Analysis: Two short solid lines were added to the front view and the left view respectively, and the section line of the left view was added, and the hexagon repair line of the left view was also different. Connecting two parts that are not too thick and can be drilled into a through hole with bolts, nuts and washers is called bolt connection.

When assembling, the bolt passes through the through hole of the connected piece, the washer is installed at the threaded end, and the nut is screwed. When drawing the thread connection diagram, it can be marked according to the regulations of the parts, and the required dimensions can be found from the relevant standards. This is a structural drawing.

Draw the pattern of bolt connection.

1. Only one line can be drawn on the contact surface of two parts, not two lines or deliberately thickened.

2. The diameter of the through hole of the connector is 1. 1d, and there is a gap between the thread diameter of the bolt and the smooth hole of the connector, that is, two thick solid lines, and their outlines should be drawn separately.

3. In the assembly drawing, when the cutting plane passes through the axes of bolts, nuts and washers, bolts, nuts and washers are usually drawn as uncut.

4. In the sectional view, the section lines of adjacent parts should be diagonally opposite or in the same direction, and the section lines of the same part in each sectional view should be equally spaced in the same direction.