S-91034A120 1/2"-13 x 1 1/4" Coupling Nuts

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide steel finish for extended service life in harsh industrial environments
• Maximum thread engagement through fully threaded design ensures secure, vibration-resistant connections
• Precise thread compatibility with Class 2B fit guarantees smooth assembly and reliable performance
• Easy installation and removal with external hex drive design for standard wrench compatibility
• Heavy-duty load capacity from coarse UNC threads providing excellent tensile strength
• Environmental compliance meeting RoHS 3 and REACH standards for safe industrial use
• Standardized dimensions (1-1/4" length, 7/8" width) ensure interchangeability and easy replacement

Professional Applications & Engineering Value

This black-oxide steel coupling nut delivers exceptional engineering value in demanding industrial applications where extended thread engagement is critical. The fully threaded UNC coarse thread design provides maximum surface contact between mating components, effectively distributing stress loads and preventing loosening under vibration. The external hex drive configuration allows for high-torque installation using standard tools, while the black-oxide coating creates a protective barrier against corrosion in outdoor or chemically aggressive environments. Ideal for connecting threaded rods, extending studs, or joining components in construction, machinery, and heavy equipment assemblies, this coupling nut solves common challenges of alignment, strength retention, and long-term durability in inch-system applications.

Specification Summary & Compliance

This coupling nut features 1/2"-13 UNC coarse threads with Class 2B thread fit precision, ensuring proper clearance and engagement with mating Class 2A external threads. Manufactured to standard inch system dimensions with a length of 1-1/4" and width of 7/8", the nut maintains consistent performance across industrial applications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting current environmental standards for hazardous substance restrictions.