Din 6921 Flange Bolts

DIN 6921 hex head flange bolts are well-designed and highly functional fasteners suitable for environments with high vibration and heavy loads. Their advantages include easy installation and excellent anti-loosening performance, making them suitable for various industries.

High Quality Din 6921 Flange Bolts

SSM manufactures DIN 6921 hex head flange bolts with a flange, following the German industrial standard DIN 6921. These bolts are typically used in machinery and structures that require high-strength fastening, especially in applications that experience significant vibration or heavy loads.

Size: M5-M20
Metric coarse screw thread / Metric fine screw thread
Materials: Steel 8.8,10.9,12.9 Stainless steel A2-A70, Nickel alloy steel …
Coatings: Blackened, Bright

Steel Din 6921 Flange Bolts

These bolts are made of carbon steel, often with heat treatments to enhance strength and durability.

Stainless Din 6921 Flange Bolts

Made from stainless steel (commonly grades A2 or A4), it is known for its excellent corrosion resistance.

Nickel Alloy Din 6921 Flange Bolts

These bolts are made from nickel alloys like Inconel, Monel, or Hastelloy, which offer exceptional resistance to corrosion, heat, and oxidation.

Features of Din 6921 Flange Bolts

Hex Head Design: Allows quick installation and removal using standard wrench tools, simplifying the operation process.
Flange Structure: The head features an integral flange that distributes the pressure between the bolt and the contact surface, functioning similarly to a washer.
High-Strength Material: Typically made from carbon steel, stainless steel, or alloy steel, and heat-treated to enhance strength and corrosion resistance, suitable for high-load environments.
Thread Type: Can be fully threaded or partially threaded to accommodate different fastening requirements.
Anti-Loosening Design: The flange base may have serrations to increase friction and reduce the impact of vibrations on bolt loosening.

Application of Din 6921 Flange Bolts

Automotive Industry: DIN 6921 bolts are widely used in vehicle chassis, suspension systems, and engine components because they remain secure under dynamic loads.
Machinery Equipment: In the assembly process of industrial machinery, these bolts are used in areas requiring high-strength connections where vibrations may occur, such as fixed parts of heavy equipment or machining tools.
Construction Industry: These bolts provide additional stability and anti-loosening features when used in steel structure connections or concrete embedments.
Electrical Equipment: DIN 6921 bolts ensure high strength and durability when securing motor housings or cabinets.

Advantages & Disadvantages of Din 6921 Flange Bolts

Advantages:

Easy Installation: Flanged bolts do not require additional washers, reducing installation time and lowering costs.
Higher Load Capacity: The flange provides a larger contact area, dispersing pressure and preventing damage to the contact surface. It performs well on soft materials.
Good Anti-Loosening Performance: The serrations at the bottom of the flange effectively prevent the bolt from loosening due to vibrations, making it suitable for dynamic load environments.
Space-Saving: The flanged head design eliminates the need for separate washers, reducing the assembly’s overall height.
Corrosion Treatment: The surface is typically treated with galvanization, phosphating, or oxidation to enhance corrosion resistance, making it suitable for outdoor or humid environments.

Disadvantages:

Slightly Higher Cost: Because flanged head bolts are formed as a single piece, their material and manufacturing costs are generally slightly higher than those of standard hex bolts.
Limited Application Scope: The size of the flange may limit its application in some cases, especially in situations requiring precision fastening or where space is restricted.
Flanged Head May Scratch Surfaces: If the bottom of the flange has a serrated design, it may scratch the surface when fastened during installation, particularly on finely finished materials.

One-Stop Din 6921 Flange Bolts Provider for All Your Needs

SSM has significant product advantages in manufacturing Din 6921 Flange Bolts, Whether it’s quality or price, we will meet your needs.

More Information About Din 6921 Flange Bolts

This standard specifies product grade A hexagon flange bolts with metric coarse screw thread or metric fine screw thread from 5 up to and including 20 mm nominal thread diameter. If, in special cases, specifications other than those listed in this standard are required, e.g., different nominal lengths or property classes, these shall be selected by the appropriate standards.

Din 6921 Flange Bolts Dimensions

Metric Hex Flange Bolt (DIN 6921) Dimensions

DIN 6921 Standard vs Grooved Design

Standard design features a smooth flange at the base of the hex head, which distributes the load over a larger surface area. This reduces the risk of damage to the parts being fastened and often eliminates the need for a separate washer.

Grooved Design involves adding grooves or serrations to the underside of the flange. These grooves increase friction between the bolt and its fastening surface, enhancing the anti-loosening capability. The serrations “bite” into the surface, making it more resistant to loosening caused by vibration.

Designation of DIN 6921 Bolts

Designation of a standard design hexagon flange bolt with thread size d=M 10,length L=60 mm, and property class 10.9:
Hexagon head bolt DIN 6921-M 10× 60-10.9
If a grooved design is required, then the letter symbol Ho shall be included in the designation,e.g.
Hexagon bolt DIN 6921-M10× 60-Ho-10.9

What is the ISO equivalent of DIN 6921?

DIN 6921: This standard specifies hexagon flange bolts with dimensions, material grades, and strength grades suitable for various applications commonly found in automotive and general engineering.
EN 1665: This European standard equivalent aligns closely with DIN 6921, ensuring similar specifications and applications across Europe.
ISO 4162: This international standard also specifies hexagon flange bolts, maintaining compatibility with the DIN and EN standards and promoting uniformity in global applications.

Comparison of Hex Flange Bolts: DIN 6921, EN 1665, and ISO 4162

Feature	DIN 6921	EN 1665	ISO 4162
Standard Title	Hexagon Flange Bolts	Hexagon Flange Bolts	Hexagon Flange Bolts
Head Type	Hexagon flange	Hexagon flange	Hexagon flange
Material	Typically carbon steel, stainless steel, or alloy steel	Carbon steel, stainless steel, or alloy steel	Carbon steel, stainless steel, or alloy steel
Strength Grades	8.8, 10.9, 12.9	8.8, 10.9, 12.9	8.8, 10.9, 12.9
Diameter Range	M5 to M30	M5 to M30	M5 to M30
Length Range	Up to 300 mm	Up to 300 mm	Up to 300 mm
Flange Design	Integral flange with serrations	Integral flange with serrations	Integral flange with serrations
Surface Finish	Various finishes (zinc-plated, etc.)	Various finishes (zinc-plated, etc.)	Various finishes (zinc-plated, etc.)
Applications	General engineering applications, automotive, and machinery	General engineering applications, automotive, and machinery	General engineering applications, automotive, and machinery

Why Can SSM Provide You with High-Quality DIN 6921 Bolts?

SSM can provide high-quality DIN 6921 bolts due to its expertise, use of premium materials, advanced manufacturing processes, rigorous quality control, customization options, compliance with industry standards, customer-centric approach, and competitive pricing.

More Resources:

https://en.wikipedia.org/wiki/Fastener