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Insert TNMG 160412 BM HC LC 225C Boehlerit
€4.86 tax inc.
Net price: €3.95
Description
TNMG 160412 turning insert – indexable 60° triangle
| Technical data | |
|---|---|
| Side length l | 16.5 mm |
| Insert thickness s | 4.76 mm |
| Corner radius rε | 1.2 mm |
| ANSI code | TNMG 333 |
| Inscribed circle diameter IC | 9.525 mm |
LC 225C carbide indexable insert – applications and design
60° roughing triangle with a hole and chip breaker, nose radius 1.2 mm
The TNMG 160412 turning insert is a double-sided, triangular indexable insert made of grade LC 225C cemented carbide, primarily intended for turning structural and low-alloy steels. Shape T denotes an equilateral triangle with a 60° corner angle, providing easier access to the workpiece profile during longitudinal turning and facing. The negative geometry with a 0° clearance angle allows both sides of the insert to be used — a total of six cutting edges. The enlarged nose radius rε 1.2 mm strengthens the tip and handles higher feed rates, making this a typical roughing version. The hole with a double-sided type G chip breaker according to ISO 1832 controls chip flow and ensures reliable chip breaking.
Key advantages of the LC 225C 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 LC 225C for ISO P20-P45 — CVD-coated carbide provides high hardness and abrasive wear resistance when turning steel at higher spindle speeds.
- Enlarged nose radius rε 1.2 mm — strengthens the corner and allows higher feed rates during roughing.
- Tolerance class M provides repeatable cutting edge positioning after indexing the insert in the holder pocket.
- Dimensions according to ISO 1832: edge length 16.5 mm, IC 9.525 mm (3/8″), thickness 4.76 mm — fit holders with a 16 pocket.
- The 60° corner angle produces lower radial forces than a 80° corner, reducing vibration on slender workpieces.
Applications and parameter selection for the triangular insert
The TNMG 160412 insert, also written without spaces as tnmg160412, performs well in rough turning of shafts, bushings, and flanges made of structural steels. Calculate spindle speed using n = 1000·Vc/(π·D): for a shaft with a diameter of 80 mm at a cutting speed Vc = 280 m/min, the result is approximately 1115 rpm. The enlarged nose radius of 1.2 mm is best used with a depth of cut greater than the radius and feed rates of 0.3–0.5 mm/rev, where the corner cuts stably and wears evenly. Grade LC 225C indexable inserts are supplied by the manufacturer Boehlerit.
The multilayer CVD coating withstands high temperatures in the cutting zone, allowing grade LC 225C to retain hardness and abrasive wear resistance at higher cutting speeds and over extended cutting edge use. During interrupted turning and removal of casting skin, reduce the feed rate on entry into the material to protect the corner from chipping. When machining steel, use emulsion coolant or machine dry, selecting the method to suit the rigidity of the machining setup and the required cutting edge life. Turning tool inserts in this grade work well with holders featuring an entering angle of 90–93° in longitudinal turning and profiling.
▲
Application limitation
Grade LC 225C is a CVD-coated carbide for the group ISO P (steel) — it is not intended for steels hardened above 45 HRC. For hard turning and turning inserts for hardened steel, select the version TNMG 160412 CBN with a cubic boron nitride cutting edge.
Triangular insert designation decoder according to ISO 1832
how to read the TNMG 160412 code — positions 1–7 of the designation
Designation TNMG 160412 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.
Compatible turning tools
holders with a 16 triangular pocket — external and internal turning
TTJNR/L 2020 K1620×20 × 125 mmR right-hand
←L left-hand
→
←L left-hand
→
TTJNR/L 2525 M1625×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
TTJNR/L 3232 P1632×32 × 170 mmR right-hand
←L left-hand
→
←L left-hand
→
TTENN 2020 K1620×20 × 125 mmNeutral
↔
↔
TTENN 2525 M1625×25 × 150 mmNeutral
↔
↔
TTENN 3232 P1632×32 × 170 mmNeutral
↔
↔
TTGNR/L 2020 K1620×20 × 125 mmR right-hand
←L left-hand
→
←L left-hand
→
TTGNR/L 2525 M1625×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
TTGNR/L 3232 P1632×32 × 170 mmR right-hand
←L left-hand
→
←L left-hand
→
TTFNR/L 2020 K1620×20 × 125 mmR right-hand
←L left-hand
→
←L left-hand
→
TTFNR/L 2525 M1625×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
TTFNR/L 3232 P1632×32 × 170 mmR right-hand
←L left-hand
→
←L left-hand
→
MTJNR/L 2020 K1620×20 × 125 mmR right-hand
←L left-hand
→
←L left-hand
→
MTJNR/L 2525 M1625×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
MTJNR/L 3232 P1632×32 × 170 mmR right-hand
←L left-hand
→
←L left-hand
→
MTENN 2020 K1620×20 × 125 mmNeutral
↔
↔
MTENN 2525 M1625×25 × 150 mmNeutral
↔
↔
MTENN 3232 P1632×32 × 170 mmNeutral
↔
↔
S25S TTUNR/L-16ø25 × 250 mm | D min ≥32R right-hand
←L left-hand
→
←L left-hand
→
S32T TTUNR/L-16ø32 × 300 mm | D min ≥40R right-hand
←L left-hand
→
←L left-hand
→
S25S TT-NR/L-16ø25 × 250 mm | D min ≥32R right-hand
←L left-hand
→
←L left-hand
→
S32T TT-NR/L-16ø32 × 300 mm | D min ≥40R right-hand
←L left-hand
→
←L left-hand
→
S20R MTUNR/L-16ø20 × 200 mm | D min ≥25R right-hand
←L left-hand
→
←L left-hand
→
S25S MTUNR/L-16ø25 × 250 mm | D min ≥32R right-hand
←L left-hand
→
←L left-hand
→
S32T MTUNR/L-16ø32 × 300 mm | D min ≥40R right-hand
←L left-hand
→
←L left-hand
→
S40U MTUNR/L-16ø40 × 350 mm | D min ≥50R right-hand
←L left-hand
→
←L left-hand
→
S20R MTQNR/L-16ø20 × 200 mm | D min ≥25R right-hand
←L left-hand
→
←L left-hand
→
S25S MTQNR/L-16ø25 × 250 mm | D min ≥32R right-hand
←L left-hand
→
←L left-hand
→
S32T MTQNR/L-16ø32 × 300 mm | D min ≥40R right-hand
←L left-hand
→
←L left-hand
→
S40U MTQNR/L-16ø40 × 350 mm | D min ≥50R right-hand
←L left-hand
→
←L left-hand
→
Frequently asked questions about the TNMG 160412 insert
use, turning tool selection, 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. Once an edge becomes dull, simply rotate the insert in its pocket without changing the holder.
Holders with a 16 triangular pocket (IC 9.525 mm): for external turning TTJNR/L and MTJNR/L (entering angle 93°), TTFNR/L and TTGNR/L (90°) and neutral TTENN, MTENN (60°) with shank cross sections of 20×20–32×32 mm; for internal turning, boring bars S20R–S40U with a TTUNR/L, MTUNR/L or MTQNR/L designation suffix.
Only in corner radius: 0.4 mm is used for finishing at low feed rates, 0.8 mm is the general-purpose version, and 1.2 mm is selected for roughing at feed rates up to 0.3–0.5 mm/rev. The other dimensions (IC 9.525 mm, thickness 4.76 mm) are identical.
Grade LC 225C is carbide with a coating of CVD from group ISO P20-P45, optimized for efficient turning of structural and low-alloy steels at higher spindle speeds. High hardness and abrasion resistance make it suitable for roughing; for hardened steels above 45 HRC, use an insert with a CBN tip.
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| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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