ASME B1.1-2024

ASME B1.1 – 2024 Edition – Unified Inch Screw Threads (UN, UNR, and UNJ Thread Forms)

ASME B1.1-2024 is a standard issued by the American Society of Mechanical Engineers (ASME) that covers the unified inch screw threads, providing specifications and guidelines for the design, production, and inspection of screw threads. This standard is an update from previous editions and incorporates the latest advancements in screw thread technology and industry practices.

Key Highlights of ASME B1.1-2024:

1. Unified Inch Screw Threads: The standard specifies the dimensions, tolerances, and requirements for unified inch screw threads, including both external (bolt) and internal (nut) threads. It ensures compatibility and interchangeability of screw threads produced by different manufacturers.
2. Thread Classes: ASME B1.1-2024 defines various thread classes, such as Class 1A, 2A, and 3A for external threads, and Class 1B, 2B, and 3B for internal threads. Each class has different tolerance levels, with Class 1 having the loosest tolerances and Class 3 having the tightest, providing options for different applications based on the required precision and fit.
3. Thread Forms: The standard describes the basic thread form, including the shape and dimensions of the thread profile. It covers the thread angle, pitch, major diameter, minor diameter, and pitch diameter, ensuring uniformity in thread geometry.
4. Tolerances and Allowances: ASME B1.1-2024 provides detailed tables and formulas for calculating the tolerances and allowances for screw threads. This includes allowances for fit and tolerances for variations in thread dimensions, ensuring that manufactured threads meet the required precision and performance standards.
5. Design Considerations: The standard includes guidelines for the design of screw threads, taking into account factors such as load capacity, material selection, and intended application. This helps designers choose the appropriate thread class and form for their specific needs.
6. Inspection and Measurement: ASME B1.1-2024 outlines methods for inspecting and measuring screw threads to ensure they meet the specified dimensions and tolerances. This includes the use of various gauges and measuring instruments to verify thread accuracy.
7. Updates and Revisions: The 2024 edition incorporates updates and revisions based on the latest research, technological advancements, and industry feedback. This ensures that the standard remains current and relevant to modern manufacturing practices.

By adhering to the guidelines and specifications in ASME B1.1-2024, engineers and manufacturers can ensure the production of high-quality, compatible, and reliable screw threads for a wide range of applications.

General Product Information: