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close this bookThreaded Joints - Course: Techniques of fitting and assembling component parts to produce simple units. Trainees' handbook of lessons (Institut für Berufliche Entwicklung, 25 p.)
View the document(introduction...)
View the documentPreliminary Remarks
View the documentHints on Labour Safety
View the document1. Purpose of Threaded Joints
View the document2. Selected Types of Bolts and Screws
View the document3. Selected Types of Nuts
View the document4. Selected Types of Locking Devices for Bolts and Screws
View the document5. Selected Types of Washers
View the document6. Types of Threaded Joints
View the document7. Stresses in Threaded Joint
View the document8. Tools
View the document9. The Technological Steps of Making Threaded Joints
View the document10. Undoing Threaded Joints

5. Selected Types of Washers

Washers are placed under the heads of bolts or screws or under nuts, where

- the bearing faces are not properly machined,
- bolts, screws and nuts are to be tightened on oblong holes,
- slopes of the bearing face must be componensated.

Figure 14. Uses of washers

1 washer on an oblong hole, 2 wedge-shaped washer on an inclined face

Washers are made of the same materials as bolts, screws and nuts and can have the same kind of plating.

There are washers of different sizes and thicknesses and to account for different properties in the proportion of hole diameter and width of the edge.

Figure 15. Washers

1 common washers for bolts and screws, 2 washers for elongated holes, 3 wedge-shaped washer for inclined surfaces, 4 washer for iron and steel work

Give uses of washers.