Heavy Series Flange Design
A larger flange surface provides better load distribution and higher joint stability for heavy-duty fastening applications.
EN 1665 heavy series hexagon Flange bolts
- Standard: EN 1665
- Material: Stainless Steel
- Thread Size: M5-M20
- Surface Treatment: Plain, Zinc Plated
- Min Order: 5000pcs
- Sample: Free sample (after quote)
- Delivery time: 30 – 45 Days
Product Overview
Product Application
EN 1665 is a European standard for fasteners, specifically designating hexagon bolts with a flange—heavy series. Compared to the common DIN 6921 or metric “small series” flange bolts, EN 1665 bolts feature a larger width across flats (a larger hex head) and a greater head height. They are designed for applications involving high loads, heavy machinery, and high-strength structural connections, effectively distributing pressure and protecting the workpiece surface without the need for additional flat washers.
Draw
Specification
EN 1665 Flange Bolt vs DIN 6921 Flange Bolt
EN 1665 Flange Bolt
- Heavy series design with larger flange diameter for higher load distribution.
- Designed for heavy-duty applications requiring stronger joint stability.
- Suitable for automotive, machinery and high-load fastening systems.
- Provides better surface protection and reduced risk of material deformation.
DIN 6921 Flange Bolt
- Standard series flange bolt widely used for general industrial fastening.
- More compact design with broad application compatibility.
- Suitable for machinery, equipment assembly and general engineering applications.
- Offers a cost-effective solution for standard fastening requirements.
Key Difference:
EN 1665 features a heavier flange design and higher bearing capacity, while DIN 6921 is a general-purpose flange bolt with wider everyday applications.
Product Advantages
High Strength Performance
Available in 8.8, 10.9 and stainless steel grades, delivering reliable strength and durability under demanding conditions.
Integrated Washer Function
The built-in flange combines bolt and washer functions, enabling faster assembly and reduced component costs.
Common Questions
What is EN 1665 flange bolt?
EN 1665 is a European standard for heavy series hexagon flange bolts with integrated flange heads, designed for reliable mechanical fastening applications.
What is the difference between EN 1665 and DIN 6921?
EN 1665 focuses on heavy series flange bolts with larger bearing performance, while DIN 6921 is commonly used for standard hex flange bolts.
What surface treatments are available?
Common finishes include:
- Zinc plating
- Zinc flake coating
- Black oxide
- Passivation
Do you provide OEM manufacturing?
Yes. We support OEM production, including custom dimensions, materials, coatings, and packaging.
