Metric Flange Bolts: DIN 6921, ISO 4162, JIS Standards Explained
Choosing the right metric flange bolts is essential for secure and efficient assembly in automotive, machinery, and industrial applications. These bolts feature an integrated flange that distributes load evenly and eliminates the need for separate washers, providing reliable clamping and vibration resistance.
As a professional flange bolt manufacturer, Xinchi is glad to introduce the differences among the DIN 6921, ISO 4162, and JIS standards, hoping this will help you select the proper fastener for each project.
flange bolts
DIN 6921 Metric Flange Bolts
DIN 6921 is a widely used European standard for metric flange bolts. These bolts have a wide, serrated flange that enhances grip and prevents loosening under vibration. They are commonly applied in engines, heavy machinery, and structural assemblies where stable load distribution is critical.
Made from high-strength steel, DIN 6921 bolts come in various diameters and thread lengths. The serrated flange helps protect surfaces while providing extra holding power, making these bolts suitable for applications requiring repeated assembly and disassembly.
Flange Bolts
ISO 4162 Metric Flange Bolts
ISO 4162 defines international specifications for metric flange bolts, ensuring global compatibility and consistent mechanical performance. While similar to DIN 6921, ISO 4162 bolts focus on interchangeability across countries and manufacturing systems.
These bolts are widely used in industrial machinery and equipment where standardized specifications simplify procurement and maintenance. ISO 4162 flange bolts deliver consistent torque and predictable clamping force, essential for reliable assembly in critical applications.
Flange Bolts
JIS Metric Flange Bolts
JIS (Japanese Industrial Standards) also defines metric flange bolts, primarily used in automotive and electronics applications in Japan and the Asia-Pacific region. Compared with DIN or ISO standards, JIS bolts may differ slightly in flange diameter, thread tolerance, and mechanical properties.
Selecting the correct JIS metric flange bolt is important for international projects, retrofitting, or sourcing replacement fasteners from different regions. JIS bolts maintain excellent vibration resistance and surface protection, making them suitable for high-precision assemblies.
Flange Bolts
How to Choose the Right Metric Flange Bolt
When selecting a metric flange bolt, consider:
- Required mechanical strength and material grade
- Surface protection and compatibility with washers
- Vibration and load conditions
- Applicable standard (DIN, ISO, or JIS)
Using bolts that meet the proper standard ensures reliability, reduces assembly errors, and minimizes maintenance needs.
Why Xinchi Fasteners Factory
Established in 2007, Xinchi Fasteners Factory specializes in high-quality metric flange bolts and industrial fasteners. With 102 cold heading machines and a daily output exceeding 10 million pieces, Xinchi combines large-scale production with precise quality control.
Xinchi Fastener Factory
The new factory spans 30,000 square meters and comprises two six-story buildings, supporting reliable manufacturing of DIN-, ISO-, and JIS-standard bolts. As a trusted fastener supplier, we can offer a wide range of high-quality fasteners, including nuts, screws, bolts, rivets, and washers. Xinchi is a trusted partner for engineers and procurement teams worldwide, delivering durable and standardized metric flange bolts for automotive, machinery, and industrial applications.