Dimensioning squares or flats

Figure 14.23 shows a square machined on the end of a shaft so that it can be turned by means of a spanner.

The narrow diagonal lines are added to indicate the flat surface.

Part of a spindle which carries the chain wheel of a cycle, secured by a cotter pin, illustrates a flat surface which is not at the end of the shaft (Fig. 14.24).

Fig. 14.24

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