Heavy Hex Bolts

Heavy Hex Bolts, A307 ASME 18.2.1 1996
Nominal or Basic Product Diameter		E		F			G		H			R		L_T
		Body Diameter		Width Across Flats			Width Across Corners		Head Height			Radius of Fillet		Thread Lengths
		Body Diameter		Width Across Flats			Width Across Corners		Head Height			Radius of Fillet		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

Nominal Screw Size	Nominal Screw Length
Nominal Screw Size	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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