RS PRO Steel Hex Socket Countersunk Screw, M6 x 20 mm, DIN 7991, Grade 10.9 Black Finish 281-518

RS PRO 281-518 Steel Hex Socket Countersunk Screw, M6 x 20 mm is a high-performance fastener designed for industrial, mechanical, and commercial applications requiring precision and reliability. Its robust steel construction and high-grade black oxide finish ensure the screw resists corrosion and delivers lasting strength, especially in demanding environments.

The countersunk hex socket screw head allows the fastener to sit flush or below the surface of panels and materials, preventing interference and enhancing safety. With a metric M6 thread size, a standard 20 mm length, and a thread pitch of 1 mm, this screw conforms to DIN 7991 specifications for quality and interchangeability, making it compatible with a range of fixtures.

Manufactured to Grade 10.9, the screw offers nominal tensile strength of 1040 N/mm² and yield strength of 940 N/mm², exceeding the performance of standard 8.8 grade screws. The hex socket drive supports easy operation and secure tightening using common Allen keys, minimizing risk of cam-out or slippage during installation and removal.

This versatile fastener is suitable for machine assembly, repairs, electronic housings, security guarding, panel building, automotive and medical equipment, woodworking, and domestic maintenance. Its compact design is ideal for use in confined areas where protruding screw heads could impair function or aesthetics.

The attractive black finish provides an additional layer of protection and a professional look, making it suitable for visible fittings in high-quality engineering projects. The screw is compatible with other metric-threaded fasteners and sockets, supporting efficient maintenance and replacement.

Constructed from high-strength steel with a black self-colour finish for corrosion resistance. Features a hex socket countersunk head for flush fitting in panels and surfaces. Metric thread M6 with a 20 mm length and 1 mm pitch, compliant with DIN 7991 standard.

Grade 10.9 ensures superior strength and reliability compared to 8.8 grade screws. Easy installation and removal using a hex key or Allen key. Ideal for applications where space is limited and a flush screw head is required.

Commonly used in machine tooling, repair, panel building, woodworking and joinery. Attractive finish provides a professional appearance for industrial, automotive, and electronic assemblies.

Whether you're assembling machinery, repairing equipment, or constructing panels and furniture, the RS PRO countersunk hex socket screw delivers proven reliability across industrial, laboratory, electronic, and automotive sectors. Explore more fasteners and precision engineering solutions in the Socket Screws category and in the RS PRO range at EnvMart.