Initial considerations for threading
These initial considerations will affect the choice of threading method and threading tool as well as how they are applied.
Consider the following dimensions and quality demands of the thread to be machined:
- External or internal thread?
- Thread profile (e.g., metric, UN)
- Thread pitch
- Right- or left-handed thread?
- Number of thread starts
- Tolerance (profile, position)
After considering the features, look at the component:
- Can the component be securely fixed?
- Is chip evacuation or chip control a critical issue?
- Does the material have good chip-breaking properties?
- Component batch size. Mass production of threads may justify using multi-tooth inserts or an optimized Tailor Made tool to maximize productivity
- Single or multi-thread
The thread form
The thread profile defines the geometry of a thread and includes component diameters (major, pitch, and minor), thread profile angle, pitch, and helix angle. See definitions.
The most common thread forms and profiles are shown below.
|Application||Thread form||Thread type||Code|
British Standard (BSPT),
|Food and fire||
||Round DIN 405||RN|
|Oil and gas ||
API “V” form 60°
V38, 40, 50