S-97190A130 7/16"-20 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through integrated cotter pin slot design, preventing loosening in high-stress environments
• Enhanced corrosion protection with zinc-plated steel construction, extending service life in harsh industrial conditions
• High-strength performance meeting Grade 5 specifications, ensuring reliable fastening under heavy loads
• Precision UNF fine threading (7/16"-20) with Class 2B fit for smooth installation and secure mating with male threads
• Quick visual safety verification enabled by standard external hex drive and cotter pin slot for easy inspection
• Compliance with international standards including REACH and RoHS 3, ensuring workplace safety and environmental responsibility
• Optimized slot dimensions (0.135" depth, 0.12" width) accommodating standard 7/64" cotter pins for reliable locking

Professional Applications & Engineering Value

This Grade 5 zinc-plated steel locknut delivers critical vibration resistance in demanding mechanical systems where safety is paramount. The integrated cotter pin slot provides positive mechanical locking that surpasses friction-based alternatives, making it ideal for heavy machinery, automotive suspensions, and industrial equipment subject to constant vibration and shock loads. The UNF fine thread configuration (7/16"-20) offers superior thread engagement compared to coarse threads, while the Class 2B thread fit ensures consistent installation torque and reliable performance. The zinc plating creates a protective barrier against corrosion, extending service life in outdoor or chemically aggressive environments where fastener integrity cannot be compromised.

Specification Summary & Compliance

This locknut features 7/16"-20 UNF fine threads with Class 2B thread fit tolerances per ASME standards, ensuring precise mating with corresponding male threads. The external hex drive (11/16" width) provides standard wrench engagement, while the 3/8" profile maintains a compact form factor. Manufacturing complies with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) directives, confirming adherence to environmental and safety regulations. The cotter pin slot is precision-machined to accommodate 7/64" diameter pins with minimum slot dimensions of 0.135" depth and 0.12" width for reliable locking performance.