S-90521A107 5/16"-18 ASTM A194 Hex Nuts

Key Features & Benefits at a Glance

• Exceptional load distribution thanks to the extra wide profile, reducing surface pressure and preventing material damage
• Superior strength and reliability with ASTM Grade 2H certification, ensuring high clamp load retention in demanding applications
• Quick and easy installation with coarse UNC threading and Class 2B fit, minimizing cross-threading risks and assembly time
• Enhanced durability and corrosion resistance from high-quality steel construction, extending service life in harsh industrial environments
• Industry-standard compliance with ASTM A194 specifications, guaranteeing consistent performance and interchangeability
• Environmental responsibility through RoHS 3 and REACH compliance, meeting strict international safety regulations
• Secure external hex drive providing excellent torque transmission and preventing tool slippage during tightening

Professional Applications & Engineering Value

This heavy-duty 5/16"-18 UNC hex nut delivers critical engineering solutions where vibration resistance and structural integrity are paramount. The extra wide profile distributes clamping force over a larger surface area, preventing joint loosening in machinery, construction equipment, and automotive assemblies. Manufactured from high-strength steel and meeting ASTM Grade 2H requirements, it maintains tension under extreme loads where standard nuts would fail. The coarse thread design with Class 2B fit ensures rapid installation in field maintenance while resisting vibration-induced slackening. This combination of dimensional precision and material excellence makes it ideal for structural connections, heavy equipment manufacturing, and industrial maintenance applications requiring reliable, long-lasting fastening solutions.

Specification Summary & Compliance

This hex nut features 5/16"-18 UNC coarse threading with Class 2B thread fit for standard industrial applications. Dimensions include 9/16" width and 19/64" height in the inch measurement system. Manufactured in compliance with ASTM A194 and ASTM Grade 2H specifications for heavy-duty performance. The product meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards, containing no restricted substances above threshold limits.