ASTM A325 heavy hex structural bolts in carbon steel, available across a range of metric property classes (4.8, 6.8, 8.8, 10.9, 12.9) to accommodate both standard assembly and high-load tension connections. Manufactured under ISO 898-1 and ASTM F3125 quality protocols.
ASTM A325 heavy hex structural bolts in carbon steel, available across a range of metric property classes (4.8, 6.8, 8.8, 10.9, 12.9) to accommodate both standard assembly and high-load tension connections. Manufactured under ISO 898-1 and ASTM F3125 quality protocols.
Product Introduction
ASTM A325 heavy hex structural bolts in carbon steel, available across a range of metric property classes (4.8, 6.8, 8.8, 10.9, 12.9) to accommodate both standard assembly and high-load tension connections. Manufactured under ISO 898-1 and ASTM F3125 quality protocols.
Material & Mechanical Properties
Forged from medium carbon steel and quenched/tempered where specified. Mechanical values are certified per lot with available MTRs.Class 8.8 / 10.9: Equivalent to A325 Type 1 mechanical requirementsClass 12.9: High-tensile variant for applications requiring yield strength exceeding 1100 MPa.
Geometry & Thread Form
Hexagonal head conforms to ASME B18.2.1 and DIN 931/933 dimensional standards. Coarse thread pitch per ISO 724. Coarse pitch mitigates thread stripping in structural steel and accelerates assembly torque cycles.
Corrosion Protection
Zinc electroplated per ASTM B633 (Fe/Zn 5-8μm) as standard. For outdoor exposure and atmospheric corrosion (C3-C4 environments), hot-dip galvanizing to ASTM A153 Class C is specified.
Application Suitability
Steel fabrication, heavy equipment mounting, bridge bearing connections, and pre-engineered metal building erection.
Product Introduction
ASTM A325 heavy hex structural bolts in carbon steel, available across a range of metric property classes (4.8, 6.8, 8.8, 10.9, 12.9) to accommodate both standard assembly and high-load tension connections. Manufactured under ISO 898-1 and ASTM F3125 quality protocols.
Material & Mechanical Properties
Forged from medium carbon steel and quenched/tempered where specified. Mechanical values are certified per lot with available MTRs.Class 8.8 / 10.9: Equivalent to A325 Type 1 mechanical requirementsClass 12.9: High-tensile variant for applications requiring yield strength exceeding 1100 MPa.
Geometry & Thread Form
Hexagonal head conforms to ASME B18.2.1 and DIN 931/933 dimensional standards. Coarse thread pitch per ISO 724. Coarse pitch mitigates thread stripping in structural steel and accelerates assembly torque cycles.
Corrosion Protection
Zinc electroplated per ASTM B633 (Fe/Zn 5-8μm) as standard. For outdoor exposure and atmospheric corrosion (C3-C4 environments), hot-dip galvanizing to ASTM A153 Class C is specified.
Application Suitability
Steel fabrication, heavy equipment mounting, bridge bearing connections, and pre-engineered metal building erection.
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.

ASTM F3125 Grade A325M Type 1 heavy hex structural bolt – quenched and tempered medium carbon steel heavy hex head bolt manufactured to ASTM F3125/F3125M, the consolidated specification replacing ASTM A325M . Metric sizes M12–M36 inclusive . Minimum ...

ASTM F3125 Grade A490 Heavy Hex Structural Bolt – Quenched and tempered alloy steel heavy hex structural bolt per ASTM F3125/F3125M (consolidating former ASTM A490). Inch sizes 1/2″–1-1/2″ . Minimum tensile strength 150 ksi (1,040 MPa), yield streng...

ASTM A325 Heavy Hex Structural Bolt – Quenched and tempered heavy hex structural bolt per ASTM A325, now consolidated under ASTM F3125 Grade A325. Diameters 1/2″–1-1/2″. Types: Type 1 (medium carbon, carbon boron, or medium carbon alloy steel) and T...

BS EN 15048-1 SB Half-Thread Hexagon Head Bolt – Non-preloaded structural bolting assembly per BS EN 15048-1:2016, bolt conforming to ISO 4014 (partial thread) with unthreaded shank through shear planes. Diameters M12–M39 for steel structures per EN...

QBH ISO 8677 large head carriage bolts are manufactured from carbon steel with property class 8.8. Featuring a large round head and square neck, they provide a secure fastening solution for applications requiring a smooth head profile and reliable ti...

QBH manufactures ASME B18.5 round head square neck bolts in ASTM A307 Grade A carbon steel, featuring a minimum tensile strength of 60,000 psi. Available in inch sizes with customized lengths, thread configurations and surface finishes for general fa...

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QBH manufactures DIN 939 carbon steel double end studs with a 1.25d tap end and metric threads. With our manufacturing base in Ningbo, China, we offer different sizes, lengths and property classes, with drawing-based customization to meet specific ap...

QBH manufactures ASTM A307 Grade A carbon steel double end stud bolts for general industrial and mechanical fastening applications. Backed by our specialized manufacturing base in Ningbo, China, we focus on precision bolt and threaded rod production...

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ASTM A193 Grade B7 Black Heavy Hex Stud Bolt – Fully threaded stud bolt in chromium-molybdenum ferritic alloy steel per ASTM A193 Grade B7, supplied in black oxide finish. Minimum tensile strength 125 ksi (862 MPa), minimum yield strength 105 ksi (7...

ASTM A307 Grade B Heavy Hex Bolt, 3/8″–2″ – Low/medium carbon steel heavy hex head bolt per ASTM A307. UNC thread. Minimum tensile strength 60 ksi (414 MPa), maximum 100 ksi (690 MPa); hardness B69–B95; no proof load requirement. Heavy hex dimension...

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ASTM F3125 Grade A325M Type 1 heavy hex structural bolt – quenched and tempered medium carbon steel heavy hex head bolt manufactured to ASTM F3125/F3125M, the consolidated specification replacing ASTM A325M . Metric sizes M12–M36 inclusive . Minimum ...

ASTM F3125 Grade A490 Heavy Hex Structural Bolt – Quenched and tempered alloy steel heavy hex structural bolt per ASTM F3125/F3125M (consolidating former ASTM A490). Inch sizes 1/2″–1-1/2″ . Minimum tensile strength 150 ksi (1,040 MPa), yield streng...

ASTM A325 Heavy Hex Structural Bolt – Quenched and tempered heavy hex structural bolt per ASTM A325, now consolidated under ASTM F3125 Grade A325. Diameters 1/2″–1-1/2″. Types: Type 1 (medium carbon, carbon boron, or medium carbon alloy steel) and T...

BS EN 15048-1 SB Half-Thread Hexagon Head Bolt – Non-preloaded structural bolting assembly per BS EN 15048-1:2016, bolt conforming to ISO 4014 (partial thread) with unthreaded shank through shear planes. Diameters M12–M39 for steel structures per EN...

QBH ISO 8677 large head carriage bolts are manufactured from carbon steel with property class 8.8. Featuring a large round head and square neck, they provide a secure fastening solution for applications requiring a smooth head profile and reliable ti...

QBH manufactures ASME B18.5 round head square neck bolts in ASTM A307 Grade A carbon steel, featuring a minimum tensile strength of 60,000 psi. Available in inch sizes with customized lengths, thread configurations and surface finishes for general fa...

QBH manufactures ASME B18.31.2 double-end studs in SAE J429 Grade 8 Medium Carbon Alloy Steell for high-strength fastening applications. With our manufacturing base in Ningbo, China, we offer inch-thread sizes, customized lengths and thread configura...

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