ISO 6410-3:2021 pdf download – Technical drawings — Screw threads and threaded parts — Part 3: Simplified representation.
1 Scope This document establishes rules for the simplified representation of threaded parts, with the exception of screw thread inserts, which are covered in ISO 6410-2. This representation is applicable when it is not necessary to show the exact shape and details of the parts (see ISO 6410-1), for example in assembly drawings. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 6410-1:1993, Technical drawings — Screw threads and threaded parts — Part 1: General conventions 3 Terms and definitions No terms and definitions are listed in this document. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https://www.iso .org/obp — IEC Electropedia: available at http://www.electropedia .org/
4 Simplified representation 4.1 General In simplified representation, only essential features shall be shown. The degree of simplification depends on the kind of object represented, the scale of the drawing and the purpose of the documentation. Therefore, the following features shall not be drawn in simplified representations of threaded parts: — edges of chamfers of nuts and heads; — thread run-outs; — the shape of ends of screws; — undercuts. 4.2 Screws and nuts When it is essential to show the shapes of screw heads, drive patterns or nuts, the examples of simplified representations shown in Table 1 shall be used. Combinations of features, not shown in Table 1, may also be used. A simplified representation of the opposite (threaded) end view is not necessary.
4.3 Small diameter threads It is permissible to simplify the representation and/or the indication of dimensions if — the diameter (on the drawing) is ≤ 6 mm or — there is a regular pattern of holes or threads of the same type and size. The designation shall include all necessary features normally shown in a conventional representation and/or dimensioning, as specified in ISO 6410-1:1993, 4.3. The designation shall appear on a leader line which points to the centre-line of the hole and terminates in an arrowhead (see Figures 1 to 4).
