S-90202A203 1/4"-20 x 3/4" ASTM A582 Coupling Nuts

Coupling Nuts

0991FA00021 Coupling Nuts
0991FA00021 Coupling Nuts

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

Part No.
Part No. 0991FA00021
Equivalent to mcmaster :
90202A203

Basic Information

System of Measurement Inch
Nut Type Coupling
Specifications Met ASTM A582

Dimension Parameters

Length 3/4"
OD 23/64"

Thread Parameters

Thread Type UNC
Thread Size 1/4"-20
Threading Fully Threaded
Thread Direction Right Hand
Thread Spacing Coarse
Thread Fit Class 2B

Head Parameters

Coupling Nut Profile Standard

Material & Strength Parameters

Material 18-8 Stainless Steel

Finish & Compliance Parameters

RoHS RoHS 3 (2015/863/EU) Compliant
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 from 18-8 Stainless Steel construction, ensuring long-term reliability in harsh environments.
  • Precise and reliable thread engagement with Class 2B thread fit, reducing the risk of cross-threading and assembly errors.
  • Robust coarse UNC threading (1/4"-20) allows for faster assembly and disassembly, boosting productivity.
  • Full threading along the entire 3/4" length provides maximum grip and uniform stress distribution in coupled assemblies.
  • Compliance with ASTM A582 specifications guarantees material quality and performance consistency for industrial use.
  • Environmental regulation adherence with RoHS 3 and REACH compliance, making it suitable for regulated global markets.
  • Standard right-hand threading ensures compatibility with common components, simplifying inventory and usage.

Professional Applications & Engineering Value

This 1/4"-20 UNC coupling nut is engineered to solve critical challenges in industrial assembly, where corrosion resistance and thread integrity are paramount. Manufactured from 18-8 Stainless Steel, it effectively resists rust and chemical degradation, making it ideal for applications in marine, chemical processing, and outdoor equipment. The fully threaded design and Class 2B thread fit ensure a secure, vibration-resistant connection between threaded rods or studs, minimizing loosening under dynamic loads. Its coarse thread profile facilitates quick installation, reducing labor time in high-volume production environments. By meeting ASTM A582 standards, this nut delivers consistent mechanical properties, providing engineers with a dependable solution for extending and joining components in frameworks, machinery, and structural supports.

Specification Summary & Compliance

This coupling nut features a 1/4"-20 UNC coarse thread with a Class 2B thread fit, ensuring dimensional accuracy and smooth assembly. It complies with the ASTM A582 specification for material and manufacturing standards. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to environmental and safety regulations for hazardous substances. Key dimensions include an OD of 23/64" and a length of 3/4".

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