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What is a DIN 964 A4 Stainless Slotted Oval Head Machine Screw?
DIN 964 machine screws are metric fasteners featuring a raised countersunk (oval head) with a slotted drive. The head combines a 90° countersunk underside with a gently rounded, domed top, allowing the screw to seat in a countersunk hole while leaving an attractive raised profile above the surface after installation.
This design provides the clean appearance of a countersunk fastener while creating a more decorative finished look than a standard flat head screw. Screw length is measured from the top of the head to the tip. DIN 964 screws are designed for use with tapped holes or metric machine thread nuts.
They are also known as slotted raised countersunk machine screws, slotted oval head machine screws, raised countersunk slotted screws, oval countersunk machine screws, and metric raised head machine screws.
What material is a DIN 964 A4 slotted machine screw made from?
DIN 964 screws are manufactured from A4 stainless steel (SAE Type 316 stainless steel), commonly referred to 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 demanding outdoor, marine, and chemical environments.
The natural stainless finish offers outstanding durability while maintaining a clean, professional appearance with minimal maintenance. The slotted drive offers compatibility with standard flat-blade tools while preserving the traditional appearance often desired for exposed fasteners.
Why choose an A4 stainless DIN 964 slotted machine screw?
A4 stainless DIN 964 screws combine outstanding corrosion resistance with the timeless appearance 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 raised countersunk (oval) head seats neatly in a countersunk hole while leaving a refined domed profile above the surface, making it ideal for visible installations requiring both appearance and durability. The slotted drive maintains the classic styling often specified for restoration projects, marine hardware, and architectural applications.
Where are DIN 964 A4 stainless slotted machine screws commonly used?
DIN 964 A4 stainless slotted raised countersunk (oval head) machine screws are widely used in marine equipment, boat building, coastal infrastructure, architectural metalwork, food processing machinery, pharmaceutical equipment, water treatment facilities, outdoor lighting, decorative hardware, restoration projects, transportation equipment, and chemical processing systems.
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