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.
