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Carbide insert TCMT 16T308 CBN Horn
0000007830
€19.42 tax inc.
Net price: €15.79
Description
TCMT 16T308 turning insert – single-sided 60° CBN triangle
| Technical data | |
|---|---|
| Side length l | 16.5 mm |
| Insert thickness s | 3.97 mm |
| Hole diameter d1 | 4.4 mm |
| Nose radius re | 0.8 mm |
| ANSI code | TCMT 32.52 |
TCMT 16T308 CBN (borazon) indexable insert – applications and design
single-sided 60° triangle with a cubic boron nitride edge
The TCMT 16T308 turning insert is a single-sided, triangular indexable insert with cubic boron nitride (CBN, borazon) from the Korean brand Horn, designed for turning hardened steels and hard materials above 45 HRC. Shape T, an equilateral triangle with a 60° corner angle, facilitates access to the workpiece contour during longitudinal and contour turning. Positive geometry with a 7° clearance angle reduces cutting forces and uses the single top side of the insert with three corners. The rε 0.8 mm nose radius combines a good surface finish with strength of the brittle borazon edge. The countersunk hole and single-sided chip breaker (type T per ISO 1832) secure the insert and control chip flow.
Key benefits of the TCMT 16T308 borazon insert
- Cubic boron nitride (CBN) edge — hardness second only to diamond enables turning of hardened steels above 45 HRC that conventional cemented carbide cannot machine.
- Grade for ISO H materials — hard machining of tool steels, bearing steels, and carburized steels after hardening, including moderately interrupted cuts.
- Corner radius rε 0.8 mm — a versatile balance between surface finish and strength of the brittle borazon edge.
- Positive, single-sided geometry with a 7° clearance angle reduces cutting forces on rigid, hardened workpieces.
- Dimensions conform to ISO 1832: edge length 16.5 mm, IC 9.525 mm (3/8″), thickness 3.97 mm — size 16 TCMT pocket.
- The countersunk hole secures the insert centrally with a screw, facilitating quick replacement and repeatable corner positioning.
Applications and parameter selection for a CBN insert for hard machining
The TCMT 16T308 insert (also written without spaces as tcmt16t308) is suitable for hard machining of hardened components: shafts, bushings, bearing rings, and heat-treated tool steel parts. Cubic boron nitride retains its hardness and edge sharpness at high cutting zone temperatures, allowing hard turning to often replace grinding in a single pass. Calculate spindle speed using n = 1000·Vc/(π·D): for a shaft diameter of 40 mm at an approximate speed of Vc = 150 m/min, the result is approximately 1193 rpm. Borazon also tolerates moderately interrupted machining of hardened layers, provided the machine tool and clamping offer high rigidity.
The CBN edge performs best at small and medium depths of cut and moderate feed rates that protect the corner from overload. Stable, continuous contact with the material and minimal workpiece runout limit microchipping of the hard but brittle borazon tip. In hard machining, coolant is used sparingly or turning is performed dry to avoid thermal shock to the edge. These cutting conditions allow low surface roughness without a finish grinding operation. The CBN indexable inserts in this range are supplied by the Korean brand Horn.
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Application limitation
The CBN grade is only cost-effective at hardness levels above 45 HRC — for soft steels, stainless steels, and ductile materials, choose an insert made of cemented carbide, to avoid chipping of the borazon edge.
Triangular insert designation decoder according to ISO 1832
how to read the TCMT 16T308 code — positions 1–7 of the designation
Designation TCMT 16T308 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 TCMT 16T308 insert
handling, parameter selection, and hard machining
The triangle has 3 corners on the top side of the insert. Positive, single-sided geometry (7° clearance angle) means that only the top side is used — the bottom surface cannot be used as a cutting edge.
For hard machining of materials above 45 HRC: hardened steels, tool steels, bearing steels, and carburized steels after heat treatment (group ISO H). CBN is not cost-effective for soft steels, stainless steels, and ductile materials — use a cemented carbide insert.
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 heavier passes. The remaining dimensions (IC 9.525 mm, thickness 3.97 mm) are identical.
Hard machining with a borazon insert is usually performed dry or with minimal coolant to avoid thermal shock to the brittle edge. The key factor is rigidity of the machine tool, clamping, and workpiece, which limits vibration and corner microchipping.
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| 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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