DIN 6921 Flange-Type Structural Fasteners are manufactured with an integrated flange under the hexagonal head, providing a larger bearing surface and improved load distribution without the need for separate washers. Designed for structural, automotive, machinery, and equipment assembly applications.
Available in carbon steel, alloy steel, and stainless steel grades, our DIN 6921 flange bolts can be supplied with multiple strength classes and surface treatments to meet various environmental and mechanical requirements.
Technical Specifications
Our manufacturing processes strictly adhere to DIN 6921 dimensional tolerances, ensuring seamless integration into your existing bills of materials (BOM).
d: Nominal Thread Diameter
s: Width Across Flats (Hex Head)
k: Hex Head Height
dc: Integrated Flange Diameter
e: Width Across Corners
l / b: Bolt Length / Thread Length Options
| Parameter | Specification |
| Product Name | DIN 6921 Flange-Type Structural Fastener |
| Standard | DIN 6921 |
| Product Type | Hex Flange Bolt |
| Head Type | Hexagonal Flange Head |
| Thread Type | Metric Coarse Thread |
| Diameter Range | M5 – M24 |
| Length Range | 10 mm – 300 mm |
| Thread Option | Full Thread / Partial Thread |
| Material | Carbon Steel, Alloy Steel, Stainless Steel |
| Carbon Steel Grade | Class 4.8, 8.8, 10.9 |
| Stainless Steel Grade | A2-70, A4-80 |
| Manufacturing Process | Cold Forging / Hot Forging |
| Heat Treatment | Available for High-Strength Grades |
| Surface Finish | Plain, Black Oxide, Zinc Plated, HDG, Dacromet, Geomet |
| Corrosion Resistance | According to Surface Treatment Selection |
| Tolerance | DIN Standard Tolerance |
| Packaging | Bulk, Carton, Pallet, OEM Packaging |
| OEM / ODM Service | Available |
Applications
Automotive Industry-Used in engine assemblies, suspension systems, chassis components, and body structure connections.
Machinery Manufacturing-Suitable for industrial pumps, compressors, machine tools, and heavy equipment assembly.
Construction & Infrastructure-Widely used in steel structures, bridges, equipment platforms, and structural connection systems.
Electrical Equipment-Applied in electrical cabinets, control systems, and industrial enclosures where reliable fastening is required.
Custom Manufacturing Options
| Customization Item | Available Options |
| Size | Custom diameter, length, thread length, and non-standard dimensions |
| Material | Carbon Steel, Alloy Steel, Stainless Steel (A2, A4) |
| Strength Grade | 4.8, 8.8, 10.9, A2-70, A4-80 |
| Thread Type | Full Thread, Partial Thread, Special Thread |
| Surface Finish | Zinc Plated, HDG, Dacromet, Geomet, Black Oxide |
| Head Marking | Custom logo, grade marking, manufacturer identification |
| Packaging | Bulk, Carton, Pallet, Private Label Packaging |
| Documentation | Material Certificate, Inspection Report, CO, COO |
Rigorous Manufacturing & Quality Assurance
We operate under strict ISO 9001:2015 frameworks. Every production lot is fully traceable from raw wire rod to finished product.
Our Production Pipeline:
Raw Material Verification: Mill Test Certificates (MTC) verification for chemical composition and clean steel properties.
Precision Cold Forging: High-speed multi-station headers ensure perfect concentricity between the hex head and the integrated flange.
Precision Thread Rolling: Work-hardened threads for superior fatigue life compared to cut threads.
Controlled Atmosphere Heat Treatment: Continuous quenching and tempering furnaces eliminate surface decarburization.
100% Optical Sorting: Automated vision system inspection for sorting thread defects, flash, and critical dimensional variances before shipping.
Documentation Provided with Shipment:
Material Test Certificate (EN 10204 3.1)
Dimensional Inspection Reports
Coating Thickness / Salt Spray Test Reports
Certificate of Origin (CO)
FAQ
Q: What packaging options do you offer?
A: We provide bulk carton packaging, palletized export packaging, and customized OEM packaging with private labels, barcodes, and product identification.
Q: Can you support scheduled or partial shipments?
A: Yes. Blanket orders and scheduled deliveries are available to help customers manage inventory and project timelines.
Q: What is your typical lead time?
A: Stock items are typically shipped within 3–7 business days, while custom production orders usually require 25–45 days, depending on specifications and quantity.
Q: Which shipping terms do you support?
A: We support EXW, FOB, CFR, CIF, and DDP terms, with sea freight, air freight, and express delivery options available.
Q: What documents can you provide?
A: We can provide Material Test Certificates (EN 10204 3.1), inspection reports, coating test reports, and Certificates of Origin upon request.
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