S-98858A570 5/16"-18 Cap Nuts

Key Features & Benefits at a Glance

• Superior corrosion protection with black coating to extend service life in harsh industrial environments
• High-strength Grade 5 construction delivers reliable performance under heavy loads and vibration
• Optimized UNC coarse threading (5/16"-18) enables faster installation and reduced cross-threading risk
• Precision Class 2B thread fit ensures smooth engagement and consistent clamping force
• External hex drive design provides secure tool grip for efficient tightening in confined spaces
• RoHS 3 compliance meets environmental regulations for industrial applications
• Standard 1/2" width offers compatibility with common wrenches and installation tools

Professional Applications & Engineering Value

This Grade 5 black corrosion-resistant cap nut addresses critical challenges in industrial fastening where both strength and environmental durability are paramount. The UNC coarse thread configuration (5/16"-18) combined with Class 2B thread fit ensures rapid assembly while maintaining vibration resistance in heavy machinery, construction equipment, and automotive applications. The external hex drive facilitates secure tool engagement even in hard-to-reach areas, while the corrosion-resistant coated steel construction protects against degradation in outdoor or chemically aggressive environments. These cap nuts provide engineered solutions for applications requiring both mechanical reliability and long-term corrosion protection in demanding industrial settings.

Specification Summary & Compliance

Manufactured to precise dimensional standards with 1/2" width and 17/32" height, featuring UNC coarse threads (5/16"-18) with Class 2B thread fit tolerance. Constructed from Grade 5 steel with black corrosion-resistant coating. Compliant with RoHS 3 (2015/863/EU) standards under exemption 6(a) for lead as an alloying element in steel. Right-hand thread direction with external hex drive configuration for standard tool compatibility.