It is often required to draw these screws and although the head type and the length are generally quoted in parts lists it is necessary to know the proportions of the head. Dimensions follow for each of the most commonly used screws.
Before specifying screws it is advisable to consult a manufacturers list for availability. In the interest of standardization and economy, designers are urged to use stock lengths wherever possible and standard lengths of screws include the following; 3, 4, 5, 6, 8, 10, 12, 16, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, and 200 mm. If lengths over 200 mm are required, then increments of 20 mm are the preferred ISO lengths. It should be understood that not all diameters of screw are available in the above lengths. For example, the range of lengths for an M3 screw lies between 5 and 35 mm, for an M10 screw between 12 and 100 mm for one particular type of head. The same range will also not cover different types of head, hence the necessity to check stock lists.
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