S-91853A040 1 1/4"-7 Locknuts

Key Features & Benefits at a Glance

• Maximum security locking with cotter pin mechanism prevents accidental loosening under heavy vibration and dynamic loads
• Superior corrosion resistance from 18-8 stainless steel construction ensures long-term reliability in harsh industrial environments
• Precision UNC coarse threading with Class 2B fit provides smooth installation and reliable engagement with mating components
• Heavy-duty external hex design offers excellent torque transmission and tool accessibility for efficient installation
• Optimized slot dimensions (0.37" depth, 0.31" width) accommodate standard 7/32" cotter pins for secure locking
• Environmental compliance with RoHS 3 and REACH regulations ensures safe usage across regulated industries
• Robust dimensional profile (1 7/8" width, 1 1/4" height) delivers exceptional load distribution and structural integrity

Professional Applications & Engineering Value

This 1 1/4"-7 UNC locknut delivers critical engineering value in applications where vibration resistance and fail-safe fastening are paramount. The cotter pin locking mechanism provides positive mechanical locking that outperforms friction-based alternatives in high-vibration environments like heavy machinery, agricultural equipment, and transportation systems. Manufactured from 18-8 stainless steel, this external hex locknut maintains its corrosion-resistant properties while withstanding extreme operational stresses. The UNC coarse thread configuration ensures rapid assembly and disassembly while the Class 2B thread fit guarantees consistent performance across multiple installation cycles. This heavy-duty solution addresses the critical need for reliable, maintenance-free fastening in industrial settings where safety and durability cannot be compromised.

Specification Summary & Compliance

This locknut features precision 1 1/4"-7 UNC coarse threads with Class 2B thread fit for optimal engagement and dimensional accuracy. The right-hand thread direction and standard hex profile ensure compatibility with industry-standard tools and components. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming environmental responsibility and chemical safety. Critical dimensions include 1 7/8" width, 1 1/4" height, and cotter pin accommodation for 7/32" diameter pins with minimum slot depth of 0.37" and width of 0.31" for secure locking performance.