ISO 1501-2009 amd1-2020 PDF

Full title and description

ISO 1501:2009/Amd 1:2020 — ISO miniature screw threads — Amendment 1: The figure for the tolerance zone of external thread. This entry describes the 2009 International Standard for ISO miniature screw threads together with Amendment 1 published in 2020, which provides a revision/correction to the figure showing the tolerance zone for external threads.

Abstract

ISO 1501:2009 specifies profiles, diameter‑pitch combinations, basic dimensions, tolerances, limits of size and designation for ISO miniature screw threads with nominal diameters from 0.3 mm to 1.4 mm used in precision applications (timepieces, optical instruments, small electrical and measuring instruments, etc.). Amendment 1 (2020) updates the figure for the tolerance zone of external threads to correct/clarify the original illustration.

General information

• Status: Published (International Standard with amendment).
• Publication date: Base standard published May 2009; Amendment 1 published 29 January 2020.
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 21.040.30 (Special screw threads).
• Edition / version: Edition 1 (2009) with Amendment 1 (2020).
• Number of pages: Base standard: 16 pages; Amendment 1: 1 page (illustrative correction).

Scope

Defines the geometric profile, diameter‑pitch combinations, basic dimensions, tolerance system and limits of size for ISO miniature screw threads (nominal diameters 0.3 mm to 1.4 mm). The threads covered are intended for precision small-scale applications (for example watchmaking, optical instruments and precision measuring devices). Amendment 1 specifically revises the figure that illustrates the tolerance zone of the external thread to ensure correct interpretation and application.

Key topics and requirements

• Definition of thread profile for ISO miniature screw threads (distinct from general-purpose metric thread profiles).
• Permitted diameter–pitch combinations for nominal diameters 0.3 mm to 1.4 mm.
• Basic dimensions, limits of size and designation rules for miniature threads.
• Tolerance system and tolerance zones for internal and external miniature threads; Amendment 1 corrects the figure for the external-thread tolerance zone.
• Application guidance for precision instruments and small assemblies where miniature screw threads are required.

Typical use and users

Engineers and designers of precision mechanical products (watch and clock manufacturers, optical instrument makers, micro‑mechanical device manufacturers), quality and inspection laboratories, screw and fastener manufacturers producing miniature threads, and standards or compliance personnel who specify or verify thread geometry and tolerances for small-scale assemblies.

Related standards

Related screw‑thread standards and guidance documents typically used alongside ISO 1501 include general metric thread standards and tolerance/fit standards (for example other ISO standards that define metric thread profiles, designation and tolerance systems). National or regional adoptions (for example BS ISO 1501:2009+A1:2020) provide identical/adopted versions for specific markets.

Keywords

miniature screw threads, external thread tolerance zone, thread profile, diameter‑pitch combinations, precision threads, watchmaking, optical instruments, ISO 1501, amendment 2020

FAQ

Q: What is this standard?

A: ISO 1501:2009 is the International Standard that defines ISO miniature screw threads (nominal diameters 0.3 mm to 1.4 mm). Amendment 1 (2020) corrects the figure for the tolerance zone of the external thread.

Q: What does it cover?

A: It covers thread profiles, diameter‑pitch combinations, basic dimensions, limits of size, tolerance zones and designation rules for miniature screw threads used in precision products; the amendment updates the external-thread tolerance‑zone figure for clarity and correctness.

Q: Who typically uses it?

A: Manufacturers and suppliers of miniature screws and fasteners, precision‑mechanical product designers (watches, optical instruments, precision meters), inspection/test labs and standards compliance teams.

Q: Is it current or superseded?

A: The base standard ISO 1501:2009 is published and remains the valid edition; Amendment 1 was published in January 2020 to update an illustrative figure. The consolidated set (ISO 1501:2009 with Amd 1:2020) represents the current published content for this standard.

Q: Is it part of a series?

A: ISO 1501 is a stand‑alone standard addressing miniature screw threads, but it sits conceptually alongside other ISO screw‑thread and tolerance standards that together cover metric thread profiles, fits and limits used across applications.

Q: What are the key keywords?

A: miniature screw threads; external thread tolerance; thread profile; diameter‑pitch; precision threads; ISO 1501; amendment 2020.