S-91694A340 1 1/4"-7 ASTM A563 Hex Nuts

Key Features & Benefits at a Glance

• Superior corrosion protection through hot-dipped galvanized steel coating, extending service life in harsh environments
• Exceptional load-bearing capacity with ASTM Grade DH strength rating for heavy-duty applications
• Enhanced wrench grip and torque transmission from the extra wide 2" hex profile
• Reliable thread engagement with Class 2B thread fit ensuring consistent performance
• Quick installation efficiency using coarse UNC threads and standard external hex drive
• Industry compliance assurance meeting ASTM A563 specifications and RoHS 3 environmental standards
• Dimensional stability with precise 1-7/32" height maintaining structural integrity under stress

Professional Applications & Engineering Value

This heavy-duty hex nut delivers critical performance where structural integrity and corrosion resistance are paramount. The hot-dipped galvanized steel construction provides a sacrificial zinc barrier that protects against rust and degradation in outdoor, marine, and industrial environments. The extra wide profile (2" across flats) distributes clamping force more effectively, reducing stress concentration and preventing deformation in high-vibration applications. With ASTM Grade DH mechanical properties and coarse UNC threads, these nuts maintain secure fastening in structural steel, heavy machinery, bridge construction, and transportation equipment where right-hand threading and quick assembly are essential.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2B thread fit tolerance for reliable engagement with mating components. Thread specifications include 1-1/4"-7 UNC coarse thread configuration with right-hand direction. Complies with ASTM A563 manufacturing standards for hex nuts and carries ASTM Grade DH strength classification. Meets RoHS 3 (2015/863/EU) compliance for restricted hazardous substances. Dimensions: 2" width across flats, 1-7/32" height.