S-97135A413 2 1/4"-8 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance with nylon insert locking that maintains secure fastening under dynamic loads
• High-temperature durability with nylon insert rated for continuous service up to 220°F (104°C)
• Exceptional corrosion protection through zinc yellow-chromate plating for extended service life in harsh environments
• Heavy-duty performance with Grade 8 strength classification for demanding industrial applications
• Precise thread engagement with Class 2B thread fit ensuring reliable installation and consistent clamping force
• Easy installation and removal with standard external hex drive design compatible with common tools
• Optimized for coarse threading with 2 1/4"-8 UNC threads providing quick assembly and disassembly

Professional Applications & Engineering Value

This Grade 8 heavy-duty nylon insert locknut delivers critical vibration resistance in demanding mechanical systems where loosening under dynamic loads poses significant safety and performance risks. The zinc yellow-chromate plated steel construction provides superior corrosion protection for outdoor equipment, industrial machinery, and transportation applications exposed to harsh environmental conditions. With its 2 1/4"-8 UNC coarse thread configuration and Class 2B thread fit, this external hex locknut ensures precise engagement and reliable performance in heavy equipment, structural assemblies, and high-vibration environments. The nylon insert maintains consistent locking force up to 220°F maximum temperature, making it ideal for engines, powertrains, and industrial machinery operating under thermal cycling conditions.

Specification Summary & Compliance

This locknut features 2 1/4"-8 UNC coarse threads with Class 2B thread fit for precision engagement, manufactured from zinc yellow-chromate plated steel with Grade 8 strength classification. The external hex drive design complies with standard wrenching requirements, while the right-hand thread direction follows conventional fastening practices. The nylon insert locking mechanism is engineered to maintain performance within the specified 220°F maximum temperature range, ensuring reliable operation in various industrial environments.