Cover Image
close this bookThreaded Joints - Course: Techniques of Fitting and Assembling Component Parts to Produce Simple Units. Trainees' Handbook of Lessons
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

6. Types of Threaded Joints

Threaded joints are specified below for the way a joint is made, or for its purpose.

Direct joints

The component parts to be joined have internal or external thread and are directly screwed together. No additional fastening elements are needed.


Figure 16. Direct joint

Indirect joints

The component parts to be joined are held together by standardized components, i.e. bolts, screws and nuts. Locking devices and washers may be used additionally.

Where a component part has a female thread, the joint may be made without a nut. The walls of the work-piece must be sufficiently thick for this kind of joint.


Figure 17. Indirect joint

Fastening joints

The component parts are to be joined directly or indirectly only for the purpose of connecting them. The vee-thread, ISO metric vee-thread or Whitworth thread, are the preferred types of thread. Both threads are self-retaining.


Figure 18. Screwed joint for fastening purpose

Adjustable joints

The component parts are joined for the purpose of connecting them and transmitting movements or forces. The preferred types of thread are round thread, acme standard screw thread or saw-tooth thread.

These are less self-retaining.


Figure 19. Adjustable joint

1 round thread, 2 acme standard screw thread, 3 saw-tooth thread

Name different types of threaded joints.