CNMG and SNMG 1204 Carbide Turning Inserts for Steel and Stainless Steel
CNMG and SNMG 1204 carbide inserts provide a broad turning range for steel and stainless steel. The CNMG 80° diamond and SNMG square geometries support external turning, facing, semi-finishing and roughing, with multiple grades and chipbreakers available for distributor product-line coverage.
Consistent Quality
Consistent geometry across repeat orders.
Flexible Orders
Small batches and mixed sizes available.
OEM Support
Custom marking, labels and packaging.
Standard & Custom
Standard sizes and custom configurations.
◆Product Overview
The CNMG and SNMG 1204 carbide turning insert series
provides two strong negative-rake geometries for external turning, facing, roughing and
semi-finishing of steel and stainless steel. CNMG inserts offer versatile profiling access,
while SNMG inserts provide a strong square geometry for stable cutting under heavier loads.
For a wider product-line comparison, buyers can also review our
complete CNC turning and milling insert range.
Multiple grades, coatings and chipbreakers can be selected according to the workpiece
material, cutting condition and target market.
SNMG120404 / 120408 / 120412
SNMG: square, negative
Turning / Facing / Profiling / Roughing
Finishing / Medium / Roughing
Final packing confirmed by model
Neutral or private-label packaging
MOQ, grade availability and lead time are confirmed according to the selected model, chipbreaker, coating, packaging option and total order mix.
◆Model and Grade Reference
Use the following charts to compare CNMG model codes, dimensions, chipbreakers and
grade recommendations. Final availability should be confirmed before placing an order.
◆CNMG Insert Machining Application
Machining demonstration for CNMG120408 and CNMG120404 inserts. Actual performance
depends on the selected grade, chipbreaker, holder rigidity, workpiece material and cutting parameters.
◆Grade Selection by Workpiece Material
| Workpiece | Suggested Coating Direction | Typical Operation | Selection Priority |
|---|---|---|---|
| Steel | CVD or application-specific PVD | Roughing / Medium / Finishing | Wear resistance and edge strength |
| Stainless Steel | Sharp PVD-coated grade | Medium / Semi-finishing | Sharpness and controlled cutting heat |
| Cast Iron | Grade-dependent CVD option | General turning / Roughing | Abrasion resistance and stable edge |
For a practical explanation of ISO insert shapes, grade groups and chipbreakers, read our carbide insert selection guide.
◆Why Distributors Choose This Series
CNMG and SNMG models help distributors cover general turning and heavier square-insert applications.
Selected models, radii, grades and chipbreakers can be combined according to the confirmed order plan.
Neutral boxes, customer labels, SKU labels, barcode labels and branded packaging are available by confirmation.
Model, grade, chipbreaker, labeling and batch information can be confirmed for repeat wholesale orders.
CNMG 1204 Size Chart & Specifications
The supplied charts show CNMG negative turning inserts with an 80° diamond shape and central fixing hole. The table below focuses on the CNMG 1204 ordering codes relevant to this product title. All dimensions are in millimeters; the geometry suffix and corner radius must be included when selecting an insert.
| Ordering Code | Geometry | L | IC | S | d | r |
|---|---|---|---|---|---|---|
| CNMG120404-HQ | HQ | 12.9 | 12.7 | 4.76 | 5.16 | 0.4 |
| CNMG120408-HQ | HQ | 12.9 | 12.7 | 4.76 | 5.16 | 0.8 |
| CNMG120412-HQ | HQ | 12.9 | 12.7 | 4.76 | 5.16 | 1.2 |
| CNMG120404-CQ | CQ | 12.9 | 12.7 | 4.76 | 5.16 | 0.4 |
| CNMG120408-CQ | CQ | 12.9 | 12.7 | 4.76 | 5.16 | 0.8 |
| CNMG120412-CQ | CQ | 12.9 | 12.7 | 4.76 | 5.16 | 1.2 |
| CNMG120404-TF | TF | 12.9 | 12.7 | 4.76 | 5.16 | 0.4 |
| CNMG120408-TF | TF | 12.9 | 12.7 | 4.76 | 5.16 | 0.8 |
| CNMG120404-TM | TM | 12.9 | 12.7 | 4.76 | 5.16 | 0.4 |
| CNMG120408-TM | TM | 12.9 | 12.7 | 4.76 | 5.16 | 0.8 |
| CNMG120412-TM | TM | 12.9 | 12.7 | 4.76 | 5.16 | 1.2 |
| CNMG120416-TM | TM | 12.9 | 12.7 | 4.76 | 5.16 | 1.6 |
| CNMG120404-MS | MS | 12.9 | 12.7 | 4.76 | 5.16 | 0.4 |
| CNMG120408-MS | MS | 12.9 | 12.7 | 4.76 | 5.16 | 0.8 |
| CNMG120412-MS | MS | 12.9 | 12.7 | 4.76 | 5.16 | 1.2 |
| CNMG120404 | No suffix shown | 12.9 | 12.7 | 4.76 | 5.16 | 0.4 |
| CNMG120408 | No suffix shown | 12.9 | 12.7 | 4.76 | 5.16 | 0.8 |
| CNMG120412 | No suffix shown | 12.9 | 12.7 | 4.76 | 5.16 | 1.2 |
Original Model & Grade Charts
The original images also list other CNMG size families and show P, M and K grade columns. Check the marked combination for the selected full code. The images do not define the meaning of each filled or open mark; confirm the grade designation, coating and availability for steel or stainless steel with the quotation.
SNMG 1204 Size Chart & Designation
The SNMG chart lists four 1204-size TM variants. SNMG is a square, 0° relief insert. For the four listed models, L and IC are 12.7 mm, thickness S is 4.76 mm and fixing-hole diameter d is 5.16 mm; corner radius varies by ordering code.
| Ordering Code | L (mm) | IC (mm) | S (mm) | d (mm) | r (mm) |
|---|---|---|---|---|---|
| SNMG120404-TM | 12.7 | 12.7 | 4.76 | 5.16 | 0.4 |
| SNMG120408-TM | 12.7 | 12.7 | 4.76 | 5.16 | 0.8 |
| SNMG120412-TM | 12.7 | 12.7 | 4.76 | 5.16 | 1.2 |
| SNMG120416-TM | 12.7 | 12.7 | 4.76 | 5.16 | 1.6 |
Selection & Cutting Data
Holder fit: Match insert shape, IC, thickness and fixing hole to the intended holder; CNMG and SNMG are not interchangeable by size code alone.
Geometry and grade: Select the full ordering code, radius and approved carbide grade for the workpiece material, cutting operation and machine rigidity.
Starting parameters: The charts do not state cutting speed, feed or depth of cut. Confirm grade-specific cutting data and validate the settings with a trial cut.
◆Carbide Insert Customization & OEM
Specify the insert around the machining operation, workpiece and holder. We can review standard replacements, application-specific geometry and private-label requirements using your insert designation, drawing or sample. Available grades, coatings, dimensions and order quantities are confirmed for each requested series.
Geometry & Chip Control
Review chipbreaker, rake, cutting-edge preparation, nose radius and corner design for the operation and workpiece. Confirm holder compatibility before approving a modified geometry.
Substrate & Coating
Select an available carbide grade and coating for the workpiece material, cutting conditions and desired balance of wear resistance and edge toughness.
Dimensions & OEM
Review insert size, thickness, locating and clamping features, tolerances, laser marking and private-label packaging against the approved specification.
◆Customization Options
Use the fields below when sending an inquiry. The exact options depend on the insert family and are confirmed in the quotation or approved drawing.
| Specification | Details to Confirm |
|---|---|
| Insert Type | Turning, milling, threading, grooving or drilling insert; send the designation or drawing. |
| Size & Fit | Shape, size, thickness, inscribed circle or edge length, hole or clamping form, and holder model. |
| Cutting Geometry | Chipbreaker, nose or corner radius, edge preparation, cutting direction and application-specific profile. |
| Grade & Coating | Workpiece group and grade, carbide substrate, coating system and wet or dry cutting conditions. |
| Tolerance & Inspection | Critical dimensions, profile requirements, inspection method and any required report. |
| OEM Presentation | Insert or box marking, label content, packaging format and quantity per pack. |
◆How to Request a Custom Insert
Send your insert requirements through our contact form or review our OEM and private-label service.
◆Carbide Insert Quality Control
Insert quality depends on the approved grade, geometry, coating and dimensional specification. We review the requirements at order confirmation and align the inspection scope with the insert series and any customer drawing. Share critical dimensions or documentation needs before production so they can be included in the agreed inspection plan.
01 · Incoming Material
Confirm the specified carbide grade or material documentation against the order requirements.
02 · In-Process Checks
Review dimensions and cutting-edge features during production against the approved specification.
03 · Final Inspection
Check the agreed dimensions, appearance, edge condition, coating identification and marking as applicable.
04 · Packing Review
Verify the item code, quantity, labels and protective packing against the approved order.
◆Inspection & Documentation
Inspection points and acceptance criteria should be agreed for the ordered series. For custom inserts, the approved drawing takes priority over a generic catalogue description.
| Check Area | What to Confirm |
|---|---|
| Dimensions & Fit | Insert size, thickness, corner radius, clamping features and any drawing tolerances. |
| Cutting Geometry | Chipbreaker, edge preparation, usable corners and profile where applicable. |
| Grade & Coating | Approved grade and coating designation; any requested verification method. |
| Appearance & Packing | Visible edge damage, marking, item code, count and packing format. |
| Requested Records | Inspection report, material or coating documentation, sample approval or batch identification when agreed. |
◆Order & Delivery
Share a line-by-line list of insert codes and quantities for a mixed-size quotation. Stock status, minimum quantity, sample requirements and production lead time are confirmed for each grade, coating and configuration.
Send your item list and quality requirements through our contact form for specification, availability and delivery confirmation.
◆Product FAQs
What is the difference between CNMG and SNMG inserts?
CNMG is an 80° diamond insert; SNMG is a square insert. Both families shown here use a 0° relief angle, but their shapes and holder pockets differ. Match the complete insert code to the toolholder rather than substituting one shape for the other.
Which CNMG and SNMG 1204 sizes are listed?
The CNMG charts list 120404, 120408 and 120412 with several geometry suffixes, plus 120416-TM. The SNMG chart lists 120404-TM, 120408-TM, 120412-TM and 120416-TM. The final 04, 08, 12 and 16 indicate corner radii of 0.4, 0.8, 1.2 and 1.6 mm respectively; check the Specification tables for each complete code.
Do CNMG 1204 and SNMG 1204 have the same dimensions?
The supplied charts show IC 12.7 mm, thickness 4.76 mm and fixing hole 5.16 mm for the listed 1204 variants of both families. The charted L dimension is 12.9 mm for CNMG and 12.7 mm for SNMG. Their shapes and holder interfaces remain different despite the shared 1204 size code.
How should I choose a corner radius?
Choose the radius around the required finish, feed, depth of cut, machine rigidity and available geometry. A smaller radius can reduce cutting load in a light finishing cut; a larger radius may support a stronger edge but can increase radial force. Confirm the selected grade and chipbreaker before setting cutting parameters.
Are the same inserts suitable for steel and stainless steel?
Suitability depends on the exact carbide grade, coating, chipbreaker and cutting conditions, not the CNMG or SNMG shape alone. State the workpiece grade and hardness, operation, coolant and whether the cut is continuous or interrupted. We can then confirm a grade and geometry combination for the application.
Is SNMG120408-GM included in the size table?
The SNMG image uses SNMG120408-GM as a designation example, while its dimension table lists the TM variants. The example does not confirm GM stock, grade or chipbreaker availability. Specify the exact suffix and request confirmation before ordering.
◆Ordering & OEM FAQs
Can I order CNMG and SNMG models together?
Send a line-by-line list with the complete CNMG or SNMG code, requested carbide grade, quantity and destination. Mixed-model supply, pack quantity, minimum order quantity and lead time are confirmed for each configuration.
What information should I send for a replacement insert?
Send the current insert's full designation, grade and chipbreaker, photos of the insert and box label, toolholder model, workpiece material, operation and quantity. If available, include the current cutting conditions and the problem you want to solve.
Can the grade, coating or packaging be customized?
Provide the target material, operation, desired geometry or coating, marking and packaging requirements. Available grade and OEM options depend on the model and order quantity; confirm the final specification, sample plan and delivery terms in the quotation.
Can I test samples before a production order?
Request samples by complete insert code and grade, then test them in the intended holder and workpiece. Record the cutting parameters, edge wear, chip control, surface finish and accepted parts so that the trial can guide a repeat order.
◆Guides & Technical References
Use the CNC Insert Selection Guide for turning shape, grade, nose-radius and chipbreaker checks. The Carbide Insert Types Guide explains the wider insert families.
For a model-specific drawing or quotation, send the complete insert and holder codes with the workpiece material, application and quantity.
Need Sizes, Pricing or Custom Options?
Send us the required tool type, sizes, quantities, workpiece material and any OEM or custom requirements. We will confirm suitable specifications, availability, lead time and quotation details.
Drawings, size lists and reference photos are welcome.
