ISO 129-5:2018 pdf free download.Technical product documentation — Indication of dimensions and tolerances — Part 5: Dimensioning of structural metal work.
1 Scope
ISO 129-5 specifies the dimensioning of drawings for general use on structural metal work mainly
consisting of plates, bars and profile sections.
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 129-1, Technical drawings — Indication of dimensions and tolerances Part 1: General principles Iso 129-4, Technical product documentation (TPD) — Indication of dimensions and tolerances — Part 4:
Dimensioning of shipbuilding drawings
ISO 5261:1995, Technical drawings — Simplified representation of bars and profile sections
ISO 65 7-1. Hot-rolled steel sections — Part 1: Equal-leg angles — Dimensions
ISO 65 7-2, Hot-rolled steel sections — Part 2: Unequal-leg angles — Dimensions
ISO 657-16, Hot-rolled steel sections — Part 16: Sloping flange column sections (metric series) — Dimensions and sectional properties
ISO 657-18, Hot-rolled steel sections — Part 18: L sections for shipbuilding (metric series) — Dimensions, sectional properties and tolerances.
4 Basic requirements
Basic requirements of dimensioning are as follows:
a) The indication of dimensions and tolerances shall tollow the general principles specilied in Iso 129-1.
b) The dimensions of structural metal work shall be simple and clear. The standard plates and profile sections should be represented with code.
c) The datum line of dimensioning should be the centroidal line of component.
To maintain readability of drawings and to simplify drawing, dimension lines can be omitted as shown in Figure 1.
5 Simplified dimensioning of structural metal work
Schematic dimensioning of structural metal work shall conform to the representation method specified by ISO 5261.
The arc length of a circular structure in the frame should be dimensioned on one side of its line. An example is shown in Figure 1.
6 Dimensioning of component profile
61 Profile code
The representation of profile sections shall use the form of Figure 2. A type code of CN is required to indicate cold formed sections and that the type code can be omitted for all other types of section. “Graphical symbol or letter code” represents the shape of profile sections, see Table 1 to Table 3. The proportion and dimensions of the graphical symbols shall be as specified in Annex A. “Standard number” is the code of technical standard which specifies the technical requirements of the section. “Necessary size” is the main size of the section. The parameters of size should be separated with the times sign, “x”, see Table 1 to 3.
6.2 Dimensioning samples
Equal leg angle iron, size 50 mm x 50 mm x 4 mm, length 1 000 mm:
Liso 167-1 50x50x4— 1000
The standard code can be omitted when no such standard exists or the omission does not lead to a
misunderstanding:
L50 x 50 x 4—1000
For simplification, a capital ‘L’ can be used instead of the graphical symbol:
L50x50x4— 1000
Figure 3 — Indication of profiles
The size and specification of a component could be indicated by a leader line. The cutting length in profile code can be omitted when it has been presented in the schematic drawing and the general drawing. See Figure 3 b).
The number of components shall be indicated in front of the specification, see Figure 3.
When the number of components is large, they should be numbered in the drawing, and the sizes and specifications presented in appropriate columns in a table. See Figure 4.