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ASME B18.2.2-2022

Nuts for General Applications: Machine Screw Nuts, and Hex, Square, Hex Flange, and Coupling Nuts (Inch Series)
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ASME B18.2.2-2022

Nuts for General Applications: Machine Screw Nuts, and Hex, Square, Hex Flange, and Coupling Nuts (Inch Series)

PUBLISH DATE 2022
PAGES 209
ASME B18.2.2-2022

Purpose of ASME B18.2.2-2022

ASME B18.2.2-2022, titled Unified Inch Screw Threads (UN and UNR Thread Form), is a standard developed and published by the American Society of Mechanical Engineers (ASME). Its primary purpose is to define the dimensions, tolerances, and specifications for nuts used with inch-based threaded fasteners, such as machine screws, bolts, and studs. The standard ensures interoperability, strength, and reliability of nut and bolt assemblies in mechanical and structural applications by providing standardized designs for various nut types, including hex, square, and heavy hex nuts. It aims to promote safety, consistency, and compatibility in fastening systems, reducing risks of thread mismatch, stripping, or failure under load.

Typical Use

ASME B18.2.2-2022 is typically applied in the design, manufacturing, and assembly of mechanical and structural systems across industries such as construction, automotive, aerospace, and manufacturing. Common applications include:

  • Structural assemblies: Securing steel frameworks in buildings, bridges, or infrastructure projects.
  • Machinery and equipment: Fastening components in industrial machines, engines, or heavy equipment.
  • Automotive systems: Joining parts in vehicle chassis, engines, or suspension systems.
  • General-purpose fastening: Used in consumer products, appliances, or maintenance applications requiring standardized nuts.

Engineers, manufacturers, and quality control professionals use the standard during project phases to:

  • Select appropriate nut types and sizes (e.g., hex, heavy hex, or jam nuts) based on thread series, material, and application requirements.
  • Ensure dimensional accuracy for nut width, thickness, and thread engagement to match corresponding bolts or screws.
  • Specify material and finish requirements, such as steel, stainless steel, or coatings, to meet strength and corrosion resistance needs.
  • Perform quality control and inspection to verify compliance with tolerances and thread fit, often using gauges or testing methods outlined in related standards like ASME B1.1.

The standard is often used alongside other ASME B18 series standards (e.g., B18.2.1 for bolts) and is referenced in engineering drawings, procurement specifications, and industry codes to ensure compatibility and performance. The 2022 edition includes updates such as revised dimensional tolerances, clarified thread specifications, and alignment with modern manufacturing practices, reflecting advancements in fastener technology and quality control.

SDO ASME: American Society of Mechanical Engineers
Document Number B18.2.2
Publication Date Jan. 1, 2022
Language en - English
Page Count 209
Revision Level
Supercedes
Committee
Publish Date Document Id Type View
Jan. 1, 2022 ASME B18.2.2-2022 Revision