S-98858A640 3/8"-16 Cap Nuts

Key Features & Benefits at a Glance

• Superior corrosion resistance with black protective coating, extending service life in harsh industrial environments
• High-strength Grade 5 steel construction provides reliable load-bearing capacity for demanding applications
• Coarse UNC threading (3/8"-16) ensures quick installation and reduced cross-threading risks
• Class 2B thread fit delivers consistent engagement and vibration resistance
• External hex drive design enables secure tool grip and torque application
• RoHS 3 compliance meets environmental regulations while maintaining mechanical performance
• Standard cap nut profile offers both aesthetic finish and finger protection

Professional Applications & Engineering Value

This Grade 5 black corrosion-resistant steel cap nut addresses critical industrial fastening challenges where both mechanical strength and environmental durability are paramount. The UNC coarse thread (3/8"-16) with Class 2B fit provides excellent engagement in high-vibration applications, preventing loosening in machinery, structural assemblies, and heavy equipment. The external hex drive allows for high-torque installation using standard tools, while the black corrosion-resistant coating protects against rust and chemical exposure in manufacturing plants, outdoor installations, and marine environments. Engineered for industrial cap nut applications, this fastener combines reliable performance with regulatory compliance, making it ideal for OEM production and maintenance operations requiring heavy-duty fasteners that withstand demanding conditions.

Specification Summary & Compliance

This cap nut features precision UNC 3/8"-16 coarse threading with Class 2B thread fit for consistent engagement. Manufactured from Grade 5 steel with dimensions of 9/16" width and 5/8" height. Compliant with RoHS 3 (2015/863/EU) standards under exemption 6(a) for lead as an alloying element in steel. The right-hand thread direction and external hex drive conform to industrial fastening specifications for reliable performance in professional applications.