Conventional drawing of fixings and joints

SCREW JOINT

The thickness of an overhead joining part and parameters of a screw are input data for the drawing of a screw joint. At the structural drawing of a screw joint (fig. 4.24, а, b, c) it is necessary to draw all structural elements of parts. The sizes of a thread, length of a screw and sizes of a base surface under a head fill in. A slot under a screwdriver is disposed under the corner 45° at the view from the face head. On the simplified drawing of a screw joint (fig. 4.24, d, e, f) the sizes of a thread and a length of a screw are marked. A slot under a screwdriver is represented an incrassate contour line. The thread opening under a screw is drawn like an opening under a stud.

а) b) c) d) e) f)

Figure 4.24 – The screw joint

The parameters of a base surface under a head of screw are regulated by State Standard 12876:2008.

The conventional drawing of fixings (table 4.11) is regulated by State Standard 2.315:2008. Fixings for which on a drawing the diameter of a bar is equal 2 mm or less is shown conventionally. Conventional drawing and its sizes must give exhaustive and necessary information about the view of a joint and its components.

Table 4.11 - The conventional drawing of fixings

Name of a part	View	Drawing	Name of a part	View	Drawing
Round-head and cheese-head bolts and screws	Main (front)		Nuts	Main (front)
Top		Top
Bottom	·	Washers	Main (front)
Countersunk-head and oval-head screws	Main (front)		Top
Top		Studs	Main (front)
Bottom	·	Top	·

In fig.4.25 the examples of conventional drawings of thread joints are resulted: a – by a bolt on a view and in a section; b – by a stud on a view and in a section; c – by a countersunk-head screw on a view and in a section; d –by a cheese-head screw on a view and in a section.

а) b) c) d)

Figure 4.25 – Conventional drawings of thread joints

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