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What is a DIN 6921 A4-80 Hex Flange Bolt?
A DIN 6921 hex flange bolt is a metric fastener featuring a hexagonal head with an integrated smooth flange. The built-in flange acts as a washer, distributing clamping force over a larger surface area and often eliminating the need for a separate flat washer. These non-serrated flange bolts can be used with locking nuts, non-locking nuts, or in tapped holes, making them a versatile fastening solution for mechanical, structural, and industrial applications. DIN 6921 flange bolts are also commonly referred to as hex flange bolts, hex flange screws, external hex flange bolts, integral washer bolts, one-piece flange bolts, metric flange head bolts, and hex washer head bolts.
What material is an A4-80 flange bolt made from?
DIN 6921 A4-80 flange bolts are manufactured from A4 stainless steel (SAE Type 316 stainless steel), often referred to as marine-grade stainless steel. A4 stainless steel offers excellent resistance to corrosion, saltwater, moisture, and many chemicals, making it suitable for demanding outdoor and corrosive environments. The natural stainless finish provides long-term protection against rust while maintaining a clean, professional appearance.
What does the A4-80 designation mean and why choose it over A4-70?
The A4-80 designation, as defined by DIN EN ISO 3506, indicates an austenitic stainless steel fastener with a minimum tensile strength of 800 N/mm². Compared to A4-70 stainless steel, which has a minimum tensile strength of 700 N/mm², A4-80 provides approximately 14% higher tensile strength and greater load-carrying capability. Engineers and maintenance professionals often choose A4-80 flange bolts when they require the corrosion resistance of 316 stainless steel combined with higher clamping force, improved preload retention, and increased mechanical strength.
Where are A4-80 DIN 6921 flange bolts commonly used?
A4-80 stainless steel flange bolts are widely used in marine equipment, offshore installations, food processing machinery, chemical processing plants, water treatment systems, renewable energy projects, agricultural equipment, transportation applications, industrial machinery, and outdoor structural assemblies. Their combination of high-strength A4-80 stainless steel, marine-grade corrosion resistance, and integrated flange design makes them ideal for applications exposed to moisture, salt spray, chemicals, vibration, and demanding environmental conditions.
