 +.10 -.18
7/16 to 1/2 +.02 -.03 +.04 -.06 +.06 -.08 +.08 -.10 +.12 -.18
9/16 to 3/4 +.02 -.03 +.06 -.08 +.08 -.10 +.10 -.10 +.14 -.18
7/8 to 1 - - +.08 -.10 +.10 -.14 +.12 -.16 +.16 -.20
1-1/8 to 1-1/2 - - +.12 -.12 +.16 -.16 +.18 -.15 +.22 -.22
Over 1-1/2 - - +.18 -.18 +.20 -.20 +.22 -.22 +.24 -.24


Mechanical & Performance Data
ASTM A307 Heavy Hex Bolts

Description A low carbon steel hex bolt with a wider head than a standard hex bolt.
Applications
and
Advantages
Offers a greater wrenching area than standard hex machine bolts for use in heavy dutu industrial work.
Material Bolts shall be made from a carbon steel which conforms to the following chemical composition requirements - Grade A:  Phosphorus: .06% maximum  Sulfur: .15% maximum 
Grade B:  Phosphorus: .04% maximum  Sulfer: .05% maximum
Hardness Less than 3 times diameter in length:
Grade-A Rockwell B69-100.  Grade-B Rockwell B69-95.
Greater than 3 times diameter and longer in length:
Grade-A Rockwell B100 maximum.  Grade-B Rockwell B69-95.
Tensile
Strength
Grade-A 60,000 psi minimum
Grade-B 60.000 to 100,000 psi
Elongation
in 2 in.
18% minimum
Plating See plating page for plating information
Note: Product standards require the manufacturer's head marking to appear on the top of all cap screws 1/4 inch diameter and larger. The X on the head image above represents a location that such marking may appear.
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See also
Grades 5 & 8 Hex Cap Screws  and  Grade-2 and Stainless Hex Cap Screws
Structural Bolts  and  Heavy Hex Cap Screws

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Smith Fastener Company, A California Corporation - 3613 East Florence Avenue, Bell, California, 90201 - Phone: ( 323 ) 587-0382 - FAX: ( 323 ) 587-8712 - E-mail: sales@smithfast.com - Copyright © 2000 by Smith Fastener Company - Last updated: May 22nd, 2006 - http://www.smithfast.com/heavyhexboltA307.html