S-91280A221 M5 x 6 mm ISO 4017, DIN 933, ISO 898 Medium-Strength Metric Class 8.8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc plating, extending service life in demanding industrial environments.
• High tensile strength of 110,000 psi ensures reliable performance under heavy loads and vibration.
• Class 8.8 strength grade provides a robust and dependable fastening solution for critical applications.
• Coarse thread pitch (0.8mm) allows for quicker installation and reduced risk of cross-threading.
• Fully threaded design offers maximum grip and holding power along the entire shank length.
• External hex drive and hex head enable easy installation and removal with standard tools.
• Compliance with ISO 4017/DIN 933 standards guarantees dimensional accuracy and interchangeability.

Professional Applications & Engineering Value

Engineered for demanding industrial applications, this M5 hex head screw addresses common engineering challenges such as joint failure and corrosion. The Class 8.8 steel construction, combined with a Rockwell C21 hardness, ensures the fastener can withstand high stress and repetitive loads without deforming. The coarse metric thread (M5 x 0.8mm) is ideal for quick assembly in materials like steel and aluminum, reducing installation time while maintaining a secure fit. The zinc plating provides a protective barrier against rust and oxidation, making these fully threaded screws suitable for machinery, automotive assemblies, and structural frameworks where heavy-duty fastening and long-term reliability are paramount.

Specification Summary & Compliance

This screw features a Class 6h thread fit for precise engagement and is manufactured to ISO 4017 and DIN 933 specifications, ensuring consistent dimensions and performance. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental standards for global use.