S-90631A121 M18 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through the nylon insert that maintains locking force even under dynamic loads
• Reliable performance in high-temperature environments with nylon insert rated for temperatures up to 220°F
• Enhanced corrosion protection provided by zinc-plated steel construction for extended service life
• Precision thread engagement with Class 6H thread fit ensuring consistent installation and removal
• Quick installation and removal using standard tools thanks to the external hex drive design
• Secure fastening in demanding applications with coarse metric threading providing excellent holding power
• Compliance with international standards including REACH and RoHS 3 for global industrial use

Professional Applications & Engineering Value

This M18 nylon insert lock nut delivers critical vibration resistance in industrial machinery, automotive assemblies, and construction equipment where coarse metric threading ensures rapid installation and reliable performance. The zinc-plated steel construction provides essential corrosion protection for outdoor and harsh environment applications, while the nylon insert locking mechanism maintains clamping force without damaging mating threads. Engineered with Class 6H thread fit, this locknut prevents loosening under continuous vibration and thermal cycling up to 220°F, making it ideal for motor mounts, conveyor systems, and heavy equipment where vibration-resistant fastening is paramount for operational safety and reduced maintenance intervals.

Specification Summary & Compliance

This M18 x 2.5mm locknut features precision Class 6H thread fit according to metric standards with coarse thread spacing. The external hex drive (27mm width, 18.5mm height) ensures compatibility with standard tools. Manufacturing complies with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental directives, confirming the absence of restricted substances for industrial applications worldwide.