Choose a full profile insert when you want the threading tool to form the crest as well as the flanks and root, and you know the exact thread form and pitch. Choose a partial profile insert when you need to cover several pitches within the insert maker’s stated range and can prepare the crest diameter before threading. The choice affects the turning operation that comes before the first threading pass.
What changes at the machine?
| Kiểm tra | Full profile | Partial profile |
|---|---|---|
| Crest formation | The insert tops the crest. Leave the allowance specified for that tooling and application. | The insert does not top the crest. The preceding turning or boring operation sets the crest diameter. |
| Pitch coverage | Match the insert to the exact pitch and thread form. | Check the published pitch range and profile angle. A matching angle alone is insufficient. |
| Typical purchasing decision | Consider it for repeat work on a known thread specification. | Consider it for varied work when the approved range and finished thread requirements allow it. |
On an external thread, the crest is at the major diameter, so a partial profile job starts with the required outside diameter. On an internal thread, the crest is at the minor diameter, so the bore preparation matters. If you switch profile types, review the blank preparation instead of running the previous setup unchanged. Use the drawing, applicable thread requirements and the insert maker’s guidance to establish the dimensions.
Three checks before buying
- Read the complete drawing callout. Record the standard or form, nominal diameter, pitch or threads per inch, and any tolerance and handedness shown. Do not assume that two thread forms are interchangeable because they share the same included angle.
- Match the insert to the holder. Record the full holder code and current insert code or box label. Verify the pocket, insert orientation and any shim requirement in the toolmaker’s documentation. An external or internal family name does not establish that every insert in the family fits the holder.
- Agree on the first-piece check. Confirm the crest diameter and inspect the first thread against the drawing using the specified measurement or gauge. If the thread fails, check the setup and blank diameter before assuming the insert grade is the problem.
What to send for a threading insert quote
Send the thread callout, whether the thread is external or internal, the holder code, the workpiece material and the quantity you need. A clear photo of the current box label is useful when reordering. If the application is new, say whether it is a recurring job or a mix of pitches so the proposed profile can be checked against the work you actually run.
Duyệt 16ER chỉ chèn bên ngoài hay 16IR chỉ nội bộ chèn. If you are unsure which side or holder family you have, start with the 16ER vs 16IR identification guide. To confirm a specific configuration before buying, send your thread and holder details.
Technical references
- Sandvik Coromant: How to choose a thread turning insert and shim — insert profiles, pitch coverage and crest preparation.
- Sandvik Coromant: Thread turning application tips — setup and crest burr considerations.
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