S-94036A421 M8 x 20 mm ISO 898-1, DIN 6921 Medium-Strength Metric Class 8.8 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• High tensile strength of 110,000 psi ensures reliable performance in demanding industrial environments, reducing the risk of fastener failure.
• Zinc yellow-chromate plating provides excellent corrosion resistance, extending the service life of the screw in harsh or outdoor conditions.
• Class 8.8 strength grade offers superior durability and load-bearing capacity, ideal for heavy-duty applications requiring secure fastening.
• Flanged hex head design eliminates the need for a separate washer, simplifying installation and providing a larger bearing surface for improved stability.
• Partially threaded M8 coarse thread allows for precise clamping force control and faster assembly in materials like metal and thick plastics.
• External hex drive enables easy tightening with standard tools, reducing installation time and minimizing strip-out risks.
• Compliance with ISO 898-1 and DIN 6921 standards guarantees consistent quality, dimensional accuracy, and interoperability in global engineering projects.

Professional Applications & Engineering Value

This M8 hex head screw is engineered to address common industrial fastening challenges, such as vibration loosening and corrosion-induced degradation. The zinc yellow-chromate plated steel construction provides a robust barrier against moisture and chemicals, making it suitable for automotive assemblies, machinery frames, and construction equipment where environmental exposure is a concern. With a Class 8.8 strength rating and Rockwell C22 hardness, it maintains integrity under high-stress conditions, while the flanged design distributes load evenly to prevent surface damage. The partially threaded and coarse pitch configuration ensures quick engagement and reliable grip in thick materials, reducing assembly time and enhancing structural stability in heavy-duty applications.

Specification Summary & Compliance

This fastener features a Metric M8 x 1.25mm coarse thread with Class 6g thread fit for precise dimensional accuracy, and a length of 20 mm with a minimum thread length of 16 mm. It is manufactured in accordance with ISO 898-1 and DIN 6921 specifications, ensuring consistent performance and interchangeability. The product is REACH (EC 1907/2006) compliant, adhering to environmental and safety standards for hazardous substances, and is designed for reliable use in industrial settings requiring high tensile strength and corrosion resistance.