S-90475A035 5/8"-18 Hex Nuts

Key Features & Benefits at a Glance

• Enhanced corrosion protection with black-oxide steel finish, ideal for humid or demanding industrial environments
• Space-saving thin profile (1/4" height) allows for installation in tight clearance applications without compromising strength
• Precise Class 2B thread fit ensures smooth assembly and reliable, vibration-resistant connections
• Fine UNF thread spacing (18 TPI) provides superior load distribution and improved fatigue resistance
• Standard 1 1/16" hex width offers compatibility with common wrenches for efficient installation and maintenance
• Right-hand external hex drive enables quick, tool-friendly fastening in high-volume assembly operations
• Full regulatory compliance with RoHS 3 and REACH standards for safe use in regulated industries

Professional Applications & Engineering Value

This 5/8"-18 UNF thin hex nut delivers critical performance advantages in precision assemblies where space constraints and corrosion resistance are paramount. The black-oxide steel construction provides a durable barrier against oxidation and chemical exposure, extending service life in automotive, machinery, and outdoor equipment applications. The fine thread spacing and Class 2B thread fit work synergistically to prevent loosening under vibration while maintaining consistent clamping force. Engineered for heavy-duty fastening systems, this component solves common challenges of thread galling and premature failure, making it particularly valuable for maintenance-critical installations where reliability cannot be compromised.

Specification Summary & Compliance

Manufactured to UNF thread standards with Class 2B thread fit tolerances ensuring consistent mating with Class 2A external threads. Dimensions include 5/8"-18 thread size, 1 1/16" width across flats, and 1/4" height. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting the latest environmental and safety standards for industrial components.