DIN 6331 manufactured in accordance with the standard hexagon-reinforced flanged nuts, It is designed to provide high connection strength even in tight installation spaces. Despite its low height, its thick and wide body structure ensures strong and secure mounting with screws and bolts. It is particularly preferred in flange connections, pressurized systems, and compact industrial equipment.
| Feature | |
| Standard | DIN 6331 – Hexagon Reinforced Flanged Nut |
| Material | Carbon Steel, Alloy Steel, Stainless Steel |
| Material Quality | 5, 6, 8, 10, 12, A2, A4 |
| Coating | Electrogalvanized (White/Yellow), Hot-Dip Galvanized (HDG), Nickel, Black Oxide, Dacromet, Geomet |
| Tooth Type | Metric Coarse Thread, Metric Fine Thread (optional) |
| Measurement Range | From M10 to M64 |
| Production Method | Hot Forging, Machining |
| Thread Direction | Right-Hand Thread (standard) / Left-Hand Thread (upon request) |
- Flange connections made with bolts
- Pressure vessels, boilers, and industrial valve connections
- Heavy machinery and equipment installations
- Petrochemical and power plant applications
- Shipbuilding and offshore structures
- Industrial piping systems
- Fasteners under high torque and tension
- ISO 9001:2015 Quality Management System
- ISO 14001:2015 Environmental Management System
- ISO 45001:2018 Occupational Health and Safety Management System
- EU Declaration of Conformity (PED) certificate (Compliance with the Pressure Equipment Directive)
- Our production processes, DIN, EN, ISO, and ASTM is fully compliant with the standards
- Upon request EN 10204 3.1 certificate is provided
DIN 6331 is a nut standard that stands out for its wide-bodied and reinforced design despite its low-profile structure. In flange connections It has been developed for applications requiring high torque and strength.
Key features:
• Reinforced wide body structure
• Easy installation in tight spaces thanks to its low profile
• High load carrying capacity
• Shows dimensional similarity with ISO 8675
DIN 6331 nuts are generally manufactured from various materials such as carbon steel (e.g., strength classes 5, 8, 10), stainless steel (such as A2/304 and A4/316), and alloy steel. Material selection should be based on criteria such as the environmental conditions where the connection will be made, the load amount, and the risk of corrosion.
Commonly used materials are as follows:
• Carbon steel: Provides strength from low to high with grades such as Class 5, 6, 8, 10, 12
• Alloy steel: Systems operating under high temperature and pressure (e.g., with B7/B16 bolts)
• Stainless steel: Offers high corrosion resistance with A2 (304) and A4 (316) grades
• Brass / Copper alloys: Generally not preferred, except for special applications
DIN 6331 reinforced flanged nuts, At special connection points that require low height but high strength is preferred. Its wide body provides secure and strong tightening in screw connections.
Typical applications:
• Flanged pipe lines and valve systems
• Pressure vessels and power plant systems
• Compact industrial assemblies
• Heavy machinery and vibrating systems
• Petrochemical and shipbuilding applications
• Connections requiring secondary fastening in confined spaces
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