S-96177A140 1/4"-28 x 3/4" ASTM A276 Coupling Nuts
Coupling Nuts
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Basic Information
Dimension Parameters
Thread Parameters
Head Parameters
Material & Strength Parameters
Finish & Compliance Parameters
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Key Features & Benefits at a Glance
- Exceptional corrosion resistance with black-oxide steel construction, ideal for humid or harsh industrial environments
- Precise thread engagement ensured by Class 2B fit, reducing cross-threading risks and improving assembly reliability
- Full-threaded design provides maximum grip strength and uniform stress distribution across connected components
- Fine UNF threading (1/4"-28) delivers superior vibration resistance in dynamic applications compared to coarse threads
- Standard profile compatibility allows seamless integration with existing inch-system assemblies and tooling
- Regulatory compliance assurance with RoHS 3 and REACH standards, meeting global environmental requirements
- ASTM A276 material certification guarantees consistent mechanical properties and batch-to-batch reliability
Professional Applications & Engineering Value
This black-oxide steel coupling nut solves critical challenges in extended fastener applications where corrosion resistance and thread precision are paramount. The fully threaded UNF design maintains uniform clamping force across long joints, preventing stress concentration in hydraulic systems and precision machinery. Engineers specify the Class 2B thread fit for assemblies requiring repeated disassembly without galling, while the fine 1/4"-28 threading provides enhanced vibration resistance in automotive and aerospace components. The black-oxide surface treatment creates a protective barrier against oxidation without dimensional changes, making it ideal for electrical enclosures and outdoor equipment where moisture protection is critical.
Specification Summary & Compliance
Manufactured to ASTM A276 specifications with Class 2B thread tolerances for consistent mating with Class 2A external threads. Features UNF fine threading (1/4"-28) with right-hand direction and standard 23/64" OD dimensions. Fully compliant with RoHS 3 (2015/863/EU) under exemption 6(a) and REACH (EC 1907/2006) regulations regarding substance restrictions.
