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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
| Item | Specification |
|---|---|
| Product Standard | ASTM F3125/F3125M Grade A325 (replaces original ASTM A325) |
| Material & Process | Medium carbon alloy steel, quenched and tempered |
| Strength Grade | Grade A325 |
| Head Type | Heavy hex head, dimensions conform to ASME B18.2.6 |
| Size Range | Diameter 1/2" ~ 1-1/2", lengths customizable |
| Surface Treatment | Hot-dip galvanized (ASTM A153) |
| Matching Nuts | ASTM A563 DH / DH3 heavy hex nuts (DH3 oversize for galvanized, lubrication required) |
| Matching Washers | ASTM F436 Type 1 hardened washers (standard A325); Type 3 (weathering steel A325) |
| Certifications | ISO 9001:2015, third-party inspection available |
| Applications | High-rise buildings, bridges, industrial plants, towers, wind & solar steel structures |
This product is a high‑strength structural bolt manufactured strictly in accordance with ASTM A325 standard (now incorporated into ASTM F3125 as the A325 grade). Per ASTM specifications, A325 bolts are available in two material types: Type 1 and Type 3.
Type 1 is produced from ordinary carbon steel, carbon‑boron steel or alloy steel;
Type 3 is made of weathering steel for outdoor service conditions, delivering superior corrosion resistance.
Adopting a heavy hex head design, the bolt is fabricated from medium‑carbon alloy steel via quenching and tempering, delivering outstanding tensile strength and load‑bearing capacity. It serves as the most widely‑adopted core fastener for steel‑structure connections across North America and globally.
Its key advantage is excellent adaptability to hot‑dip galvanizing for corrosion protection, which perfectly solves long‑term protection challenges for steel structures deployed in outdoor, coastal or industrial corrosive environments. Compared with higher‑strength A490 bolts, it offers better practicality and cost‑effectiveness.
As a factory with more than 20 years of manufacturing experience, we guarantee every batch complies with relevant standards. Full ISO 9001 certification and third‑party inspection documents are available upon request.
Authoritative Standard, Reliable PerformanceStrictly conforms to ASTM F3125/F3125M (A325 grade), satisfying top‑tier safety requirements for heavy‑duty steel‑structure connections.
Excellent Galvanizability & Corrosion ResistanceHot‑dip galvanized in compliance with ASTM A153. Ideal for bridges, open‑air sites, coastal installations and other corrosive‑environment applications. Type 3 weather‑steel variant further boosts outdoor anti‑corrosion performance.
Complete Matching Connection SystemSupplied with DH / DH3 heavy hex nuts complying with ASTM A563 and hardened washers to ASTM F436, securing overall connection‑system performance and reliability.
Wide‑range Proven Field ApplicationsWidely deployed in steel‑structure projects including high‑rise buildings, bridges, towers and industrial steel workshops. It bears main‑structure fixation and critical load‑bearing joint duties. Especially vital for bridge construction, where complicated loading demands high material strength and durability to secure structural stability and service life. With booming wind‑power and solar‑power industries, A325 bolts are also extensively adopted for installation and fixation of new‑energy equipment. Year‑after‑year deployment in thousands of global landmark projects validates its long‑term engineering safety and dependability.
