S-97149A120 1/4"-28 Hex Nuts

Key Features & Benefits at a Glance

• Superior corrosion resistance from Black-Oxide coated 18-8 Stainless Steel, ideal for harsh industrial environments
• Precise fine thread engagement with 1/4"-28 UNF threading for secure, vibration-resistant connections
• Reliable thread fit through Class 2B tolerance ensuring consistent assembly and reduced cross-threading risks
• Easy installation and removal with standard external hex drive design using common wrench tools
• Environmental compliance meeting RoHS 3 and REACH standards for safe, regulated industrial use
• Durable construction maintaining structural integrity under repeated torque applications
• Right-hand threading compatibility for standard clockwise tightening in standard machinery and equipment

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 1/4"-28 UNF hex nuts with Black-Oxide 18-8 Stainless Steel construction provide exceptional corrosion resistance in moisture-rich or chemically aggressive environments. The fine thread spacing and Class 2B thread fit deliver superior vibration resistance and clamping force retention in precision assemblies, automotive systems, and machinery where loosening under dynamic loads is a critical concern. The external hex drive profile ensures compatibility with standard tools while the right-hand thread direction maintains installation consistency across industrial equipment. These nuts solve common fastening challenges by combining chemical resistance with mechanical reliability in UNF thread applications requiring fine-pitch precision.

Specification Summary & Compliance

This standard hex nut features precise 1/4"-28 UNF fine threads with Class 2B thread fit tolerance per UNF standards, ensuring consistent engagement with mating components. Dimensions include 7/16" width across flats and 7/32" height. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming environmental safety and restricted substance compliance for industrial fastener applications.