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Description
TNMM 220416 turning insert – indexable 60° triangle
| Technical data | |
|---|---|
| Side length l | 22.0 mm |
| Insert thickness s | 4.76 mm |
| Inscribed circle diameter IC | 12.7 mm |
| Corner radius rε | 1.6 mm |
| ANSI code | TNMM 434 |
S20 carbide indexable insert – applications and design
double-sided 60° triangle with a hole and chip breaker
The TNMM 220416 turning insert is a double-sided, triangular indexable insert made of S20 grade cemented carbide, intended for turning steel, cast steel and low-alloy cast steel. Shape T, an equilateral triangle with a 60° corner angle, facilitates access to the workpiece contour during longitudinal turning and facing. Negative geometry with a 0° clearance angle allows both sides of the insert to be used — up to six cutting edges in total. The large nose radius rε of 1.6 mm strengthens the tip and supports roughing and semi-finishing at greater depths of cut and moderate feed rates. The mounting hole with a single-sided chip breaker (type M according to ISO 1832) controls chip flow and breaking.
Key advantages of the S20 cemented carbide insert
- Six cutting edges — 3 corners on each of the two sides reduce the cost per cutting edge compared with single-sided inserts.
- Grade S20 for ISO groups P and K — uncoated carbide for steel, cast steel and low-alloy cast steel (P15-P25), and, according to the cutting data table, also for malleable cast iron.
- Large corner radius rε 1.6 mm — a reinforced cutting edge for roughing and semi-finishing at greater depths of cut.
- Negative geometry with a 0° clearance angle provides a strong cutting edge that withstands high loads.
- Dimensions comply with ISO 1832: side length 22 mm, IC 12.7 mm (1/2″), thickness 4.76 mm — compatible with tool holders with a size 22 triangular pocket.
- Tolerance class M provides repeatable corner positioning after indexing the insert in the tool holder pocket.
Applications and parameter selection for the triangular insert
The TNMM 220416 insert (also written without a space as tnmm220416) performs well when turning shafts, bushings, flanges and forgings made of structural steels and cast steel, and, according to the grade's cutting data table, also malleable cast iron. Grade S20 is uncoated carbide that performs well at high cutting speeds and moderate feed rates, where a sharp edge and stable turning are essential. Calculate the spindle speed using n = 1000·Vc/(π·D): for example, a shaft with a diameter of 60 mm at a cutting speed Vc = 150 m/min requires about 796 rpm. Select the speed according to material hardness, and maintain a constant feed rate with cast steel to limit impact loading on the cutting edge. TNMM 220416 indexable inserts are supplied by the Polish manufacturer Baildonit.
The large nose radius of 1.6 mm increases tip strength and allows a greater depth of cut without the risk of chipping, but increases radial forces — on slender workpieces supported at one end, it may promote vibration. Tolerance class M ensures repeatable cutting edge positioning after indexing the insert in the pocket, so changing the cutting edge does not require resetting the tool. The thickness of 4.76 mm and side length of 22 mm match tool holders with a size 22 triangular pocket used for external turning of steel and cast steel. Uncoated S20 carbide performs best with coolant, which removes heat from the cutting zone and limits built-up edge.
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Application limitation
Uncoated grade S20 is not intended for hardened steels or austenitic stainless steel (group ISO M). For difficult-to-machine materials and machining at elevated temperatures, select an insert in a coated grade.
Triangular insert designation decoder according to ISO 1832
how to read the TNMM 220416 code — positions 1–7 of the designation
Designation TNMM 220416 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 TNMM 220416 insert
design, materials, and turning parameters
Six — the triangle has 3 corners per side, and the negative geometry (0° clearance angle) allows both sides of the insert to be used. When one corner becomes dull, simply index the insert in the pocket without changing the tool holder.
Grade S20 is uncoated carbide for group ISO P: steel, cast steel and low-alloy cast steel (P15-P25). According to the cutting data table, it also covers malleable cast iron in group K. For stainless steel and hardened materials, select a coated grade.
Only in the nose radius. The radius 0.4 mm is used for finishing at low feed rates, 0.8 mm is the general-purpose version, and 1.6 mm on TNMM 220416 strengthens the cutting edge for roughing at greater depths of cut. The remaining dimensions (IC 12.7 mm, thickness 4.76 mm) are identical.
No — grade S20 is uncoated carbide. The sharp edge of uncoated carbide performs well when turning steel and cast steel at high cutting speeds and moderate feed rates. Coolant is recommended to remove heat from the cutting zone and limit built-up edge.
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