S-91270A270 M4 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through the integrated spring lock washer that maintains consistent clamping force under dynamic loads
• Enhanced corrosion protection with black-oxide steel coating for extended service life in harsh industrial environments
• High-strength Class 8 rating ensures reliable performance in demanding applications requiring robust fastening solutions
• Secure locking mechanism prevents loosening from machinery vibrations and thermal cycling
• Precision metric coarse threading (M4 x 0.7mm) enables quick installation and optimal engagement with compatible bolts
• Standard hex profile allows for easy installation using common wrench tools in confined spaces
• Full regulatory compliance with RoHS 3 and REACH standards for safe use across various industries

Professional Applications & Engineering Value

This Class 8 steel locknut with integrated spring washer delivers exceptional engineering value in applications where vibration-induced loosening poses significant reliability concerns. The black-oxide coating provides critical corrosion resistance for automotive assemblies, industrial machinery, and outdoor equipment exposed to environmental elements. The metric coarse thread (M4 x 0.7mm) ensures rapid installation while maintaining Class 6H thread fit precision for consistent performance. The combination of external hex drive and spring lock washer creates a dual-security system that maintains clamping force through thermal expansion cycles and mechanical vibrations, making it ideal for engine components, conveyor systems, and heavy equipment where fastener failure is not an option.

Specification Summary & Compliance

This metric hex locknut features M4 x 0.7mm coarse threading with Class 6H thread fit tolerance, ensuring precise engagement with matching bolts. The 7mm width across flats and 4.2mm height provide standard dimensional compatibility, while the integrated steel spring washer offers a 10mm outer diameter for optimal load distribution. Manufactured to Class 8 strength rating specifications, this fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, guaranteeing safe use across industrial and automotive applications.