The application of thread conventions

Figure 15.21(a) shows an elevation of a stud in a tapped hole. When a mating thread is screwed into a tapped hole, the section lines do not cover the assembled threads, also, the threads on the stud terminate at the start of the hole to signify that the stud is screwed to maximum depth. Adjacent parts in the sectional view are cross hatched in opposite directions. It is not normal practice to section nuts, bolts and washers.

Exercise—Draw a similar assembly using a M24 stud. The stud is screwed for 30 mm into the tapped hole and the thickness of the component with the clearance hole is 25 mm. Use Table 16.1 for other dimensions and assume proportions of unimportant detail.

Figure 5.21(b) shows part of a component which is held by a set-bolt in a tapped hole. Only part of the shank of the bolt is threaded and this must terminate


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Engineering Drawing Exercises

Fig. 15.21

above the join line between the components for correct assembly.

Exercise—Draw a similar arrangement using an M20 set-bolt which engages with the tapped thread for a length of 25 mm. Component thickness is 22 mm. Assume other dimensions.

Note—The thickness of a nut is slightly greater than the thickness of a bolthead. For approximate constructions of a bolthead, use a thickness of 0.7D, where D is the shank diameter.

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