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What is a DIN 85 A4 Stainless Slotted Pan Head Machine Screw?
DIN 85 machine screws are metric fasteners featuring a pan head with a slotted drive. The pan head has a broad, slightly domed profile with a flat bearing surface underneath, providing excellent load distribution without requiring a countersunk hole.
The slotted drive offers a timeless appearance while remaining compatible with standard flat-blade screwdrivers, making these screws well suited for marine hardware, restoration projects, and architectural applications.
Screw length is measured from underneath the head to the tip. DIN 85 screws are designed for use with tapped holes or metric machine thread nuts. They are also known as slotted pan head machine screws, slotted round head machine screws, straight slot machine screws, and metric pan head screws.
What material is a DIN 85 A4 slotted machine screw made from?
DIN 85 screws are manufactured from A4 stainless steel (SAE Type 316 stainless steel), commonly known as marine-grade stainless steel. A4 stainless steel provides exceptional resistance to corrosion, saltwater, chlorides, moisture, and many industrial chemicals, making it the preferred material for harsh outdoor and marine environments.
The natural stainless finish offers outstanding durability while maintaining a clean, professional appearance with minimal maintenance. The slotted drive preserves the traditional appearance often specified for exposed fasteners while remaining compatible with standard installation tools.
Why choose an A4 stainless DIN 85 slotted machine screw?
A4 stainless DIN 85 screws combine exceptional corrosion resistance with the classic styling of a traditional slotted fastener. Compared to A2 stainless steel, A4 provides significantly greater resistance to saltwater, chlorides, and aggressive chemicals, making it the preferred material for coastal, marine, food processing, pharmaceutical, and chemical processing applications.
The pan head provides a broad bearing surface for secure clamping without requiring a countersunk hole, while the slotted drive offers an authentic appearance often desired for restoration work, marine fittings, and decorative hardware.
Where are DIN 85 A4 stainless slotted machine screws commonly used?
DIN 85 A4 stainless slotted pan head machine screws are widely used in marine equipment, boat building, dock hardware, coastal infrastructure, food processing machinery, pharmaceutical equipment, water treatment facilities, architectural metalwork, outdoor lighting, renewable energy systems, restoration projects, and chemical processing equipment.
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