Quick answer: the size codes correspond, but the complete order specification still matters
VNMG331 is paired with VNMG160404 in the manufacturer catalogue checked for this guide. Cobra Carbide’s 2024 insert catalogue lists VNMG 331 alongside VNMG 16 04 04, and VNMG 332 alongside VNMG 16 04 08. Use that correspondence to identify a candidate size—not to approve a different brand, chipbreaker or grade.
For a replacement quotation, keep the original box label and full designation. Confirm the holder’s approved insert specification, then the chipbreaker, grade and application. Two shortened codes cannot establish the complete supplied configuration.
Which codes correspond in the checked catalogue?
| Insert style shown | ISO designation shown | Use in procurement |
|---|---|---|
| VNMG 331 | VNMG 16 04 04 | Candidate correspondence for the base size designation |
| VNMG 332 | VNMG 16 04 08 | A different code pair; keep the original radius specification |
The spaces above follow the catalogue. Continuous labels such as VNMG160404 should still be checked against the original manufacturer’s drawing and complete order number. The table establishes these named code pairs; it does not establish equivalent grades or a universal replacement rule.
Why you should not convert every digit directly into a dimension
When a purchasing record changes between designation systems, copying a number into a millimetre field can introduce an error. A nominal size position is not automatically the measured overall length, inscribed circle, or hole diameter.
Ask for the current drawing with its dimension labels. Check the actual values for the offered insert and the holder’s accepted size. Keep the original units next to any recorded measurement. If your team converts a value, retain the source value too, so an engineer can review the conversion rather than relying on a rounded purchasing note.
For the wider designation sequence, use the turning insert nomenclature guide. This page focuses on the two catalogue code pairs above and the order information they leave unresolved.
Four checks before treating the offered insert as a replacement
1. The complete designation and manufacturer
Record the full code exactly as printed, including suffixes, grade and manufacturer. A useful inquiry includes a sharp photograph of the label as well as typed text. This lets the supplier catch a missing character or an unfamiliar suffix before preparing an offer.
2. The holder and clamping interface
Send the complete holder designation and its approved insert list if available. If the marking is damaged, add photographs of the empty pocket, shim, clamp, screw and both insert faces. Request confirmation against the actual assembly. Do not approve a substitute merely because it looks similar or a screw passes through its hole.
3. The chipbreaker and grade
A size correspondence leaves the application choice open. Ask the supplier to state the offered chipbreaker and original technical grade separately, with the supporting application information. If the offer uses a different manufacturer’s code, ask which parts of the specification match and which still need a trial. An unexplained “equivalent” label is not enough for a repeat order.
4. The workpiece and operation
Include the material designation and hardness where known, operation, current cutting conditions and the problem you want to solve. A buyer trying to replace a lost box label needs a different response from a buyer investigating chipping or poor chip control. State that purpose early so the quotation addresses the actual job.
A quotation request that is easier to answer
Use this checklist to keep the identification task separate from the commercial offer:
- Current item: complete original designation, manufacturer, label photo and any previous order reference.
- Candidate code: note the catalogue correspondence you found, while asking for confirmation of the complete offered model.
- Machine setup: holder code, pocket and clamping photographs if needed.
- Application: workpiece material, operation, current settings and the issue being reviewed.
- Commercial scope: quantity, destination and whether you want an initial sample or repeat supply.
Ask the quotation to identify the offered model, chipbreaker and grade on separate lines. Confirm packaging, availability and delivery terms for that particular offer instead of carrying assumptions from a catalogue or an earlier order.
You can review the listed VNMG turning insert configurations and send the full code, holder details and quantity for a configuration review. A model appearing in the table is an inquiry reference; the exact offered specification and commercial terms remain subject to confirmation.
If the label is missing
Describe the item as unidentified rather than assigning the nearest-looking code. Send clear photographs of both faces and the side, the holder marking and the empty pocket. Include measured dimensions as identification evidence, with units and the measurement method. Ask the supplier to return a candidate identification and list any unresolved points.
If the grade is unknown, say so. The replacement inquiry guide for a missing grade code explains how to separate a size match from an application review. Do not rewrite the original purchasing record until the proposed configuration has been checked.
Часто задаваемые вопросы
Are VNMG331 and VNMG160404 the same order specification?
They are paired as size designations in the checked manufacturer catalogue. The complete order still needs the manufacturer, chipbreaker, grade and holder compatibility to be confirmed.
Can I order VNMG332 instead of VNMG331?
Do not treat them as interchangeable. The catalogue pairs 332 with 16 04 08 and 331 with 16 04 04. Confirm the original radius requirement and the complete approved configuration before changing the code.
Does a matching base code prove that two grades are equivalent?
No. Request the offered original grade and its application information separately. Code correspondence alone does not establish cutting performance or grade equivalence.
What should I send for a VNMG quotation?
Send the full original code and label photo, holder designation, workpiece material, operation, quantity and destination. Identify any missing information instead of guessing it.
Manufacturer reference and scope
- Cobra Carbide official catalogue downloads: 2024 Inserts Catalog, printed page 29, Style VNMG. The two code pairs above were checked against the full page on October 30, 2026.
The code-pair table is a manufacturer catalogue reference. The inquiry workflow is Vextrex editorial guidance. The catalogue is not evidence of Vextrex stock, supply of that manufacturer’s original products, grade equivalence or approval for a particular holder. Use the current drawing and approved part list for the exact configuration being purchased.
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