What to specify for a thread
- Thread standard and nominal size
- Pitch or threads per inch
- Internal or external thread
- Thread class or fit requirement
- Thread length and any relief details
- Gauge or mating-part inspection requirement
Threaded turned components
CNC turning can support threaded shafts, threaded pins, connectors, fittings and rotational parts with internal or external threads. Share the intended use when assembly fit is important.
Relief, chamfers and start points
Thread performance involves more than the thread callout. Relief grooves, chamfers, shoulder clearance and thread start position can all affect assembly. If the thread stops against a shoulder or seals against another part, the drawing should show that clearly.
Inspection planning
Thread gauges and dimensional checks can be reviewed as part of the production plan. Critical thread details should be confirmed before sampling.
When to send a mating part
If thread fit is difficult to communicate, a mating part or gauge information can help reduce uncertainty. This is especially useful for replacement parts, non-standard fittings or older components without a complete drawing.