A307 Hex Bolt, Galvanized

ASTM A307 Grade A hex bolts are common fasteners manufactured from low carbon steel. Dimensional specifications are governed by ASME B18.2.1. Grade marking consists of both the grade symbol "307A" and the manufacturer's identification mark. Inch series fasteners meeting ASTM A307 Grade A specifications are common/economical fasteners used for general applications. These bolts have a finished pattern head, whereas A307 Grade B bolts have a heavy pattern head. A307 hex bolts are available in hot dip galvanized finish, which provides a corrosion resistant zinc coating.

Technical Data

Governing StandardsA307

ASTM A307	Covers the mechanical and material requirements for inch series fasteners in diameters from 1/4″ through 4″, made of carbon steel having a minimum tensile strength of 60,000 psi.
ASME B18.2.1	Covers the complete general and dimensional data for multiple types of inch series square and hex bolts and screws.
ASME B1.1 UNC & UNF Class 2A	Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.

A307 Head Marking
A307 Material Marking

Mechanical PropertiesA307

Low Carbon Steel			Per ASTM A307-2014
Grade A	Diameter	Bolt or Stud Length	Tensile Strength	Elongation	Core Hardness (1)
			Min psi	Min %	Rockwell
	1/4 thru 4"	Less than 3 X dia (2)	60,000	18	B69 to B100
		3 X dia and longer	60,000	18	B100

1. As measured anywhere on the surface or through the cross section.
2. Also bolts with drilled or undersized heads. These sizes and bolts with modified heads shall meet the minimum and maximum hardness as hardness is the only requirement.

Chemical PropertiesA307

Per ASTM A307-2014
Grade A	Carbon	Manganese	Phosphorus	Sulfur
	% by heat analysis	% by heat analysis	% by heat analysis	% by heat analysis
	0.29	1.20	0.04	0.15

Dimensional SpecificationsA307

Per ASME B18.2.1-2012
Nominal Diameter		UNC	UNF	E		F			G		H			LT
				Body Diameter		Width Across Flats			Width Across Corners		Head Height			Thread Length
				Max	Min	Basic	Max	Min	Max	Min	Basic	Max	Min	Lengths up to 6"	Lengths > 6"
1/4	0.2500	20	28	0.2500	0.2405	7/16	0.4380	0.4280	0.5050	0.4880	5/32	0.1630	0.1500	0.7500	1.0000
5/16	0.3125	18	24	0.3125	0.3065	1/2	0.5000	0.4890	0.5770	0.5570	13/64	0.2110	0.1950	0.8750	1.1250
3/8	0.3750	16	24	0.3750	0.3690	9/16	0.5620	0.5510	0.6500	0.6280	15/64	0.2430	0.2260	1.0000	1.2500
7/16	0.4375	14	20	0.4375	0.4305	5/8	0.6250	0.6120	0.7220	0.6980	9/32	0.2910	0.2720	1.1250	1.3750
1/2	0.5000	13	20	0.5000	0.4930	3/4	0.7500	0.7360	0.8660	0.8400	5/16	0.3230	0.3020	1.2500	1.5000
9/16	0.5625	12	18	0.5625	0.5545	13/16	0.8120	0.7980	0.9380	0.9100	23/64	0.3710	0.3480	1.3750	1.6250
5/8	0.6250	11	18	0.6250	0.6170	15/16	0.9380	0.9220	1.0830	1.0510	25/64	0.4030	0.3780	1.5000	1.7500
3/4	0.7500	10	16	0.7500	0.7410	1 1/8	1.1250	1.1000	1.2990	1.2540	15/32	0.4830	0.4550	1.7500	2.0000
7/8	0.8750	9	14	0.8750	0.8660	1 5/16	1.3120	1.2850	1.5160	1.4650	35/64	0.5630	0.5310	2.0000	2.2500
1	1.0000	8	14	1.0000	0.9900	1 1/2	1.5000	1.4690	1.7320	1.6750	39/64	0.6270	0.5910	2.2500	2.5000
1 1/8	1.1250	7	12	1.1250	1.1140	1 11/16	1.6880	1.6310	1.9490	1.8590	11/16	0.7180	0.6580	2.5000	2.7500
1 1/4	1.2500	7	12	1.2500	1.2390	1 7/8	1.8750	1.8120	2.1650	2.0660	25/32	0.8130	0.7490	2.7500	3.0000
1 3/8	1.3750	6	12	1.3750	1.3630	2 1/16	2.0620	1.9940	2.3820	2.2730	27/32	0.8780	0.8100	3.0000	3.2500
1 1/2	1.5000	6	12	1.5000	1.4880	2 1/4	2.2500	2.1750	2.5980	2.4800	15/16	0.9740	0.9020	3.2500	3.5000

All dimensions are in inches.
Usable thread length for Hex Head Cap Screws under 6 1/4" long can be approximated by the equation THREAD LENGTH = (2 X DIAMETER) + 1/4″

A307 Hex Bolt, Galvanized

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Diameter	Thread Pitch	Length	Threading	Item #	Availability	Price	Quantity
1/4	20	1/2	Full	HHG20250050	In Stock	$0.04186/EA	EA	EA
1/4	20	3/4	Full	HHG20250075	In Stock	$0.05751/EA	EA	EA
1/4	20	1	Full	HHG20250100	In Stock	$0.06626/EA	EA	EA
1/4	20	1 1/4	Partial	HHG20250125	In Stock	$0.07401/EA	EA	EA
1/4	20	1 1/2	Partial	HHG20250150	In Stock	$0.11272/EA	EA	EA
1/4	20	2	Partial	HHG20250200	In Stock	$0.11432/EA	EA	EA
1/4	20	2 1/2	Partial	HHG20250250	In Stock	$0.19393/EA	EA	EA
1/4	20	3	Partial	HHG20250300	In Stock	$0.15027/EA	EA	EA
1/4	20	3 1/2	Partial	HHG20250350	In Stock	$0.25684/EA	EA	EA
1/4	20	4	Partial	HHG20250400	In Stock	$0.21042/EA	EA	EA
1/4	20	4 1/2	Partial	HHG20250450	In Stock	$0.20239/EA	EA	EA
1/4	20	5	Partial	HHG20250500	In Stock	$0.22269/EA	EA	EA
1/4	20	6	Partial	HHG20250600	In Stock	$0.45818/EA	EA	EA
5/16	18	1	Full	HHG20310100	In Stock	$0.12562/EA	EA	EA
5/16	18	1 1/4	Full	HHG20310125	In Stock	$0.17376/EA	EA	EA
5/16	18	1 1/2	Partial	HHG20310150	In Stock	$0.16641/EA	EA	EA
5/16	18	2	Partial	HHG20310200	In Stock	$0.15092/EA	EA	EA
5/16	18	2 1/2	Partial	HHG20310250	In Stock	$0.33637/EA	EA	EA
5/16	18	3	Partial	HHG20310300	In Stock	$0.20711/EA	EA	EA
5/16	18	3 1/2	Partial	HHG20310350	In Stock	$0.34152/EA	EA	EA
5/16	18	4	Partial	HHG20310400	In Stock	$0.3206/EA	EA	EA
5/16	18	4 1/2	Partial	HHG20310450	3-5 Working Days	$0.32693/EA	EA	EA
5/16	18	5	Partial	HHG20310500	In Stock	$0.35558/EA	EA	EA
5/16	18	6	Partial	HHG20310600	In Stock	$1.16306/EA	EA	EA
5/16	18	8	Partial	HHG20310800	3-5 Working Days	$1.47119/EA	EA	EA
3/8	16	1	Full	HHG20370100	In Stock	$0.17655/EA	EA	EA
3/8	16	1 1/4	Full	HHG20370125	In Stock	$0.23646/EA	EA	EA
3/8	16	1 1/2	Partial	HHG20370150	In Stock	$0.22577/EA	EA	EA
3/8	16	1 3/4	Partial	HHG20370175	In Stock	$0.31296/EA	EA	EA
3/8	16	2	Partial	HHG20370200	In Stock	$0.29888/EA	EA	EA
3/8	16	2 1/4	Partial	HHG20370225	In Stock	$0.29773/EA	EA	EA
3/8	16	2 1/2	Partial	HHG20370250	In Stock	$0.36262/EA	EA	EA
3/8	16	3	Partial	HHG20370300	In Stock	$0.45281/EA	EA	EA
3/8	16	3 1/2	Partial	HHG20370350	In Stock	$0.48759/EA	EA	EA
3/8	16	4	Partial	HHG20370400	In Stock	$0.71137/EA	EA	EA
3/8	16	4 1/2	Partial	HHG20370450	In Stock	$0.40431/EA	EA	EA
3/8	16	5	Partial	HHG20370500	In Stock	$0.6848/EA	EA	EA
3/8	16	5 1/2	Partial	HHG20370550	In Stock	$0.5083/EA	EA	EA
3/8	16	6	Partial	HHG20370600	In Stock	$1.38568/EA	EA	EA
3/8	16	7	Partial	HHG20370700	In Stock	$0.74707/EA	EA	EA
3/8	16	8	Partial	HHG20370800	In Stock	$0.6939/EA	EA	EA
3/8	16	9	Partial	HHG20370900	In Stock	$0.74312/EA	EA	EA
3/8	16	10	Partial	HHG20371000	In Stock	$1.53722/EA	EA	EA
3/8	16	12	Partial	HHG20371200	In Stock	$1.16422/EA	EA	EA
7/16	14	1	Full	HHG20430100	In Stock	$2.74609/EA	EA	EA
7/16	14	1 1/4	Full	HHG20430125	3-5 Working Days	$0.26445/EA	EA	EA
7/16	14	1 1/2	Full	HHG20430150	In Stock	$0.63863/EA	EA	EA
7/16	14	2	Partial	HHG20430200	In Stock	$0.5484/EA	EA	EA
7/16	14	2 1/2	Partial	HHG20430250	In Stock	$0.4043/EA	EA	EA
7/16	14	4 1/2	Partial	HHG20430450	In Stock	$0.74938/EA	EA	EA
1/2	13	3/4	Full	HHG20500075	In Stock	$0.19201/EA	EA	EA
1/2	13	1	Full	HHG20500100	In Stock	$0.37354/EA	EA	EA
1/2	13	1 1/4	Full	HHG20500125	In Stock	$0.38786/EA	EA	EA
1/2	13	1 1/2	Full	HHG20500150	In Stock	$0.47266/EA	EA	EA
1/2	13	1 3/4	Full	HHG20500175	In Stock	$0.63341/EA	EA	EA
1/2	13	2	Partial	HHG20500200	In Stock	$0.63875/EA	EA	EA
1/2	13	2 1/4	Partial	HHG20500225	In Stock	$0.56786/EA	EA	EA
1/2	13	2 1/2	Partial	HHG20500250	In Stock	$0.8106/EA	EA	EA
1/2	13	2 3/4	Partial	HHG20500275	In Stock	$0.75538/EA	EA	EA
1/2	13	3	Partial	HHG20500300	In Stock	$0.81502/EA	EA	EA
1/2	13	3 1/4	Partial	HHG20500325	In Stock	$0.49923/EA	EA	EA
1/2	13	3 1/2	Partial	HHG20500350	In Stock	$0.98852/EA	EA	EA
1/2	13	3 3/4	Partial	HHG20500375	In Stock	$1.15207/EA	EA	EA
1/2	13	4	Partial	HHG20500400	In Stock	$1.0899/EA	EA	EA
1/2	13	4 1/2	Partial	HHG20500450	In Stock	$1.12788/EA	EA	EA
1/2	13	5	Partial	HHG20500500	In Stock	$1.28329/EA	EA	EA
1/2	13	5 1/2	Partial	HHG20500550	In Stock	$1.63771/EA	EA	EA
1/2	13	6	Partial	HHG20500600	In Stock	$1.45764/EA	EA	EA
1/2	13	6 1/2	Partial	HHG20500650	In Stock	$2.23264/EA	EA	EA
1/2	13	7	Partial	HHG20500700	In Stock	$1.72527/EA	EA	EA
1/2	13	8	Partial	HHG20500800	In Stock	$2.03168/EA	EA	EA
1/2	13	9	Partial	HHG20500900	In Stock	$2.37654/EA	EA	EA
1/2	13	9 1/2	Partial	HHG20500950	3-5 Working Days	$2.68817/EA	EA	EA
1/2	13	10	Partial	HHG20501000	In Stock	$2.33353/EA	EA	EA
1/2	13	12	Partial	HHG20501200	In Stock	$2.62538/EA	EA	EA
1/2	13	14	Partial	HHG20501400	In Stock	$3.35334/EA	EA	EA
1/2	13	16	Partial	HHG20501600	In Stock	$4.02995/EA	EA	EA
1/2	13	18	Partial	HHG20501800	In Stock	$4.17838/EA	EA	EA
5/8	11	1	Full	HHG20620100	In Stock	$0.75631/EA	EA	EA
5/8	11	1 1/4	Full	HHG20620125	In Stock	$0.81039/EA	EA	EA
5/8	11	1 1/2	Full	HHG20620150	In Stock	$0.74205/EA	EA	EA
5/8	11	1 3/4	Full	HHG20620175	In Stock	$0.79989/EA	EA	EA
5/8	11	2	Full	HHG20620200	In Stock	$0.81691/EA	EA	EA
5/8	11	2 1/4	Partial	HHG20620225	In Stock	$1.07523/EA	EA	EA
5/8	11	2 1/2	Partial	HHG20620250	In Stock	$1.07196/EA	EA	EA
5/8	11	2 3/4	Partial	HHG20620275	In Stock	$1.41978/EA	EA	EA
5/8	11	3	Partial	HHG20620300	In Stock	$1.31102/EA	EA	EA
5/8	11	3 1/4	Partial	HHG20620325	In Stock	$1.53788/EA	EA	EA
5/8	11	3 1/2	Partial	HHG20620350	In Stock	$1.46365/EA	EA	EA
5/8	11	3 3/4	Partial	HHG20620375	In Stock	$0.40905/EA	EA	EA
5/8	11	4	Partial	HHG20620400	In Stock	$1.49192/EA	EA	EA
5/8	11	4 1/2	Partial	HHG20620450	In Stock	$1.72998/EA	EA	EA
5/8	11	5	Partial	HHG20620500	In Stock	$1.81635/EA	EA	EA
5/8	11	5 1/2	Partial	HHG20620550	In Stock	$2.54618/EA	EA	EA
5/8	11	6	Partial	HHG20620600	In Stock	$2.9521/EA	EA	EA
5/8	11	6 1/2	Partial	HHG20620650	In Stock	$2.66801/EA	EA	EA
5/8	11	7	Partial	HHG20620700	In Stock	$3.00007/EA	EA	EA
5/8	11	8	Partial	HHG20620800	In Stock	$2.80484/EA	EA	EA
5/8	11	9	Partial	HHG20620900	In Stock	$3.48931/EA	EA	EA
5/8	11	10	Partial	HHG20621000	In Stock	$3.52253/EA	EA	EA
5/8	11	11	Partial	HHG20621100	3-5 Working Days	$3.83099/EA	EA	EA
5/8	11	12	Partial	HHG20621200	In Stock	$4.14797/EA	EA	EA
5/8	11	14	Partial	HHG20621400	In Stock	$5.5327/EA	EA	EA
5/8	11	16	Partial	HHG20621600	In Stock	$6.28678/EA	EA	EA
5/8	11	18	Partial	HHG20621800	In Stock	$6.51769/EA	EA	EA
3/4	10	1	Full	HHG20750100	In Stock	$0.72833/EA	EA	EA
3/4	10	1 1/4	Full	HHG20750125	In Stock	$0.72833/EA	EA	EA
3/4	10	1 1/2	Full	HHG20750150	In Stock	$1.39596/EA	EA	EA
3/4	10	1 3/4	Full	HHG20750175	In Stock	$1.22917/EA	EA	EA
3/4	10	2	Full	HHG20750200	In Stock	$1.28256/EA	EA	EA
3/4	10	2 1/4	Full	HHG20750225	In Stock	$1.46697/EA	EA	EA
3/4	10	2 1/2	Full	HHG20750250	In Stock	$1.57713/EA	EA	EA
3/4	10	2 3/4	Partial	HHG20750275	In Stock	$1.60382/EA	EA	EA
3/4	10	3	Partial	HHG20750300	In Stock	$2.11679/EA	EA	EA
3/4	10	3 1/4	Partial	HHG20750325	In Stock	$3.45091/EA	EA	EA
3/4	10	3 1/2	Partial	HHG20750350	In Stock	$2.29425/EA	EA	EA
3/4	10	3 3/4	Partial	HHG20750375	3-5 Working Days	$1.87374/EA	EA	EA
3/4	10	4	Partial	HHG20750400	In Stock	$2.43299/EA	EA	EA
3/4	10	4 1/2	Partial	HHG20750450	In Stock	$2.49873/EA	EA	EA
3/4	10	4 3/4	Partial	HHG20750475	3-5 Working Days	$3.53241/EA	EA	EA
3/4	10	5	Partial	HHG20750500	In Stock	$2.82098/EA	EA	EA
3/4	10	5 1/2	Partial	HHG20750550	In Stock	$3.47021/EA	EA	EA
3/4	10	6	Partial	HHG20750600	In Stock	$3.24862/EA	EA	EA
3/4	10	6 1/2	Partial	HHG20750650	In Stock	$2.31245/EA	EA	EA
3/4	10	7	Partial	HHG20750700	In Stock	$3.01559/EA	EA	EA
3/4	10	7 1/2	Partial	HHG20750750	In Stock	$3.1118/EA	EA	EA
3/4	10	8	Partial	HHG20750800	In Stock	$3.97378/EA	EA	EA
3/4	10	8 1/2	Partial	HHG20750850	In Stock	$3.96031/EA	EA	EA
3/4	10	9	Partial	HHG20750900	In Stock	$5.40583/EA	EA	EA
3/4	10	10	Partial	HHG20751000	In Stock	$5.46038/EA	EA	EA
3/4	10	11	Partial	HHG20751100	3-5 Working Days	$5.86307/EA	EA	EA
3/4	10	12	Partial	HHG20751200	In Stock	$6.32538/EA	EA	EA
3/4	10	14	Partial	HHG20751400	In Stock	$7.13048/EA	EA	EA
3/4	10	16	Partial	HHG20751600	In Stock	$8.96147/EA	EA	EA
3/4	10	18	Partial	HHG20751800	In Stock	$9.80852/EA	EA	EA
7/8	9	1 1/2	Full	HHG20870150	In Stock	$1.16897/EA	EA	EA
7/8	9	2	Full	HHG20870200	In Stock	$3.17393/EA	EA	EA
7/8	9	2 1/4	Full	HHG20870225	In Stock	$2.65675/EA	EA	EA
7/8	9	2 1/2	Full	HHG20870250	In Stock	$1.5232/EA	EA	EA
7/8	9	2 3/4	Full	HHG20870275	In Stock	$2.36419/EA	EA	EA
7/8	9	3	Partial	HHG20870300	In Stock	$2.52745/EA	EA	EA
7/8	9	3 1/4	Partial	HHG20870325	3-5 Working Days	$5.03011/EA	EA	EA
7/8	9	3 1/2	Partial	HHG20870350	In Stock	$3.17209/EA	EA	EA
7/8	9	3 3/4	Partial	HHG20870375	In Stock	$2.22813/EA	EA	EA
7/8	9	4	Partial	HHG20870400	In Stock	$3.46164/EA	EA	EA
7/8	9	4 1/4	Partial	HHG20870425	3-5 Working Days	$5.84485/EA	EA	EA
7/8	9	4 1/2	Partial	HHG20870450	In Stock	$5.66479/EA	EA	EA
7/8	9	5	Partial	HHG20870500	In Stock	$3.60043/EA	EA	EA
7/8	9	5 1/2	Partial	HHG20870550	In Stock	$4.47131/EA	EA	EA
7/8	9	6	Partial	HHG20870600	In Stock	$3.243/EA	EA	EA
7/8	9	7	Partial	HHG20870700	3-5 Working Days	$3.55119/EA	EA	EA
7/8	9	8	Partial	HHG20870800	In Stock	$4.01045/EA	EA	EA
7/8	9	9	Partial	HHG20870900	In Stock	$6.51789/EA	EA	EA
7/8	9	10	Partial	HHG20871000	In Stock	$5.80195/EA	EA	EA
7/8	9	12	Partial	HHG20871200	In Stock	$5.80733/EA	EA	EA
1	8	1 1/2	Full	HHG21000150	In Stock	$0.03477/EA	EA	EA
1	8	2	Full	HHG21000200	In Stock	$1.7733/EA	EA	EA
1	8	2 1/4	Full	HHG21000225	3-5 Working Days	$3.27236/EA	EA	EA
1	8	2 1/2	Full	HHG21000250	In Stock	$3.2307/EA	EA	EA
1	8	2 3/4	Partial	HHG21000275	3-5 Working Days	$3.27236/EA	EA	EA
1	8	3	Full	HHG21000300	In Stock	$4.17072/EA	EA	EA
1	8	3 1/4	Partial	HHG21000325	In Stock	$5.30327/EA	EA	EA
1	8	3 1/2	Partial	HHG21000350	In Stock	$4.90476/EA	EA	EA
1	8	4	Partial	HHG21000400	In Stock	$5.133/EA	EA	EA
1	8	4 1/2	Partial	HHG21000450	In Stock	$4.96467/EA	EA	EA
1	8	5	Partial	HHG21000500	In Stock	$9.19204/EA	EA	EA
1	8	5 1/2	Partial	HHG21000550	In Stock	$5.09388/EA	EA	EA
1	8	6	Partial	HHG21000600	In Stock	$4.80574/EA	EA	EA
1	8	6 1/2	Partial	HHG21000650	In Stock	$4.13769/EA	EA	EA
1	8	7	Partial	HHG21000700	In Stock	$5.5596/EA	EA	EA
1	8	8	Partial	HHG21000800	In Stock	$7.98703/EA	EA	EA
1	8	9	Partial	HHG21000900	In Stock	$8.41446/EA	EA	EA
1	8	10	Partial	HHG21001000	In Stock	$8.21426/EA	EA	EA
1	8	12	Partial	HHG21001200	In Stock	$11.5653/EA	EA	EA
1	8	14	Partial	HHG21001400	In Stock	$14.90702/EA	EA	EA
1	8	16	Partial	HHG21001600	In Stock	$11.09179/EA	EA	EA
1	8	18	Partial	HHG21001800	In Stock	$13.24757/EA	EA	EA

A307 Hex Bolt, Galvanized

Technical Data

Tab 1

Governing StandardsA307

Tab 2

Mechanical PropertiesA307

Tab 3

Chemical PropertiesA307

Tab 4

Dimensional SpecificationsA307

Product Specification

Diameter

Thread Pitch

Length

Threading

Width Across Flats