S-96177A370 3/8"-24 x 1 1/4" ASTM A108 Coupling Nuts

Coupling Nuts

0991FA00106 Coupling Nuts
0991FA00106 Coupling Nuts

Image may differ from product. See technical specification for details.

Part No.
Part No. 0991FA00106
Equivalent to mcmaster :
96177A370

Basic Information

System of Measurement Inch
Nut Type Coupling
Specifications Met ASTM A108

Dimension Parameters

Length 1 1/4"
OD 31/64"

Thread Parameters

Thread Type UNF
Thread Size 3/8"-24
Threading Fully Threaded
Thread Direction Right Hand
Thread Spacing Fine
Thread Fit Class 2B

Head Parameters

Coupling Nut Profile Standard

Material & Strength Parameters

Material Black-Oxide Steel

Finish & Compliance Parameters

RoHS RoHS 3 (2015/863/EU) compliant with exemption 6(a) - Lead as an alloying element in steel
REACH REACH (EC 1907/2006) (01/17/2023, 233 SVHC) Compliant
Technical Drawings No drawings available at the moment, will be launched soon
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Key Features & Benefits at a Glance

  • Superior corrosion resistance with black-oxide steel construction for extended service life in demanding industrial environments
  • Precision thread engagement with Class 2B thread fit ensuring reliable connections and reduced risk of cross-threading
  • Full-length threading provides maximum engagement surface for enhanced load distribution and joint integrity
  • Fine UNF thread profile (3/8"-24) delivers superior vibration resistance and precise adjustment capabilities
  • Standardized dimensions (31/64" OD, 1 1/4" length) ensure compatibility with existing assembly systems and tooling
  • Comprehensive compliance with ASTM A108 material specifications for consistent mechanical performance
  • Environmental responsibility through RoHS 3 and REACH compliance meeting global regulatory requirements

Professional Applications & Engineering Value

This black-oxide steel coupling nut addresses critical engineering challenges in industrial assembly where corrosion resistance and thread reliability are paramount. The fully threaded UNF design with Class 2B thread fit provides exceptional vibration resistance in dynamic applications such as machinery linkages, precision equipment, and automotive systems. The black-oxide surface treatment creates a protective barrier against oxidation while maintaining dimensional stability. Engineered to ASTM A108 standards, this 3/8"-24 coupling nut delivers consistent performance in high-stress applications where fine thread precision and reliable coupling solutions are essential for maintaining operational integrity and reducing maintenance frequency.

Specification Summary & Compliance

This coupling nut features Class 2B thread fit per UNF standards with precise 3/8"-24 fine threading and right-hand direction. Manufactured from black-oxide steel meeting ASTM A108 specifications with dimensions of 31/64" OD and 1 1/4" length. The product is fully compliant with RoHS 3 (2015/863/EU) under exemption 6(a) for lead as an alloying element in steel and REACH (EC 1907/2006) regulations current as of January 17, 2023, covering 233 SVHC substances.

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