A307 Hex Bolt, Galvanized
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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.

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. 1. As measured anywhere on the surface or through the cross section.
  2. 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

Finished bolt and cap screw dimensions
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
  1. All dimensions are in inches.
  2. 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
View
Diameter Thread Pitch Length Threading Item # Availability Price Quantity UOM
1/4 20 1/2 Full HHG20250050 In Stock $0.04186/EA EA
1/4 20 3/4 Full HHG20250075 In Stock $0.05751/EA EA
1/4 20 1 Full HHG20250100 In Stock $0.0707/EA EA
1/4 20 1 1/4 Partial HHG20250125 In Stock $0.07401/EA EA
1/4 20 1 1/2 Partial HHG20250150 In Stock $0.11293/EA EA
1/4 20 2 Partial HHG20250200 In Stock $0.11427/EA EA
1/4 20 2 1/2 Partial HHG20250250 In Stock $0.19393/EA EA
1/4 20 3 Partial HHG20250300 In Stock $0.15027/EA EA
1/4 20 3 1/2 Partial HHG20250350 In Stock $0.25684/EA EA
1/4 20 4 Partial HHG20250400 In Stock $0.21042/EA EA
1/4 20 4 1/2 Partial HHG20250450 In Stock $0.20239/EA EA
1/4 20 5 Partial HHG20250500 In Stock $0.22269/EA EA
1/4 20 6 Partial HHG20250600 In Stock $0.45818/EA EA
5/16 18 1 Full HHG20310100 In Stock $0.12562/EA EA
5/16 18 1 1/4 Full HHG20310125 In Stock $0.17376/EA EA
5/16 18 1 1/2 Partial HHG20310150 In Stock $0.16641/EA EA
5/16 18 2 Partial HHG20310200 In Stock $0.15092/EA EA
5/16 18 2 1/2 Partial HHG20310250 In Stock $0.33637/EA EA
5/16 18 3 Partial HHG20310300 In Stock $0.20711/EA EA
5/16 18 3 1/2 Partial HHG20310350 In Stock $0.34152/EA EA
5/16 18 4 Partial HHG20310400 In Stock $0.3206/EA EA
5/16 18 4 1/2 Partial HHG20310450 3-5 Working Days $0.32693/EA EA
5/16 18 5 Partial HHG20310500 In Stock $0.35558/EA EA
5/16 18 6 Partial HHG20310600 In Stock $1.16306/EA EA
5/16 18 8 Partial HHG20310800 3-5 Working Days $1.47119/EA EA
3/8 16 1 Full HHG20370100 In Stock $0.17655/EA EA
3/8 16 1 1/4 Full HHG20370125 In Stock $0.23837/EA EA
3/8 16 1 1/2 Partial HHG20370150 In Stock $0.2274/EA EA
3/8 16 1 3/4 Partial HHG20370175 In Stock $0.31348/EA EA
3/8 16 2 Partial HHG20370200 In Stock $0.2986/EA EA
3/8 16 2 1/4 Partial HHG20370225 In Stock $0.29773/EA EA
3/8 16 2 1/2 Partial HHG20370250 3-5 Working Days $0.36239/EA EA
3/8 16 3 Partial HHG20370300 In Stock $0.45325/EA EA
3/8 16 3 1/2 Partial HHG20370350 In Stock $0.48759/EA EA
3/8 16 4 Partial HHG20370400 In Stock $0.71137/EA EA
3/8 16 4 1/2 Partial HHG20370450 In Stock $0.40431/EA EA
3/8 16 5 Partial HHG20370500 In Stock $0.80419/EA EA
3/8 16 5 1/2 Partial HHG20370550 In Stock $0.5083/EA EA
3/8 16 6 Partial HHG20370600 In Stock $1.38568/EA EA
3/8 16 7 Partial HHG20370700 In Stock $0.74707/EA EA
3/8 16 8 Partial HHG20370800 In Stock $0.69382/EA EA
3/8 16 9 Partial HHG20370900 In Stock $0.74312/EA EA
3/8 16 10 Partial HHG20371000 In Stock $1.53722/EA EA
3/8 16 12 Partial HHG20371200 In Stock $1.16406/EA EA
7/16 14 1 Full HHG20430100 In Stock $2.74609/EA EA
7/16 14 1 1/4 Full HHG20430125 3-5 Working Days $0.26445/EA EA
7/16 14 1 1/2 Full HHG20430150 In Stock $0.63863/EA EA
7/16 14 2 Partial HHG20430200 In Stock $0.5484/EA EA
7/16 14 2 1/2 Partial HHG20430250 In Stock $0.4043/EA EA
7/16 14 4 1/2 Partial HHG20430450 In Stock $0.74938/EA EA
1/2 13 3/4 Full HHG20500075 In Stock $0.19201/EA EA
1/2 13 1 Full HHG20500100 In Stock $0.37492/EA EA
1/2 13 1 1/4 Full HHG20500125 In Stock $0.38786/EA EA
1/2 13 1 1/2 Full HHG20500150 In Stock $0.52008/EA EA
1/2 13 1 3/4 Full HHG20500175 In Stock $0.67857/EA EA
1/2 13 2 Partial HHG20500200 In Stock $0.64105/EA EA
1/2 13 2 1/4 Partial HHG20500225 In Stock $0.64028/EA EA
1/2 13 2 1/2 Partial HHG20500250 In Stock $0.83575/EA EA
1/2 13 2 3/4 Partial HHG20500275 In Stock $0.75703/EA EA
1/2 13 3 Partial HHG20500300 In Stock $0.81432/EA EA
1/2 13 3 1/4 Partial HHG20500325 In Stock $0.49923/EA EA
1/2 13 3 1/2 Partial HHG20500350 In Stock $0.98852/EA EA
1/2 13 3 3/4 Partial HHG20500375 In Stock $1.15207/EA EA
1/2 13 4 Partial HHG20500400 3-5 Working Days $1.20872/EA EA
1/2 13 4 1/2 Partial HHG20500450 In Stock $1.25499/EA EA
1/2 13 5 Partial HHG20500500 In Stock $1.53241/EA EA
1/2 13 5 1/2 Partial HHG20500550 In Stock $1.6768/EA EA
1/2 13 6 Partial HHG20500600 In Stock $1.70165/EA EA
1/2 13 6 1/2 Partial HHG20500650 In Stock $2.23264/EA EA
1/2 13 7 Partial HHG20500700 In Stock $1.72527/EA EA
1/2 13 8 Partial HHG20500800 In Stock $2.72016/EA EA
1/2 13 9 Partial HHG20500900 In Stock $2.37654/EA EA
1/2 13 9 1/2 Partial HHG20500950 3-5 Working Days $2.68817/EA EA
1/2 13 10 Partial HHG20501000 In Stock $2.33479/EA EA
1/2 13 12 Partial HHG20501200 In Stock $2.62538/EA EA
1/2 13 14 Partial HHG20501400 In Stock $3.38694/EA EA
1/2 13 16 Partial HHG20501600 In Stock $4.93241/EA EA
1/2 13 18 Partial HHG20501800 In Stock $4.074/EA EA
5/8 11 1 Full HHG20620100 In Stock $0.75631/EA EA
5/8 11 1 1/4 Full HHG20620125 In Stock $0.81039/EA EA
5/8 11 1 1/2 Full HHG20620150 In Stock $0.8622/EA EA
5/8 11 1 3/4 Full HHG20620175 In Stock $0.82317/EA EA
5/8 11 2 Full HHG20620200 In Stock $1.0362/EA EA
5/8 11 2 1/4 Partial HHG20620225 In Stock $1.07777/EA EA
5/8 11 2 1/2 Partial HHG20620250 In Stock $1.07196/EA EA
5/8 11 2 3/4 Partial HHG20620275 In Stock $1.41978/EA EA
5/8 11 3 Partial HHG20620300 In Stock $1.38097/EA EA
5/8 11 3 1/4 Partial HHG20620325 In Stock $1.527/EA EA
5/8 11 3 1/2 Partial HHG20620350 In Stock $1.54112/EA EA
5/8 11 3 3/4 Partial HHG20620375 In Stock $0.40905/EA EA
5/8 11 4 Partial HHG20620400 In Stock $1.45006/EA EA
5/8 11 4 1/2 Partial HHG20620450 In Stock $1.72994/EA EA
5/8 11 5 Partial HHG20620500 In Stock $2.01739/EA EA
5/8 11 5 1/2 Partial HHG20620550 In Stock $2.64317/EA EA
5/8 11 6 Partial HHG20620600 In Stock $2.95251/EA EA
5/8 11 6 1/2 Partial HHG20620650 In Stock $2.66801/EA EA
5/8 11 7 Partial HHG20620700 In Stock $3.19058/EA EA
5/8 11 8 Partial HHG20620800 In Stock $3.30384/EA EA
5/8 11 9 Partial HHG20620900 In Stock $4.56953/EA EA
5/8 11 10 Partial HHG20621000 In Stock $3.79151/EA EA
5/8 11 11 Partial HHG20621100 In Stock $9.03218/EA EA
5/8 11 12 Partial HHG20621200 In Stock $4.13311/EA EA
5/8 11 14 Partial HHG20621400 In Stock $8.51769/EA EA
5/8 11 16 Partial HHG20621600 In Stock $6.49534/EA EA
5/8 11 18 Partial HHG20621800 In Stock $7.98652/EA EA
3/4 10 1 Full HHG20750100 In Stock $0.72833/EA EA
3/4 10 1 1/4 Full HHG20750125 In Stock $0.72833/EA EA
3/4 10 1 1/2 Full HHG20750150 In Stock $1.39079/EA EA
3/4 10 1 3/4 Full HHG20750175 In Stock $1.22928/EA EA
3/4 10 2 Full HHG20750200 In Stock $1.3102/EA EA
3/4 10 2 1/4 Full HHG20750225 In Stock $1.48813/EA EA
3/4 10 2 1/2 Full HHG20750250 In Stock $1.57735/EA EA
3/4 10 2 3/4 Partial HHG20750275 In Stock $1.60342/EA EA
3/4 10 3 Partial HHG20750300 In Stock $2.11016/EA EA
3/4 10 3 1/4 Partial HHG20750325 In Stock $3.45091/EA EA
3/4 10 3 1/2 Partial HHG20750350 In Stock $2.25124/EA EA
3/4 10 3 3/4 Partial HHG20750375 In Stock $2.43343/EA EA
3/4 10 4 Partial HHG20750400 In Stock $2.43299/EA EA
3/4 10 4 1/2 Partial HHG20750450 In Stock $2.46387/EA EA
3/4 10 4 3/4 Partial HHG20750475 3-5 Working Days $3.53241/EA EA
3/4 10 5 Partial HHG20750500 In Stock $2.82098/EA EA
3/4 10 5 1/2 Partial HHG20750550 In Stock $3.47021/EA EA
3/4 10 6 Partial HHG20750600 In Stock $3.24862/EA EA
3/4 10 6 1/2 Partial HHG20750650 In Stock $2.31245/EA EA
3/4 10 7 Partial HHG20750700 In Stock $3.01559/EA EA
3/4 10 7 1/2 Partial HHG20750750 In Stock $3.1118/EA EA
3/4 10 8 Partial HHG20750800 In Stock $3.97378/EA EA
3/4 10 8 1/2 Partial HHG20750850 In Stock $3.96031/EA EA
3/4 10 9 Partial HHG20750900 In Stock $5.40583/EA EA
3/4 10 10 Partial HHG20751000 In Stock $5.46952/EA EA
3/4 10 11 Partial HHG20751100 3-5 Working Days $5.86307/EA EA
3/4 10 12 Partial HHG20751200 In Stock $7.1134/EA EA
3/4 10 14 Partial HHG20751400 In Stock $8.2776/EA EA
3/4 10 16 Partial HHG20751600 In Stock $9.04767/EA EA
3/4 10 18 Partial HHG20751800 In Stock $9.8638/EA EA
7/8 9 1 1/2 Full HHG20870150 In Stock $1.16897/EA EA
7/8 9 2 Full HHG20870200 In Stock $3.17393/EA EA
7/8 9 2 1/4 Full HHG20870225 In Stock $2.65675/EA EA
7/8 9 2 1/2 Full HHG20870250 In Stock $1.5232/EA EA
7/8 9 2 3/4 Full HHG20870275 In Stock $2.36426/EA EA
7/8 9 3 Partial HHG20870300 In Stock $2.52745/EA EA
7/8 9 3 1/4 Partial HHG20870325 3-5 Working Days $5.03011/EA EA
7/8 9 3 1/2 Partial HHG20870350 In Stock $3.17209/EA EA
7/8 9 3 3/4 Partial HHG20870375 In Stock $2.22813/EA EA
7/8 9 4 Partial HHG20870400 In Stock $3.46557/EA EA
7/8 9 4 1/4 Partial HHG20870425 3-5 Working Days $5.84485/EA EA
7/8 9 4 1/2 Partial HHG20870450 In Stock $5.06553/EA EA
7/8 9 5 Partial HHG20870500 In Stock $8.05526/EA EA
7/8 9 5 1/2 Partial HHG20870550 In Stock $4.47131/EA EA
7/8 9 6 Partial HHG20870600 In Stock $3.26188/EA EA
7/8 9 7 Partial HHG20870700 3-5 Working Days $3.55119/EA EA
7/8 9 8 Partial HHG20870800 In Stock $4.01045/EA EA
7/8 9 9 Partial HHG20870900 In Stock $6.51789/EA EA
7/8 9 10 Partial HHG20871000 In Stock $5.80195/EA EA
7/8 9 12 Partial HHG20871200 In Stock $5.80733/EA EA
1 8 1 1/2 Full HHG21000150 In Stock $0.03477/EA EA
1 8 2 Full HHG21000200 In Stock $1.7733/EA EA
1 8 2 1/4 Full HHG21000225 3-5 Working Days $3.27236/EA EA
1 8 2 1/2 Full HHG21000250 In Stock $3.2307/EA EA
1 8 2 3/4 Partial HHG21000275 3-5 Working Days $3.27236/EA EA
1 8 3 Full HHG21000300 In Stock $5.60226/EA EA
1 8 3 1/4 Partial HHG21000325 In Stock $5.30327/EA EA
1 8 3 1/2 Partial HHG21000350 In Stock $4.90476/EA EA
1 8 4 Partial HHG21000400 In Stock $5.133/EA EA
1 8 4 1/2 Partial HHG21000450 In Stock $4.96467/EA EA
1 8 5 Partial HHG21000500 In Stock $9.19204/EA EA
1 8 5 1/2 Partial HHG21000550 In Stock $5.09388/EA EA
1 8 6 Partial HHG21000600 In Stock $4.80574/EA EA
1 8 6 1/2 Partial HHG21000650 In Stock $4.13769/EA EA
1 8 7 Partial HHG21000700 In Stock $5.5596/EA EA
1 8 8 Partial HHG21000800 In Stock $7.98703/EA EA
1 8 9 Partial HHG21000900 In Stock $8.41446/EA EA
1 8 10 Partial HHG21001000 In Stock $8.21426/EA EA
1 8 12 Partial HHG21001200 In Stock $11.5653/EA EA
1 8 14 Partial HHG21001400 In Stock $14.90702/EA EA
1 8 16 Partial HHG21001600 In Stock $11.09179/EA EA
1 8 18 Partial HHG21001800 In Stock $13.24757/EA EA