A325 A490 Heavy Hex Bolts
Product: HEAVY HEX BOLTS
Standard: ASTM A325/325M A490/A490M
Raw material: 35K 45K,40CR,35CRMO 42CRMO,etc.
Surface: Plain,zinc plated,black oxide,H.D.G,Teflon, Geomet, Dacromet, Phosphated etc.
Specification Range: M12-M36 ,1/2”-1.1/2”
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Product Introduction
Product: HEAVY HEX BOLTS
Standard: ASTM A325/325M A490/A490M
Raw material: 35K 45K,40CR,35CRMO 42CRMO,etc.
Surface: Plain,zinc plated,black oxide,H.D.G,Teflon, Geomet, Dacromet, Phosphated etc.
Specification Range: M12-M36 ,1/2"-1.1/2"
Property Class:A325, A490 8S 10S
Mechanical Properties
|
Characteristic |
A325 |
A490 |
|
Strength Grade Equivalence |
ISO 8.8 |
ISO 10.9 |
|
Minimum Tensile Strength |
830 MPa (M≤16) / 860 MPa (M>16) |
1040 MPa (M≤16) / 1070 MPa (M>16) |
|
Minimum Yield Strength |
620 MPa (M≤16) / 655 MPa (M>16) |
830 MPa (M≤16) / 860 MPa (M>16) |
|
Hardness Range |
22–32 HRC |
32–39 HRC |
Product Overview
A325/A490 heavy hex bolts are premium high-strength fasteners designed specifically for steel structure connections, compliant with American standards ASTM A325/A325M and A490/A490M. As widely recognized core components in construction and engineering fields, they deliver exceptional reliability and load-bearing capacity for critical structural applications.
Key Specifications
Category Details
Raw Materials 35K, 45K, 40Cr, 35CrMo, 42CrMo, and other high-quality alloy steels/carbon steels
Surface Treatments Plain, zinc plating, black oxide, hot-dip galvanizing (H.D.G), Teflon coating, Geomet coating, Dacromet, phosphating, etc.
Specification Range Metric: M12–M36; Imperial: 1/2"–1 1/2"
Property Classes A325, A490, 8S, 10S
Product Characteristics
A325 Heavy Hex Bolts
Crafted from carbon or low-alloy steel, these bolts feature a hexagonal head, partial thread design, and are commonly finished with hot-dip galvanizing or black oxide. Boasting high strength, they are the preferred choice for standard building steel structure connections, balancing performance and cost-effectiveness.
A490 Heavy Hex Bolts
Manufactured from medium-carbon alloy steel, these bolts offer ultra-high strength with a hexagonal head, partial thread, and typical black oxide finish. Engineered for heavy-load and high-demand steel structure connections, they excel in scenarios requiring superior mechanical performance and structural stability.
Application Fields
A325
Ideal for general building structures, bridges, communication towers, industrial workshops, warehouses, and other steel structure projects with standard load requirements.
A490
Suitable for high-demand scenarios including long-span steel structures, heavy-duty machinery, lifting equipment, nuclear power plants, high-rise buildings, and other projects requiring exceptional load-bearing capacity and safety redundancy.
Usage Precautions
Installation:
Utilize a torque wrench to tighten in two stages per the designed torque value. Avoid over-tightening (which may damage threads or fasteners) or under-tightening (which risks structural loosening).
Environmental Adaptation:
Hot-dip galvanizing is recommended for humid or outdoor environments to enhance corrosion resistance. For marine environments with high chloride exposure, specialized anti-corrosion treatments are mandatory.
Maintenance:
Conduct regular inspections. Promptly replace bolts if signs of loosening, corrosion, thread damage, or material fatigue are detected.
Critical Taboos:
Reuse of A325/A490 bolts is strictly prohibited after disassembly, as fatigue damage may compromise structural safety. Do not mix bolts of different grades, materials, or specifications in the same connection.
Main Sales Markets
North America, the European Union, the Middle East, and Southeast Asia.
Packaging and Logistics
- Packaging Options: Small bags, small boxes, cartons, pallets, and iron drums. Customized packaging solutions are available to meet specific customer requirements.
- Order Flexibility: Bulk ordering is supported with flexible schemes. Transportation terms and delivery schedules are negotiable to align with customer project timelines.
Certification and Quality Assurance
Certified to international quality standards including ISO9001:2015 and IATF16949:2016.
We provide long-term quality guarantees and comprehensive after-sales services, ensuring product performance and customer satisfaction throughout the project lifecycle.
FAQ: Key Differences Between A325/A490 and Standard Hex Bolts
The core distinctions lie in strength grade, material & manufacturing process, application scenarios, and usage specifications:
Strength Grade & Mechanical Performance:
Standard hex bolts: Common grades (4.8, 5.6, 8.8) with tensile strength ≤800 MPa and yield strength ≤640 MPa, suitable for general low-load applications.
A325: High-strength (ISO 8.8 equivalent) with tensile strength ≥830 MPa, ideal for standard steel structure loads.
A490: Ultra-high-strength (ISO 10.9 equivalent) with tensile strength ≥1040 MPa, engineered for heavy-load critical connections.
Material & Manufacturing Process:
Standard hex bolts: Typically made of ordinary carbon steel (e.g., Q235, 45# steel) with simple production processes; surface treatments limited to black oxide or basic zinc plating.
A325/A490: A325 uses carbon/low-alloy steel with quenching-tempering heat treatment; A490 employs medium-carbon alloy steel with stricter heat treatment controls. Both feature advanced surface protection (e.g., hot-dip galvanizing, Dacromet) for enhanced durability.
Application Scenarios:
Standard hex bolts: Used in non-critical structures (e.g., household furniture, light machinery) with low load-bearing demands.
A325/A490: Exclusively designed for steel structures, serving as core safety fasteners in construction, bridges, heavy machinery, and other high-reliability projects.
One-stop Usage Specifications:
Standard hex bolts: Flexible installation with no strict torque requirements; reusable.
A325/A490: Require precise torque-controlled installation, must be paired with high-strength nuts and washers; reuse is strictly forbidden to prevent structural failure.
In summary, A325/A490 are "high-performance enhanced" hex bolts tailored for steel structure safety, offering far superior strength, durability, and reliability compared to standard hex bolts.
Established in 2005, our company has evolved over two decades of continuous development into a leading regional enterprise in the fastener industry with fully automated end-to-end production. With an annual output value exceeding RMB 130 million, our product range covers diverse market segments from mid-range to high-end and is distributed worldwide
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