Flange Bolt

DIN6921 Hexagonal Flange Bolt

DIN6921 Hexagonal Flange Bolt Metric Without Serration, our bolts offer exceptional performance and reliability in even the most demanding environments. The hexagon flange design of these bolts provides a larger bearing surface and a more secure fastening, ensuring that your equipment remains safe and secured at all times. Additionally, our bolts are designed with a metric thread which is perfect for use in a wide range of industrial and engineering applications.

DIN6921 Hexagonal Flange Bolt Metric Without Serration, our bolts offer exceptional performance and reliability in even the most demanding environments. The hexagon flange design of these bolts provides a larger bearing surface and a more secure fastening, ensuring that your equipment remains safe and secured at all times. Additionally, our bolts are designed with a metric thread which is perfect for use in a wide range of industrial and engineering applications.

Product Details

Product Introduction
Metric hexagonal flange bolts manufactured to DIN 6921 without serration under the bearing surface. The integrated flange increases the contact area and eliminates the need for a separate washer. Diameters M5 through M20 are stocked, with larger sizes available by order, across property classes 8.8, 10.9, and 12.9 per ISO 898-1. Surface treatments are applied in accordance with service environment requirements.

Material & Mechanical Properties
Produced from medium carbon alloy steel and quench-and-tempered to meet the proof load, tensile, and hardness values of the designated property class. Heat-number traceability is maintained through the manufacturing process, and certified test reports are issued upon request. Class 8.8 and 10.9 cover the majority of medium- and high-strength bolting applications; class 12.9 provides ultimate tensile strength in excess of 1200 MPa.

Geometry & Thread
The hexagonal drive head conforms to standard wrench opening dimensions. The smooth, non-serrated flange face prevents surface marking on coated or sensitive mating parts. Metric coarse pitch thread per ISO 724 accelerates power-tool installation and resists stripping in steel and aluminum substrates. Shank length is partially threaded as standard, with full-thread options available where grip length demands it.

Corrosion Protection
Electrodeposited zinc to ASTM B633 Fe/Zn 5–8 μm is the default finish, with supplementary passivation. For outdoor and aggressive industrial atmospheres (C3–C5 categories), zinc flake, hot-dip galvanized, or zinc-nickel alloy coatings are specified. All coatings are selected to remain below the hydrogen embrittlement threshold for the relevant property class.

Application Suitability
Motor vehicle engine and chassis assembly, pump and compressor housings, structural framing connections, and general mechanical engineering where a compact flange head bolt replaces a bolt-and-washer assembly. The non-serrated flange is particularly suited to joints where surface preservation and uniform clamp pressure are critical.

 

Technical Parameters

Place of Origin CHINA
Standard DIN6921 Hexagonal Flange Bolt
HS CODE 7318159001
Brand Name QBH
Certification ISO9001
Material 35K, 40Cr, 35CrMo, SCM435，etc.
Size M3-M64
Production Process Cold forging≤300mm,Hot forging≤1000mm
Class 4.8/ 6.8/ 8.8/ 10.9/ 12.9
Delivery Time Within 30Days

Product Introduction
Metric hexagonal flange bolts manufactured to DIN 6921 without serration under the bearing surface. The integrated flange increases the contact area and eliminates the need for a separate washer. Diameters M5 through M20 are stocked, with larger sizes available by order, across property classes 8.8, 10.9, and 12.9 per ISO 898-1. Surface treatments are applied in accordance with service environment requirements.

Material & Mechanical Properties
Produced from medium carbon alloy steel and quench-and-tempered to meet the proof load, tensile, and hardness values of the designated property class. Heat-number traceability is maintained through the manufacturing process, and certified test reports are issued upon request. Class 8.8 and 10.9 cover the majority of medium- and high-strength bolting applications; class 12.9 provides ultimate tensile strength in excess of 1200 MPa.

Geometry & Thread
The hexagonal drive head conforms to standard wrench opening dimensions. The smooth, non-serrated flange face prevents surface marking on coated or sensitive mating parts. Metric coarse pitch thread per ISO 724 accelerates power-tool installation and resists stripping in steel and aluminum substrates. Shank length is partially threaded as standard, with full-thread options available where grip length demands it.

Corrosion Protection
Electrodeposited zinc to ASTM B633 Fe/Zn 5–8 μm is the default finish, with supplementary passivation. For outdoor and aggressive industrial atmospheres (C3–C5 categories), zinc flake, hot-dip galvanized, or zinc-nickel alloy coatings are specified. All coatings are selected to remain below the hydrogen embrittlement threshold for the relevant property class.

Application Suitability
Motor vehicle engine and chassis assembly, pump and compressor housings, structural framing connections, and general mechanical engineering where a compact flange head bolt replaces a bolt-and-washer assembly. The non-serrated flange is particularly suited to joints where surface preservation and uniform clamp pressure are critical.

 

Technical Parameters

Place of Origin CHINA
Standard DIN6921 Hexagonal Flange Bolt
HS CODE 7318159001
Brand Name QBH
Certification ISO9001
Material 35K, 40Cr, 35CrMo, SCM435，etc.
Size M3-M64
Production Process Cold forging≤300mm,Hot forging≤1000mm
Class 4.8/ 6.8/ 8.8/ 10.9/ 12.9
Delivery Time Within 30Days
FAQ

1. How do you let me trust you.

Jiaxing City Qunbang Hardware Co.,ltd hs its own right of import and export,QBH trademark in China,United States,European Union have been registered.At the same time,you can also check the registration information of our company in the China industry and Commerce system.

 

2. How about your price.

We will be based on different markets,for different quality and quantity,tailor-made prices for customers,in order to achieve win-win goal.

 

3. How do you control your quality.

Incoming quality contral( IQC)→Process Quality control(PQC)→Output quality control(OQC),and the random samples is sent to TUV for testing.If the customer received the goods and found quality problems,QBH company promises to be responsible for returning money or replenishing the goods

 

4. Could you provide free samples?

For new customer, We can provide free samples for standard fastener, But the clients will pay the express

charges. For old customer, We will send you free samples and pay express charges by ourself.

 

5. What is your packing.

Usually 25KG/carbon,36CTNS on the pallets,or 20-30kg/Bags,then on the pallet,QBH company personalized packagingis also available,like 10PCS/plastic bag or 10pcs/box,it can print some information

such as LOGO and pattern of customers.

 

6. What is your payment term

Normally,our terms of payment are TT and L/C,if we cooperate for a long time,we can reach the point of mutual trust,and fully support our customers to become bigger and stronger in the local market.Not only in the price concessions,but also in the payment can also be made on credit,Specific credit sales time needs to be negotiated separately.

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