BS ISO 965-3-2021 pdf free download – ISO general purpose metric screw threads — Tolerances Part 3: Limit deviations for screw threads.
This document specifies limit deviations for pitch and crest diameters for IS0 general purpose metricscrew threads (M) conforming to lS0 261 having basic profile in accordance with ISo 68-1.
The limit deviations specified are derived from the fundamental deviations and tolerances specified inISo 965-1.
This document is applicable to lS0 general purpose metric screw threads with the recommendedtolerance classes.
2Normative references
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document.For dated references,only the edition cited applies.Forundated references, the latest edition of the referenced document (including any amendments) applies.ISO 5408,Screw threads — Vocabulary
3Terms and definitions
For the purposes of this part of document, the terms and definitions given in ISO 5408 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:- ISO online browsing platform: available at https:.//www.org/obp
一IEC Electropedia: available at https://www.electropedia.org/
4 Limit deviations
Limit deviations are given in Table 1.
For internal threads as well as external threads, the actual root contour shall not in any point transgressthe basic profile and fundamental deviation.
For coated threads, the tolerances apply to the parts before coating, unless otherwise stated.Aftercoating the actual thread profile shall not in any point transgress the maximum material limits forposition H or h respectively.
NOTE These provisions are intended for thin coatings, for example those obtained by electroplating.BS ISO 965-3 pdf download.