S-90519A040 1 1/4"-7 Hex Nuts

Key Features & Benefits at a Glance

• Left-hand thread design provides secure fastening in applications where standard right-hand threads may loosen due to rotational forces
• Grade 2 steel construction offers excellent strength-to-weight ratio and reliable performance in general industrial applications
• UNC coarse threading enables faster assembly and reduced cross-threading risk compared to fine thread alternatives
• Class 2B thread fit ensures consistent engagement and optimal clearance for smooth installation with mating components
• Standard hex profile allows for easy installation and removal using common wrench tools without special equipment
• RoHS 3 and REACH compliance guarantees environmental responsibility and workplace safety in regulated industries
• Heavy-duty dimensions (1 7/8" width × 1 1/16" height) provide substantial bearing surface for distributing load effectively

Professional Applications & Engineering Value

This left hand thread hex nut solves critical engineering challenges in applications where counter-rotational forces are present. The Grade 2 steel construction delivers dependable strength for machinery, equipment maintenance, and structural assemblies where vibration-induced loosening is a concern. The UNC coarse thread pattern with Class 2B fit ensures reliable performance in high-vibration environments while maintaining installation efficiency. Particularly valuable for industrial machinery, automotive systems, and rotating equipment, this external hex drive nut provides secure fastening where standard right-hand threads would naturally unscrew. The combination of left hand threading and robust steel material creates an essential component for safety-critical applications requiring anti-rotation protection.

Specification Summary & Compliance

This hex nut features precise 1 1/4"-7 UNC coarse threading with Class 2B thread fit per ASME/ANSI standards, ensuring dimensional accuracy and proper clearance. Manufactured from Grade 2 steel with standard external hex drive profile measuring 1 7/8" across flats and 1 1/16" in height. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting current environmental and safety standards for industrial fasteners.