S-97135A415 1/4"-28 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through nylon insert locking mechanism, preventing loosening in high-motion applications
• Exceptional strength and durability with Grade 8 classification, suitable for heavy-duty industrial use
• Reliable high-temperature performance maintaining locking integrity up to 220°F (104°C)
• Precise thread engagement with UNF fine threading and Class 2B fit for secure fastening
• Enhanced corrosion protection from black-oxide steel finish in demanding environments
• Easy installation and removal using standard 7/16" external hex drive with common tools
• Compliance assurance meeting REACH and RoHS 3 environmental standards for global applications

Professional Applications & Engineering Value

This Grade 8 nylon insert locknut delivers critical vibration resistance where traditional fasteners fail. The nylon locking element creates consistent friction against mating threads, maintaining clamp load in high-vibration environments like machinery, automotive assemblies, and industrial equipment. The black-oxide steel construction provides corrosion resistance while the UNF fine threading with Class 2B fit ensures precise engagement and reliable performance. Engineered for applications requiring repeated disassembly, this external hex locknut withstands temperatures to 220°F, making it ideal for engine compartments, manufacturing equipment, and transportation systems where thermal cycling and vibration are constant challenges.

Specification Summary & Compliance

This locknut features precision 1/4"-28 UNF fine threading with Class 2B thread fit per ASME standards, ensuring consistent engagement and reliable performance. The 7/16" hex width and 5/16" height provide standard tool compatibility. Manufactured to Grade 8 strength requirements with right-hand thread direction. Fully compliant with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental regulations for industrial applications worldwide.