S-91875A140 5/16"-18 Cap Nuts

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in harsh industrial environments
• Reliable coarse thread engagement with UNC 5/16"-18 specification for faster assembly and reduced cross-threading risks
• Precise Class 2B thread fit ensuring consistent performance and compatibility with standard mating components
• External hex drive design providing secure tool grip and straightforward installation with common wrenches
• Complete end-thread protection through standard cap profile, preventing contamination and enhancing safety
• RoHS 3 compliance meeting environmental regulations for global industrial applications
• Optimized dimensions (1/2" width, 17/32" height) offering balanced strength-to-weight ratio for space-constrained assemblies

Professional Applications & Engineering Value

This zinc-plated steel cap nut delivers critical performance advantages in demanding industrial fastening scenarios. The UNC coarse thread configuration enables rapid installation while maintaining vibration resistance in machinery, automotive, and structural applications. The external hex drive combined with Class 2B thread fit ensures consistent torque transmission and reliable clamping force distribution. The zinc plating provides essential corrosion protection against moisture and chemical exposure, significantly reducing maintenance frequency in outdoor equipment and manufacturing environments. The enclosed cap design effectively seals thread ends against debris ingress while providing finished appearance for consumer-facing products.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2B thread fit ensuring proper clearance with mating UNC 5/16"-18 coarse threads. The nut features standard external hex drive configuration with 1/2" width across flats and 17/32" total height. Fully compliant with RoHS 3 (2015/863/EU) regulations under exemption 6(a)-I for lead as steel alloying element, meeting international environmental requirements for industrial components.