Making a bolted connection 

There are structural, simplified and conventional images of fasteners when depicting connections. In the structural image, the dimensions of the parts and their elements are selected according to the relevant standards. In the simplified image, the dimensions of the fasteners are determined by conditional relationships depending on the thread diameter. Chamfers, threads in blind holes, etc. are drawn in a simplified way.

Figure 5.1.1 shows a simplified image of a bolted connection.

The peculiarity of such an image is as follows:

1. The thread is depicted on the entire bolt rod;

2. The bolt rod is depicted without chamfers;

3. The gap between the bolt rod and the hole is not shown.

The working length of the bolt l is determined as: l = t + 1.3d, where t is the thickness of the parts being fastened;

1.3d is a value that takes into account the height of the nut, washer and the margin of the bolt rod length.

Figure 5.1.1. Bolted connection

According to the GOST 2.315-68 standard, on assembly drawings and general view drawings, the image of fasteners (simplified and conventional) is selected depending on the purpose and scale of the drawing. Fasteners in which the diameters of the rods are 2 mm or less are depicted conventionally.

Figure 5.1.1. b shows a conventional image of the connection in section.

When making threaded connections, only three dimensions are specified in the drawing: the diameter of the thread, the length of the bolt and the diameter of the hole in the fastened parts.

On the main view, it is customary to depict the bolt head and nut with three faces. On assembly drawings and general view drawings, GOST 2.315-68 recommends performing a simplified bolt connection.

Table 5.1.1

Variant tasks