307a CYI Hex Bolt: High-Strength Fastening Solution for Demanding Applications
In the world of industrial fastening, reliability and precision are non-negotiable. The 307a cyi hex bolt stands as a premier solution engineered for applications where standard fasteners fall short. This high-grade hex bolt is designed to deliver exceptional tensile strength, superior corrosion resistance, and unwavering performance under extreme stress and environmental conditions. Ideal for OEM manufacturing, heavy machinery, structural assemblies, and critical infrastructure projects, the 307a specification ensures a perfect balance of durability and mechanical integrity. This product page details why the 307a cyi hex bolt is the trusted choice for engineers and procurement specialists worldwide.
Product Overview
The 307a cyi hex bolt is a metric, hexagon head bolt manufactured to meet stringent international quality standards, including ISO and DIN specifications. The "307a" designation refers to its specific material composition and property class, typically indicating a medium-carbon steel alloy that has been quenched and tempered to achieve high strength. The "CYI" marking is often associated with reputable manufacturer identification and quality assurance. Characterized by its six-sided head for secure tool engagement and a fully or partially threaded shank, this bolt is a cornerstone component for creating robust, permanent, or semi-permanent connections in metal-to-metal and metal-to-other-material assemblies.
Key Features
- High Tensile Strength: Manufactured from quenched and tempered medium carbon steel (property class 8.8 or 10.9), the 307a cyi hex bolt offers excellent resistance to shear and tensile forces, preventing failure in high-load environments.
- Superior Surface Finish: Available with various protective coatings such as zinc plating (yellow or blue passivate), hot-dip galvanizing, or geomet, providing enhanced corrosion resistance for indoor and outdoor applications.
- Precision Engineering: Consistent thread pitch and dimensional accuracy ensure easy installation, uniform clamping force, and compatibility with standard hex nuts and tapped holes.
- Durable Hex Head Design: The hexagonal head allows for high torque application with common wrenches and sockets, reducing the risk of rounding and ensuring a secure, reliable fastening point.
- Wide Temperature Tolerance: Maintains mechanical properties across a broad operational temperature range, making it suitable for diverse industrial climates.
Technical Specifications
| Parameter | Specification |
|---|---|
| Standard | DIN 933 / DIN 931, ISO 4014 / ISO 4017, Equivalent to ANSI B18.2.1 |
| Property Class | 8.8, 10.9 (Common) |
| Material | Medium Carbon Steel (Alloy Steel available) |
| Finish / Coating | Zinc Plated, Hot-Dip Galvanized, Geomet, Plain, Black Oxide |
| Diameter (M) | M6, M8, M10, M12, M16, M20, M24, and larger upon request |
| Length | 20mm to 300mm (Standard), Custom lengths available |
| Thread Type | Full Thread (DIN 933) or Partial Thread (DIN 931) |
| Head Style | Hexagon |
Application Scenarios
The versatility and strength of the 307a cyi hex bolt make it indispensable across numerous sectors:
- Heavy Machinery & Equipment: Used in the assembly of construction equipment, agricultural machinery, and mining rigs where vibration resistance is critical.
- Structural Steelwork: Essential for connecting beams, brackets, and supports in building frameworks, bridges, and industrial platforms.
- Transportation Industry: Employed in truck chassis, trailer assemblies, and railcar components requiring high fatigue strength.
- Renewable Energy: Key fasteners in wind turbine towers and solar panel mounting structures, exposed to harsh weather.
- General Manufacturing: Widely used in factory automation, conveyor systems, and heavy-duty product frames.
Advantages
Choosing the 307a cyi hex bolt provides tangible benefits to your production line and final product integrity:
- Enhanced Safety & Reliability: High property class guarantees a consistent safety margin, reducing the risk of joint failure and associated downtime or hazards.
- Cost-Effective Maintenance: Superior corrosion protection extends service life, minimizing replacement frequency and long-term maintenance costs.
- Streamlined Procurement: Conformance to international standards ensures easy sourcing of matching nuts and washers, simplifying your supply chain.
- Optimized Performance: The precise engineering allows for accurate torque application, ensuring even load distribution and optimal joint performance.
Why Choose Us
As a leading supplier in the industrial fastener market, we distinguish ourselves through unwavering commitment to quality and service:
- Certified Quality Assurance: Every batch of our 307a cyi hex bolts undergoes rigorous testing for hardness, tensile strength, and coating thickness, backed by full mill certificates.
- Extensive Inventory: We stock a vast range of sizes, grades, and finishes, ready for immediate shipment to meet urgent project timelines.
- Technical Expertise: Our team provides expert guidance on fastener selection, helping you choose the optimal 307a cyi hex bolt specification for your specific application.
- Global Logistics Network: We ensure reliable, on-time delivery to your factory or job site, anywhere in the world, with comprehensive export documentation.
- Competitive Pricing: By optimizing our manufacturing and supply chain, we offer exceptional value without compromising on the quality of our 307a cyi hex bolt products.
FAQ
What does "307a cyi" signify on the hex bolt?
"307a" typically denotes a specific material grade and property class (often 8.8 or 10.9). "CYI" is a manufacturer's identification mark, signifying the origin and ensuring traceability to a certified production source, which is crucial for quality control in B2B transactions.
What is the difference between Property Class 8.8 and 10.9 for the 307a hex bolt?
Property Class indicates tensile strength. Class 8.8 has a minimum tensile strength of 800 MPa, while Class 10.9 offers 1000 MPa. The 10.9 grade is harder and stronger, suitable for more critical, high-stress applications. The choice depends on your design load requirements.
Can I get the 307a cyi hex bolt with anti-corrosion coating?
Absolutely. We supply these bolts with various coatings. Zinc plating is standard for general use, hot-dip galvanizing is recommended for outdoor/structural applications, and Geomet or other advanced coatings are available for extreme corrosive environments.
Do you offer custom sizes or private labeling?
Yes. We provide customization in diameter, length, thread type, and coating. Private labeling and custom packaging are also available for large-volume OEM partners to support your brand identity.
What are your payment and shipping terms?
We offer flexible payment terms including T/T, L/C, and others. Shipping can be arranged via air, sea, or express courier (FOB, CIF, DAP, etc.), tailored to your logistical needs and budget. Contact our sales team for a precise quotation.
