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Flange Head Bolts
Flange head bolts feature a circular flange beneath the head that functions as an integrated washer, distributing clamping force over a larger area. This design reduces surface pressure, minimizes embedding in softer materials, and eliminates the need for separate washer components during assembly. The flange face may be plain or serrated to increase friction and resist loosening under dynamic loads. Zhejiang Chance & Union supplies flange head bolts in carbon steel, alloy steel, and stainless steel, with rolled threads and controlled under-head geometry to meet diverse industrial requirements.
Engineering & Design Features
Flange Geometry
- Integrated circular flange replaces separate washer
- Larger bearing surface reduces surface pressure and embedment
- Serrated flange face available for increased friction and locking
- Flange diameter and thickness controlled per DIN / ISO standards
Thread & Material
- Rolled threads for consistent class fit and fatigue resistance
- Available in carbon steel, alloy steel, and stainless steel
- Metric (6g) and inch (2A) thread classes
- Coarse and fine thread options
Surface & Coating
- Zinc plating · hot-dip galvanizing · phosphate
- Dacromet · Xylan · plain finish
- Coating selection based on corrosion resistance requirements
- Salt spray testing per ASTM B117 for validation
Typical Specifications
Detailed dimensional data and material certificates are provided with each order. Custom specifications available upon request.
Common Applications
- Automotive assemblies: Engine components, suspension systems, transmission housings, and axle connections.
- Heavy machinery: Construction equipment, agricultural implements, and material handling systems.
- Industrial equipment: Pump flanges, motor mounts, gearbox covers, and structural frame joints.
- Energy sector: Wind turbine yaw systems, solar tracker pivots, and power transmission equipment.
- General engineering: Any application requiring a larger bearing surface and resistance to vibration-induced loosening.
Procurement & Supply Chain
Production Capacity
- Facility area: over 30,000 m²
- 80+ units of multi-station cold headers
- Monthly production capacity: 800 tons
- Support for both prototyping and mass production
Inventory & Logistics
- Permanent stock: over 5,000 specifications
- Storage capacity: exceeding 2,000 tons
- 24-hour order processing
- 3-day rapid shipping for standard items
Quality Assurance & Testing
Testing Capabilities
- Optical sorting for 100% dimensional inspection
- 72-hour salt spray test per ASTM B117
- Tensile testing per ASTM E8
- Hardness testing per ASTM E18
- Ex-factory pass rate: 99.9%
Quality Systems
- ISO 9001 certified
- IATF 16949 certified
- Full traceability from raw material to finished product
- Material test reports (MTR) with heat numbers
- ≤30-minute factory response time
R&D and Engineering Support
With nearly 20 years of industry experience, our R&D team has developed over 1,000 custom fastener solutions for clients across 25 countries. We provide:
- Joint design consultation: Analysis of clamp load, torque requirements, and friction coefficients for optimized bolting.
- Customization: Non-standard flange diameters, under-head fillet radii, and special serration patterns.
- Prototyping: Rapid sample production for fit and performance validation before mass production.
- Coating selection: Guidance on corrosion protection based on environmental exposure and service life requirements.
Selection Guide for Flange Head Bolts
When selecting flange head bolts for your application, consider the following factors:
- Strength requirement: Determine the required property class (metric) or grade (inch) based on joint design and load conditions.
- Corrosion environment: Select coating and material (stainless steel vs. carbon steel with coating) based on exposure to moisture, chemicals, or salt.
- Flange type: Plain flange for standard applications; serrated flange for applications with vibration or dynamic loading.
- Assembly method: Consider torque-tension relationship and whether controlled tightening (e.g., torque-angle) is required.
- Standard compliance: Specify DIN, ISO, or ANSI standards for dimensional and performance requirements.
Frequently Asked Questions
Leveraging the factory's robust R&D and production capabilities, we specialize in high-strength rivets bolts, nuts, washers, pins, screws, and various non-standard custom parts. As experienced Custom Flange Head Bolts Suppliers, we provide flexible manufacturing solutions for different customer requirements. Our product range covers materials including stainless steel, alloy steel, aluminum alloy, copper, and special alloys, utilizing processes such as cold heading, hot forging, and CNC machining. Our products are exported to over 25 countries, serving more than 200 clients.
Chance & Union is committed to seamlessly connecting "Manufactured in China" with the international market, providing global customers with one-stop fastening solutions from R&D to mass production through professional technology and exceptional quality.
