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Description
SNMM 120412 turning insert – 90° indexable square
| Technical data | |
|---|---|
| Side length l | 12.7 mm |
| Insert thickness s | 4.76 mm |
| Hole diameter d1 | 5.16 mm |
| Corner radius rε | 1.2 mm |
| Inscribed circle IC | 12.7 mm |
| ANSI code | SNMM 433 |
TCH2 carbide indexable insert – applications and design
90° square with a hole and chip breaker
The SNMM 120412 turning insert is a square indexable insert made of TCH2 grade cemented carbide, primarily designed for turning cast iron. Shape S, a square with a 90° corner angle, provides a strong corner that withstands loads during roughing and semi-finishing. The negative geometry with a 0° clearance angle allows both sides of the insert to be used — four corners on each side provide up to eight cutting edges in total. The nose radius rε 1.2 mm and hole with a chip-breaking groove support operation at higher feeds and depths of cut.
Grade TCH2 is a cemented carbide developed for semi-finishing and roughing cast iron at moderate cutting speeds and medium to high feeds, including unfavorable and interrupted cutting conditions. In addition to cast iron, it is suitable for turning copper alloys, light alloys, heat-resistant and high-temperature-strength materials, and plastics. Cemented carbide provides high hardness and abrasion resistance, as well as cutting edge stability at elevated temperatures. Tolerance class M ensures repeatable corner positioning after indexing the insert in the tool holder pocket and reduces the time needed for dimensional corrections between successive cutting edges.
Key features of the TCH2 cemented carbide insert
- Up to eight cutting edges — 4 corners on each of the two sides reduce the cost per cutting edge compared with single-sided inserts.
- Grade TCH2 for cast iron — cemented carbide for semi-finishing and roughing iron castings and difficult-to-machine materials.
- Corner radius rε 1.2 mm — a larger radius increases corner strength at high feeds during roughing.
- The 90° square corner provides a rigid, strong cutting edge for interrupted cutting and larger machining allowances.
- The mounting hole with a chip-breaking groove makes it easier to control chip flow and breaking when turning cast iron.
- Dimensions conform to ISO 1832: side length 12.7 mm, IC 12.7 mm (1/2″), thickness 4.76 mm — compatible with tool holders with a size 12 square pocket.
Square insert applications and cutting data selection
The SNMM 120412 insert (also written without spaces as snmm120412) is suitable for turning iron castings: housings, pulleys, discs, and bushings, as well as components made of copper alloys, light alloys, and heat-resistant and high-temperature-strength materials. Calculate spindle speed using n = 1000·Vc/(π·D): for a casting with a diameter of 80 mm at a moderate cutting speed of Vc = 90 m/min, the result is approximately 358 rpm. The 90° square corner withstands high cutting forces, so the insert is mounted in tool holders with a size 12 square pocket, with the entering angle selected for longitudinal turning or facing. These SNMM indexable inserts in grade TCH2 are supplied by the Polish manufacturer Baildonit.
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Application limitation
Grade TCH2 is designed for cast iron and materials of moderate hardness. It is not suitable for turning hardened steels above 45 HRC — for this type of machining, choose a turning insert for hardened steel with a cubic boron nitride (CBN) cutting edge.
Square insert designation decoder according to ISO 1832
how to read the SNMM 120412 code — positions 1–7 of the designation
Designation SNMM 120412 according to the standard ISO 1832: 4 letters describe geometry and construction, 3 numeric codes describe dimensions. Each field has a number, an icon, and a brief description.
Frequently asked questions about the SNMM 120412 insert
design, materials, and turning parameters
Up to eight — the square has 4 corners per side, and the negative geometry (0° clearance angle) allows both sides of the insert to be used. Once a cutting edge becomes dull, simply index the insert in the tool holder pocket without replacing it.
Grade TCH2 is a cemented carbide for semi-finishing and roughing cast iron. It is also suitable for turning copper alloys, light alloys, heat-resistant and high-temperature-strength materials, and plastics at moderate speeds and medium or high feeds.
Inserts in the family SNMM 1204 differ mainly in nose radius rε. A smaller radius is used for more precise machining at lower feeds, while rε 1.2 mm in this version — for roughing at higher feeds. The other dimensions (IC 12.7 mm, thickness 4.76 mm) are shared.
Yes. The 90° square corner and radius rε 1.2 mm withstand high cutting forces, making SNMM 120412 suitable for roughing and semi-finishing cast iron at medium and high feeds, including interrupted cutting conditions. Ensure rigid clamping of the workpiece and tool holder.
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All orders are delivered by courier company GLS. For orders exceeding 369 PLN gross shipping is FREE
| Courier GLS | Przelew24 / Prepayment | 14,76 zł gross | Delivery time 1 working day |
| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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