Types Of Drawing Sheets And Their Sizes

Drawing paper sizes

The British Standard BS8888 recommends that for normal practical purposes the area of the largest sheet is one square metre and the sides are in the ratio of The dimensions of the sheet are 841 mm x 1189 mm. For smaller sheets the longest side is progressively halved giving the designations and dimensions in Table 5.1. Since the AO size has the area of one square metre, paper weights are conveniently expressed in the unit 'grams per square metre'.

Table 5.1

Name of firm, Drawing number, Component name,

Drawing scale and units of measurement, Projection used (first or third angle) and or symbol, Draughtsman's name and checker's signature, Date of drawing and subsequent modifications, Cross references with associated drawings or assemblies.

Other information will vary according to the branch and type of industry concerned but is often standardized by particular firms for their own specific purposes and convenience.

Table 5.1

Designation	Size (millimetres)	Area
AO	841 x 1189	1 m2
A1	594 x 841	5000 cm2
A2	42O x 594	2500 cm2
A3	297 x 420	1250 cm2
A4	210 x 297	625 cm2

Drawing sheets may be obtained from a standard roll of paper or already cut to size. Cut sheets sometimes have a border of at least 15 mm width to provide a frame and this frame may be printed with microfilm registration marks, which are triangular in shape and positioned on the border at the vertical and horizontal centre lines of the sheet.

Title blocks are also generally printed in the bottom right-hand corner of cut sheets and contain items of basic information required by the drawing office or user of the drawing. Typical references are as follows:

1189

Engineering Drawing Scale Size

Microfilm

Fig. 5.1 Standard size reductions from AO to 35 mm microfilm

Microfilm

Fig. 5.1 Standard size reductions from AO to 35 mm microfilm

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