S-91903A039 1 1/4"-7 Hex Nuts

Key Features & Benefits at a Glance

• Enhanced load distribution with an extra wide hex profile (2" width) for superior grip and reduced surface pressure in heavy-duty assemblies.
• Exceptional corrosion resistance provided by the zinc-plated steel coating, extending service life in harsh industrial environments.
• High tensile strength and reliability from Grade 5 classification, ensuring dependable performance under significant stress and vibration.
• Quick and easy installation with coarse 1 1/4"-7 UNC threading and Class 2B fit, facilitating faster assembly and reducing cross-threading risks.
• Secure external hex drive compatibility for use with standard wrenches, offering straightforward tightening in confined spaces.
• Compliance with major environmental regulations including RoHS 3 and REACH, ensuring safe use in regulated industries and global markets.
• Robust durability in demanding applications due to the right-hand thread design and inch system standardization, ideal for machinery and structural projects.

Professional Applications & Engineering Value

This Grade 5 zinc-plated steel extra wide hex nut is engineered to address common industrial challenges such as joint failure and corrosion in heavy machinery, construction, and automotive sectors. The coarse UNC thread and Class 2B fit ensure rapid, secure fastening even in high-vibration environments, minimizing downtime. Its zinc plating offers a protective barrier against moisture and chemicals, while the extra wide profile distributes clamping force evenly, preventing loosening and enhancing structural integrity. Ideal for industrial fastening in equipment frames, pipelines, and structural supports, it delivers long-term reliability and compliance with international standards for safety and performance.

Specification Summary & Compliance

This hex nut features precise UNC coarse threading (1 1/4"-7) with a Class 2B thread fit for consistent engagement and tolerance. Manufactured from zinc-plated steel to Grade 5 strength, it meets rigorous industrial specifications. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and quality in global supply chains. Dimensions include a 2" width and 1 7/32" height for standardized use in inch-based systems.