Grade A307
Overview
Product sourcing insights & recommendations
The 'Grade A307' phrase refers to the ASTM A307 specification, a foundational standard for carbon steel fasteners used in general-purpose and piping applications. The market is currently seeing a steady growth trajectory, with the global bolts segment projected to reach $15.81 billion by 2035.
Key insights for 2026 indicate a shift toward digital traceability and automated quality inspection, even for these commodity-grade bolts. While Grade A remains the standard for everyday hardware, Grade B is specialized for piping flanges, and Grade C (anchor bolts) is increasingly being superseded by the newer F1554 Grade 36 standard.
I have compiled a detailed market insight report below, covering technical specifications, 2026 demand drivers, and benchmark sourcing options matching these grades.
Based on these market trends, you can continue with:
Astm A307 Grade B Heavy Hex Bolts For Piping Flanged Joints
Products · 3 lists
Gr2 Gr5 Gr8 ANSI/ASME B 18.2.1 A490 A325 A307 Metric Heavy Hex Head Bolt
Dongguan J And R Metalwork Industry Co., Ltd.verified🇨🇳CN9 yrs
MALAXY Fasteners B7 Bolt A325 Bolts A307 B Tensile Heavy Hex Astm Structural High M20 M24 Construction A320 L7 Strength Chemical
Shanghai Malaxy Industry Co., Ltd.verified🇨🇳CN5 yrs
DIN931 ASTM A325/A325M Astm A193 B7 A194 2H Hexagon Bolt A307 A490 Structural Bolts Heavy Duty Hex Head Screw Bolts
Kunshan Zhonggu Precision Hardware Co., Ltd.verified🇨🇳CN17 yrs
GB Standard Grade 10.9 Sex Ansi Hex Head Bolts/ Astm A307 Grade B Heavy Hex Flange Bolts
Hengshui Shunhai Kehua Import And Export Trading Co., Ltd.verified🇨🇳CN12 yrs
Size A307m Carbon Steel Astm A307 Grade 8.8 10.9 Heavy Hex Bolt
Shanghai Jinrui Norm Parts Supplies Co., Ltd.🇨🇳CN18 yrs
M30 M33 ASTM A307 Gr B 325 A325 Heavy Hex Bolt Black Grade 10.9 12.9
Shanghai G&T Industry Co., Ltd.verified🇨🇳CN5 yrs
M39 Gr 4.8 8.8 ASTM A307 SA 307 Grade B Grade a Carbon Steel Heavy Hex Structutal Bolts
Bester Industrial Technology Wuxi Co., Ltd.verified🇨🇳CN5 yrs
Factory Custom ASTM A307 Grade A/B ASME ANSI B18.5 Zinc-Plated Heavy Hexagon Head Bolt Nuts Washers UNC UNF Steel Material
Shanghai Gentle Fasteners Technology Co., Ltd.🇨🇳CN4 yrs
B7 Bolt A325 Bolts A307 B Tc Tensile Heavy Hex Astm Structural High M20 M24 Construction A320 L7 Strength Chemical
Ningbo Awesome Fasteners Co., Ltd.verified🇨🇳CN5 yrs
Heavy Hex Structure Bolts Various Zinc Plated for Aluminium Titanium Alloy-ASTM A193 B7/B7m A325/A490/A320 L7/L7m A307/A/B
High Tensile Black Heavy Hex Bolt ASTM A325/A490 Bolts and Nuts
Shanghai Jian & Mei Industry And Trade Co., Ltd.verified🇨🇳CN19 yrs
ASME B18.2.6M Magni 565 Zinc Flake Dacromet ASTM F3125 A490 A490M 7/8 1 1-1/8 1-1/4 Heavy Hex Structural Bolt
Shanghai G&T Industrial Co., Ltd.verified🇨🇳CN12 yrs
ANSI ASME B18.2.1 ASTM A307 A325 A449 Heavy Hex Bolts
Ningbo Transhow Fastener Co., Ltd.🇨🇳CN8 yrs
High Strength ASME/ANSI B 18.2.1 Astm A325 A193 B8 1/2'' 2'' Stainless Steel Heavy Hex Bolts and Nut
Wuxi Zhuocheng Mechanical Components Co., Ltd.verified🇨🇳CN20 yrs
Astm A325 M24 Heavy Structural Hex Head Bolt Hot Dip Galvanized Grade 8.8 High Tensile B7 Heavy Hex Bolts and Nuts Manufacturing
Jiangzhixin Technology (Shenzhen) Co., LTD.verified🇨🇳CN3 yrs
Good Quality Heavy Hex Bolts ASTM A320 Grades L7 L43
Shanghai Tengri Metal Products Co., Ltd.verified🇨🇳CN10 yrs
ASME SA-325 SA-449 TYPE3 C D F Zinc Coated Structural Heavy Hex Bolts
Ningbo Yinzhou Sokun Import And Export Co., Ltd.verified🇨🇳CN17 yrs
Type 1 Plain 7/8"-9x3 (PT) Heavy Hex Structural Bolt A490 ASTM F3125/F3125M A325, F1852, A490 Bolts
Wuxi Xiandeng Technology Co., Ltd.🇨🇳CN8 yrs
High Tensile B7 Heavy Hex Bolts and Nuts Manufacturing Hot Dip Galvanized Hex Full Thread Bolt With Nut and Washer
Kunshan Grace Precision Hardware Co., Ltd.🇨🇳CN13 yrs
Factory Price M16-M30 Heavy Hex Bolt ASTM A325 A490 Hexagon Bolts Hex Bolt
Hebei Ninggu Fastener Co., Ltd.🇨🇳CN3 yrs
ASME B18.2.6 ASTM F3125 Type A325 A325M A490 A490M Galvanized Heavy Hex Structural Bolts With DH/2H Nut and F436 Washer
Ningbo Yaoke Hardware Products Co., Ltd.🇨🇳CN2 yrsFactory Price M16-M30 Heavy Hex Bolt ASTM A325 A490 Hexagon Bolts Hex Bolt
ASME B18.2.6 ASTM F3125 Type A325 A325M A490 A490M Galvanized Heavy Hex Structural Bolts With DH/2H Nut and F436 Washer
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Sources & References
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Understanding ASTM A307 Bolts: Grades and Applications
California Fastener
ASTM A307 is a widely recognized specification for carbon steel bolts and studs used in general-purpose applications.
ASTM A307
Portland Bolt
The ASTM A307 specification covers carbon steel bolts and studs ranging from 1/4′′ through 4′′ diameter. This is your everyday, run of the mill bolt ...
Different Bolt Grades and Their Applications
Wilson-Garner
ASTM A307 Grade A – As low- to medium-strength carbon steel bolts, Grade A bolts offer a minimum strength of 60,000 psi. They're used for ...
A307 Standard Specification for Carbon Steel Bolts, Studs ...
ASTM International
This specification covers the chemical and mechanical requirements for three grades (Grades A, B, and C) of carbon steel bolts and studs in specified sizes.
ASTM A307 Bolts
a307bolts.com
A307 is a specification that covers carbon steel fasteners ranging from 1/4” through 4” in diameter. This is a generic, everyday bolt specification.
Hex Machine Bolt A307 Grade A Steel Hot Dipped Galvanized
newportfasteners.com
ASTM A307 Grade A hex machine bolts feature carbon steel construction with hot dip galvanized coating for superior corrosion resistance.