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ASTM F3125 A325
A325 Carbon Steel Hex Bolts
A325 Carbon Steel Hex Bolts is the most commonly used hex bolt in the metric bolt, A325 Carbon Steel Hex Bolts common grades are 4.8, 6.8, 8.8, 10.9, 12.9. A325 Carbon Steel Hex Bolts surface is coated with different coatings for different environments.
A325 Carbon Steel Hex Bolts is the most commonly used hex bolt in the metric bolt, A325 Carbon Steel Hex Bolts common grades are 4.8, 6.8, 8.8, 10.9, 12.9. A325 Carbon Steel Hex Bolts surface is coated with different coatings for different environments.
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Product Details
A325 Carbon Steel Hex Bolts | Structural Fasteners
Product Introduction
ASTM A325 heavy hex structural bolts in carbon steel, manufactured to ASME B18.2.1 dimensions and available across a comprehensive range of metric property classes — 4.8, 6.8, 8.8, 10.9, and 12.9. The product line covers both standard mechanical assemblies and high-load tension joints where controlled preload is specified. Multiple surface finishes are available to match in-service environmental conditions.
Material & Mechanical Properties
Forged from medium carbon steel and heat-treated by quenching and tempering where required by the property class. Charpy impact values, proof load, and tensile strength per ISO 898-1 are certified by heat lot, with mill test reports supplied upon request. Classes 8.8 and 10.9 align with the mechanical requirements historically associated with A325 Type 1 bolting.
Geometry & Thread Form
The heavy hexagonal head provides a wrench-ready bearing surface for open-end, box, or power sockets, reducing radial tool slip during torque cycles. Coarse pitch metric thread per ISO 724 speeds assembly, lowers the risk of cross-threading in structural steel, and resists stripping under vibration better than fine-pitch alternatives.
Corrosion Protection
Zinc electroplated per ASTM B633 (Fe/Zn, 5–8 µm) is the standard finish, offering effective red rust resistance for sheltered outdoor and indoor environments. Hot-dip galvanized, zinc-nickel, and other engineered coating systems are specified for higher corrosivity categories (C3–C5 per ISO 9223).
Application Suitability
Steel-to-steel connections in commercial construction, pre-engineered metal buildings, heavy machinery frames, bridge secondary members, and industrial bracing where reliable clamp force and long-term durability are required.
Technical Parameters
| Place of Origin | CHINA |
| Standard | A325 Carbon Steel Hex Bolts |
| HS CODE | 7318159001 |
| Brand Name | QBH |
| Certification | ISO9001 |
| Material | 35K, 40Cr, 35CrMo, SCM435，etc. |
| Size | M3-M64 |
| Production Process | Cold forging≤300mm, Hot forging≤1000mm |
| Class | 4.8/ 6.8/ 8.8/ 10.9/ 12.9 |
| Delivery Time | Within 30 Days |
A325 Carbon Steel Hex Bolts | Structural Fasteners
Product Introduction
ASTM A325 heavy hex structural bolts in carbon steel, manufactured to ASME B18.2.1 dimensions and available across a comprehensive range of metric property classes — 4.8, 6.8, 8.8, 10.9, and 12.9. The product line covers both standard mechanical assemblies and high-load tension joints where controlled preload is specified. Multiple surface finishes are available to match in-service environmental conditions.
Material & Mechanical Properties
Forged from medium carbon steel and heat-treated by quenching and tempering where required by the property class. Charpy impact values, proof load, and tensile strength per ISO 898-1 are certified by heat lot, with mill test reports supplied upon request. Classes 8.8 and 10.9 align with the mechanical requirements historically associated with A325 Type 1 bolting.
Geometry & Thread Form
The heavy hexagonal head provides a wrench-ready bearing surface for open-end, box, or power sockets, reducing radial tool slip during torque cycles. Coarse pitch metric thread per ISO 724 speeds assembly, lowers the risk of cross-threading in structural steel, and resists stripping under vibration better than fine-pitch alternatives.
Corrosion Protection
Zinc electroplated per ASTM B633 (Fe/Zn, 5–8 µm) is the standard finish, offering effective red rust resistance for sheltered outdoor and indoor environments. Hot-dip galvanized, zinc-nickel, and other engineered coating systems are specified for higher corrosivity categories (C3–C5 per ISO 9223).
Application Suitability
Steel-to-steel connections in commercial construction, pre-engineered metal buildings, heavy machinery frames, bridge secondary members, and industrial bracing where reliable clamp force and long-term durability are required.
Technical Parameters
| Place of Origin | CHINA |
| Standard | A325 Carbon Steel Hex Bolts |
| HS CODE | 7318159001 |
| Brand Name | QBH |
| Certification | ISO9001 |
| Material | 35K, 40Cr, 35CrMo, SCM435，etc. |
| Size | M3-M64 |
| Production Process | Cold forging≤300mm, Hot forging≤1000mm |
| Class | 4.8/ 6.8/ 8.8/ 10.9/ 12.9 |
| Delivery Time | Within 30 Days |
FAQ
1. How do you let me trust you.
Jiaxing City Qunbang Hardware Co.,ltd hs its own right of import and export,QBH trademark in China,United States,European Union have been registered.At the same time,you can also check the registration information of our company in the China industry and Commerce system.
2. How about your price.
We will be based on different markets,for different quality and quantity,tailor-made prices for customers,in order to achieve win-win goal.
3. How do you control your quality.
Incoming quality contral( IQC)→Process Quality control(PQC)→Output quality control(OQC),and the random samples is sent to TUV for testing.If the customer received the goods and found quality problems,QBH company promises to be responsible for returning money or replenishing the goods
4. Could you provide free samples?
For new customer, We can provide free samples for standard fastener, But the clients will pay the express
charges. For old customer, We will send you free samples and pay express charges by ourself.
5. What is your packing.
Usually 25KG/carbon,36CTNS on the pallets,or 20-30kg/Bags,then on the pallet,QBH company personalized packagingis also available,like 10PCS/plastic bag or 10pcs/box,it can print some information
such as LOGO and pattern of customers.
6. What is your payment term
Normally,our terms of payment are TT and L/C,if we cooperate for a long time,we can reach the point of mutual trust,and fully support our customers to become bigger and stronger in the local market.Not only in the price concessions,but also in the payment can also be made on credit,Specific credit sales time needs to be negotiated separately.
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