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A307 Hex Bolt Manufacturer, Supplier and Factory In China

Ningbo Teng Qi Fasteners Co., Ltd is a professional manufacturer of A307 hex bolts. The A307 standard include two grades of carbon steel bolts and studs, ranging in diameter from 1/4 inch to 4 inches, while addressing both chemical and mechanical property requirements. We utilize high-quality carbon steel A36 to meet these specifications. A307 bolts are classified into Grade A and Grade B, each with specific performance standards and applications.

Dedicated to manufacturing A307 hex bolts with the high quality A36 carbon steel, we ensure strength, durability, and reliability in our products. Our bolts and studs undergo precision machining to meet stringent standards and perform admirably across various applications, whether in construction, infrastructure, or industrial settings. Through our professional manufacturing processes and rigorous quality control, we strive to deliver superior products and services that meet the diverse needs and requirements of our customers.

A307 Hex Bolt

Specification of A307 Hex Bolt:

The A307 specification outlines the requirements for carbon steel bolts and studs commonly used in construction and industrial applications. Here are some key specifications for A307 hex bolts:

Product nameA307 Hex Bolts
Material:A307 hex bolts are typically made from low to medium carbon steel. The most common material used is ASTM A36 steel, which provides good strength and ductility for general-purpose applications.
Grade:A307 bolts are divided into two grades: Grade A and Grade B.
Head Type:Hex Head or Heavy Hex Head
Size:A307 hex bolts are available in various diameters, typically ranging from 1/4 inch to 4 inches. The length of the bolts can vary depending on the specific application and requirements.
Dimension Standard:Unless otherwise specified, Grade A bolts shall be hex
bolts with dimensions as given in the latest issue of ASME
B18.2.1. Unless otherwise specified, Grade B bolts shall be
heavy hex bolts with dimensions as given in the latest issue of
ASME B18.2.1. Unless otherwise specified, threads on
threaded rod shall be per the requirements of the latest issue of
ASME B18.31.3.
Tension Strength:Grade A: 60ksi (min) Grade B: 60-100ksi (min)
Surface treatmentThe standard specifies surface finishes to enhance corrosion resistance and appearance. Common finishes include:
- Plain (uncoated)
- Zinc plating
- Hot-dip galvanizing
- Other corrosion-resistant coatings

Application of A307 Hex Bolt:

A307 hex bolts find widespread application across various industries and construction projects due to their versatility, strength, and reliability. Some common applications of A307 hex bolts include:

Construction:A307 hex bolts are extensively used in construction projects for fastening structural components such as beams, columns, and trusses. They provide robust connections that withstand the weight and stresses encountered in buildings, bridges, and other infrastructure.
Woodworking:In woodworking applications, A307 hex bolts are utilized to join wooden components such as framing members, decking, and furniture pieces. Their strong grip and durable construction make them ideal for securing wood-to-wood connections.
Machinery Assembly:A307 hex bolts play a crucial role in assembling machinery and equipment across various industries. They are used to secure moving parts, housings, and other components, ensuring the stability and functionality of machinery in manufacturing plants, automotive facilities, and beyond.
Railroad Construction:A307 hex bolts are commonly employed in railroad construction and maintenance for fastening rails to ties and connecting rail sections. Their ability to withstand heavy loads and vibrations makes them essential components in railway infrastructure.
Oil and Gas Industry:In the oil and gas sector, A307 hex bolts are utilized in pipelines, refineries, and offshore platforms to secure piping systems, equipment mounts, and structural elements. Their durability and resistance to corrosion make them suitable for harsh environmental conditions.
General Industrial Applications:A307 hex bolts find use in various industrial settings for fastening components in machinery, conveyor systems, industrial shelving, and material handling equipment. They provide dependable connections that endure the rigors of industrial operations.

Quality control of A307 Hex Bolt:

Control MethodDetail
Material Inspection:Verify the material's composition, heat treatment, and quality upon receipt. Conduct metallurgical analysis to ensure the material properties meet the standards.
Process Control:Implement strict process control measures for heat treatment, machining, threading, and any other manufacturing steps. Maintain consistent process parameters to ensure uniform quality.
Inspection Points:Introduce inspection points at various stages of manufacturing to check for defects, dimensions, and quality. Inspect threading, dimensions, surface finish, and other critical parameters.
Sampling and Testing:Regularly sample products for testing, such as tensile testing, hardness testing, and metallurgical analysis, to ensure they meet the required specifications.
Thread Inspection:Thoroughly inspect threading using proper thread gauges to ensure accurate dimensions and fit with mating components.
Traceability:Implement a traceability system to track each fasteners journey from raw material to final product. This aids in accountability and recalls if necessary.