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Carbide insert TCMT 16T308 H6310 Horn - Carbide insert milling machine
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  • Carbide insert TCMT 16T308 H6310 Horn - Carbide insert milling machine
  • Carbide insert TCMT 16T308 H6310 Horn - Carbide insert milling machine - nr. 1
Horn

Carbide insert TCMT 16T308 H6310 Horn

Horn Horn
0000006146
€4.53 tax inc.

Net price: €3.68

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Description

TCMT 16T308 turning insert – single-sided 60° triangle

Technical data
Side length l 16.5 mm
Insert thickness s 3.97 mm
Hole diameter d1 4.4 mm
Corner radius rε 0.8 mm
ANSI code TCMT 32.52
TCMT 16T308 indexable turning insert made of H6310 cemented carbide, single-sided 60° triangle with a hole, countersink, and chip breaker

Cutting data for the TCMT 16T308 insert for steel and stainless steel

finishing, semi-finishing and roughing — ISO P and M groups

MaterialFinishingSemi-finishingRoughing
Vc [m/min]Feed f [mm/rev]ap [mm]Vc [m/min]Feed f [mm/rev]ap [mm]Vc [m/min]Feed f [mm/rev]ap [mm]
PSteel 250-350 0.06 0.11 180-270 0.11 0.35 170-220 0.23 2
MStainless steel 125-260 0.06 0.11 100-220 0.11 0.35 80-200 0.23 2

H6310 carbide turning insert – applications and design

single-sided 60° triangle with positive geometry

The TCMT 16T308 turning insert is a single-sided triangular indexable insert made of grade H6310 cemented carbide, designed for turning steel and stainless steel. Shape T denotes an equilateral triangle with a 60° corner angle, providing easier access to the workpiece contour during longitudinal turning and facing. The letter C in the designation indicates a positive clearance angle of 7°, allowing the geometry to cut with lower resistance. The insert has three corners on one side, providing three cutting edges. The nose radius rε of 0.8 mm combines a good surface finish with edge strength at feeds of 0.11–0.23 mm/rev.

Grade H6310 is a general-purpose cemented carbide with a PVD coating, covering ISO groups P20-P40 and M20-M40. It is suitable for machining unalloyed and alloy steels, austenitic and acid-resistant stainless steels, and occasionally cast iron. The PVD coating increases edge resistance to abrasive wear and allows operation at both low and high cutting speeds. This enables a single insert to cover a wide range of materials in one-off and small-batch production.

Key features of the H6310 cemented carbide insert

  • Three cutting edges — a single-sided insert with three 60° corners; once an edge becomes dull, simply rotate the insert in its pocket without changing the tool holder.
  • Grade H6310 for ISO groups P and M — PVD-coated carbide for steel (P20-P40) and stainless steel (M20-M40), and occasionally cast iron.
  • Positive geometry with a 7° clearance angle — lower cutting forces and less tendency to vibrate on slender, less rigid workpieces.
  • The nose radius rε of 0.8 mm is a general-purpose option combining surface finish with edge strength between roughing and finishing operations.
  • 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 3.97 mm — fit holders with a 16 pocket.

Applications and parameter selection for the triangular insert

The TCMT 16T308 insert (also written without a space as tcmt16t308) is suitable for turning shafts, bushings, and flanges made of structural steels, as well as stainless steel components. Calculate spindle speed using n = 1000·Vc/(π·D): for a shaft diameter of 50 mm at Vc = 250 m/min, the result is approximately 1592 rpm. For stainless steel, maintain a cutting speed of 80–260 m/min and a constant feed to limit work hardening of the layer being cut and excessive heat generation. Select the depth of cut ap according to setup rigidity — from 0.11 mm for precision machining to 2 mm for roughing. The countersunk hole allows the insert to be secured with a center screw, while the single-sided chip breaker controls chip flow and breaking. Indexable inserts in grade H6310 are supplied by the Korean brand Horn.

▲
Application limitation

Grade H6310 is not intended for steels hardened above 45 HRC — for hard turning, choose an insert with a cubic boron nitride cutting edge CBN or a grade for hardened materials.

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.

ISO 1832 designation decoder — how to read the code

1Tshape 2Cangle α 3Mtolerance 4Ttype – 516size 6T3thickness 708radius rε

Positions 1–4 · ISO code

1TShape

60° triangle

3 corners of 60° per side

2CClearance angle

α = 7°

positive, single-sided

3MTolerance

Class M (intermediate)

IC ±0.05 · thickness ±0.13 mm

4TType

Countersunk hole + chip breaker

countersink 40–60°, single-sided chip breaker

Positions 5–7 · dimensions [mm]

516Size

l = 16.5 mm

IC = 9.525 mm · 3/8″

6T3Thickness

s = 3.97 mm

between rake faces

708Corner radius

rε = 0.8 mm

code ÷ 10 → radius in mm

✓ 3 corners × 1 side = 3 cutting edges

Full designation: TCMT 16T308 = 60° triangle · 7° positive · class M · countersunk hole and chip breaker · IC 9.525 mm (l 16.5 mm) · s 3.97 mm · rε 0.8 mm

Compatible turning tools

holders with a 16 triangular pocket — external and internal turning

STJCR/L 1616 H1616×16 × 100 mmR right-hand
←L left-hand
→
STJCR/L 2020 K1620×20 × 125 mmR right-hand
←L left-hand
→
STJCR/L 2525 M1625×25 × 150 mmR right-hand
←L left-hand
→
STJCR/L 3232 P1632×32 × 170 mmR right-hand
←L left-hand
→
STGCR/L 1616 H1616×16 × 100 mmR right-hand
←L left-hand
→
STGCR/L 2020 K1620×20 × 125 mmR right-hand
←L left-hand
→
STGCR/L 2525 M1625×25 × 150 mmR right-hand
←L left-hand
→
STGCR/L 3232 P1632×32 × 170 mmR right-hand
←L left-hand
→
STFCR/L 1616 H1616×16 × 100 mmR right-hand
←L left-hand
→
STFCR/L 2020 K1620×20 × 125 mmR right-hand
←L left-hand
→
STFCR/L 2525 M1625×25 × 150 mmR right-hand
←L left-hand
→
STFCR/L 3232 P1632×32 × 170 mmR right-hand
←L left-hand
→
S16P STUCR/L-16Ø16 | Ømin 21 mm | L=170R right-hand
←L left-hand
→
S20R STUCR/L-16Ø20 | Ømin 25 mm | L=200R right-hand
←L left-hand
→
S25S STUCR/L-16Ø25 | Ømin 32 mm | L=250R right-hand
←L left-hand
→
S32T STUCR/L-16Ø32 | Ømin 40 mm | L=300R right-hand
←L left-hand
→
S40U STUCR/L-16Ø40 | Ømin 50 mm | L=350R right-hand
←L left-hand
→
S16P STFCR/L-16Ø16 | Ømin 21 mm | L=170R right-hand
←L left-hand
→
S20R STFCR/L-16Ø20 | Ømin 25 mm | L=200R right-hand
←L left-hand
→
S25S STFCR/L-16Ø25 | Ømin 32 mm | L=250R right-hand
←L left-hand
→
S32T STFCR/L-16Ø32 | Ømin 40 mm | L=300R right-hand
←L left-hand
→
S40U STFCR/L-16Ø40 | Ømin 50 mm | L=350R right-hand
←L left-hand
→
S16P ST-CR/L-16Ø16 | Ømin 21 mm | L=170R right-hand
←L left-hand
→
S20R ST-CR/L-16Ø20 | Ømin 25 mm | L=200R right-hand
←L left-hand
→
S25S ST-CR/L-16Ø25 | Ømin 32 mm | L=250R right-hand
←L left-hand
→
S32T ST-CR/L-16Ø32 | Ømin 40 mm | L=300R right-hand
←L left-hand
→
S40U ST-CR/L-16Ø40 | Ømin 50 mm | L=350R right-hand
←L left-hand
→

Frequently asked questions about the TCMT 16T308 insert

use, turning tool selection, and turning parameters

Three — the triangle has 3 corners, while the positive geometry (7° clearance angle) makes the insert single-sided, with only the top side used for cutting. Once a corner becomes dull, simply rotate the insert in its pocket without changing the tool holder.

Holders with a 16 triangular pocket (IC 9.525 mm): for external turning STJCR/L, STGCR/L and STFCR/L with cross sections of 16×16–32×32 mm; for internal turning, boring bars S16P–S40U with an STUCR/L, STFCR/L, or ST-CR/L head. R versions are right-hand, and L versions are left-hand.

Only in corner radius: 0.4 mm (16T304) is used for finishing at low feeds, 0.8 mm (16T308) is a general-purpose version, while 1.2 mm (16T312) is selected for roughing at higher feeds. The remaining dimensions (IC 9.525 mm, thickness 3.97 mm) are identical.

Yes — grade H6310 covers group ISO M20-M40. Maintain a cutting speed of 80–260 m/min, a constant feed, and continuous emulsion cooling: austenitic steel conducts heat poorly and work-hardens when cutting is too slow.

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Carbide insert TCMT 16T308 H6310 Horn

Carbide insert TCMT 16T308 H6310 Horn

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