International Standard ISO 261 was prepared by Technical Committee ISO/TC 1, Screw threads, Subcommittee SC 1, Basic data. This second edition cancels and replaces the first edition (ISO 261:1973) which has been technically revised.

Sep 15, 2013 · ISO 261 specifies a detailed list of preferred combinations of outer diameter D and pitch P for ISO metric screw threads. [5] [6] ISO 262 specifies a shorter list of thread dimensions – a subset of ISO 261. [7]

ISO 262 “ISO general purpose metric screw threads — Selected sizes for screws, bolts and nuts”, has not been included as a separate clause in this standard as those sizes will be specified in the various product standards.

This International Standard specifies ISO general purpose metric screw threads (M) having basic profile according to ISO 68-1. Basic dimensions are given in ISO 724. For tolerances see ISO 965-1.

indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO68-1:1998, ISO general purpose screw threads— Basic profile— Part1: Metric screw threads. ISO262:1998, ISO general purpose metric screw threads— Selected sizes for screws, bolts and nuts. ISO724:1993, ISO general purpose metric screw

ISO 261 specifies a detailed list of preferred combinations of outer diameter and pitch for ISO metric screw threads. The 1st choice column follows the R10 series from ISO 3, while the 2nd choice column is rounded off values from the R20 series from ISO 3.

[ISO] ISO 9268 (F6) - 1988: Asymmetrical thread HD [Figure 6] 24 [ISO] ISO 3353-1 - 2020: Aerospace - Lead and runout threads - Part 1: Rolled external threads: 25 [ISO] ISO 262 - 1998: ISO general purpose metric screw threads — Selected sizes for …

International Standard ISO 261 was prepared by Technical Committee ISO/TC 1, Screw threads, Subcommittee SC 1, Basic data. This second edition cancels and replaces the first edition (ISO 261:1973) which has been technically revised.

The IS0 Recommendation R 261, IS0 metric screw threads - General pbn (diameter range 0.25 to 300 mm), was drawn up by Technical Committee ISO/TC 1, Screw threads, the Secretariat of which is held by the Svenges Standardiseringskommission (SIS).

This International Standard specifies ISO general purpose metric screw threads (M) having basic profile according to ISO 68-1. Basic dimensions are given in ISO 724. For tolerances see ISO 965-1.