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This product is a high-strength structural bolt manufactured strictly in accordance with the ASTM A325 standard (now incorporated into ASTM F3125 as the A325 grade). It is the most widely used core fastener for steel structure connections in buildings and bridges in North America and worldwide. The
Product Standards
ASTM F3125/F3125M Grade A325 (replaces original ASTM A325)
Material and Process
Medium carbon alloy steel, quenched and tempered
Strength Grade
Grade A325
Head Type
Heavy hex head, dimensions conform to ASME B18.2.6
Specification Range
Available in a complete diameter series from 1/2 inch to 1-1/2 inches, and lengths can be customized as needed.
Surface Treatment
Hot-dip galvanized (according to ASTM A153)
Matching Nuts
ASTM A563 Grade DH or DH3 heavy hex nuts (When galvanized, use 2B grade oversize nuts and lubrication required).
Matching Washers
ASTM F436 Type 1 hardened washers (for A325 bolts); Type 3 washers (for weathering steel A325 bolts).
Key Certifications
ISO 9001:2015 quality management system certification, supports third-party inspection.
Main Applications
Structural steel in buildings (beams, columns, truss connections), bridge engineering, power plant facilities, heavy industrial plants, stadiums, and other connections requiring slip-resistant or high-strength bolting.
This product is a high-strength structural bolt manufactured strictly in accordance with the ASTM A325 standard (now incorporated into ASTM F3125 as the A325 grade). It is the most widely used core fastener for steel structure connections in buildings and bridges in North America and worldwide. The bolt features a heavy hex head design and is made of medium carbon alloy steel through quenching and tempering, providing excellent tensile strength and load-bearing capacity. Its key advantage lies in its suitability for hot-dip galvanization for corrosion protection, perfectly addressing the long-term protection challenges for steel structures exposed to outdoor, coastal, or industrial corrosive environments. Compared to the higher-strength A490 bolts, it is a more practical and economical choice. As a factory with over 20 years of manufacturing experience, we ensure that every batch of products meets the standard and can provide full ISO 9001 certification and third-party inspection support.
Core Features and Advantages:
Authoritative Standard, Reliable Performance: Strictly follows ASTM F3125/F3125M (A325 grade) standards, meeting the highest safety requirements for heavy steel structure connections.
Excellent Galvanizability: Hot-dip galvanized according to ASTM A153 standard, making it the ideal choice for bridges, outdoor venues, coastal facilities, and other corrosive environments.
Complete Supporting System: Provides heavy hex nuts of DH/DH3 grade that comply with ASTM A563 and hardened washers that comply with ASTM F436, ensuring the overall performance and reliability of the connection system.
Proven Applications Across Industries: Used in thousands of high-rise buildings, industrial plants, and large bridge projects worldwide each year, with safety and reliability verified through long-term engineering practice.
