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Description
TCMT 16T304 turning insert – indexable 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 | 0.4 mm |
| ANSI code | TCMT 32.51 |
Cutting data for the TCMT insert for steel and stainless steel
finishing, semi-finishing and roughing — ISO P and M groups
| Material | Finishing | Semi-finishing | Roughing | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 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 |
Grade H6310 cemented carbide indexable insert – applications and construction
single-sided 60° triangle with positive geometry and a chip breaker
The TCMT 16T304 turning insert is a single-sided, triangular indexable insert made of grade H6310 cemented carbide, designed for turning steel and stainless steel. The T shape denotes an equilateral triangle with a corner angle of 60°, providing easy access to contours during longitudinal turning, facing, and profiling. Positive geometry with a 7° clearance angle (letter C) reduces cutting resistance, so the insert performs well on slender shafts and with limited spindle power. Three corners on one side provide three cutting edges, while the small nose radius rε of 0.4 mm makes it suitable for finishing and semi-finishing. The countersunk hole secured with a central screw and the single-sided chip breaker control chip flow and breaking during machining.
Grade H6310 is cemented carbide with a thin, hard PVD coating that increases abrasion resistance and helps maintain the cutting edge at high temperatures. Its application range includes structural and engineering steels in ISO group P20-P40 and austenitic stainless steel in group M20-M40, as well as occasional use on cast iron. Tolerance class M ensures repeatable edge positioning after indexing the insert in its pocket, reducing tool setup time. This cemented carbide insert is compatible with both conventional lathes and CNC machine tools.
Key advantages of the H6310 cemented carbide insert
- Three cutting edges — 3 corners of 60° each on one side; once an edge becomes dull, simply index the insert in its pocket without removing the holder.
- Grade H6310 for ISO groups P and M — PVD-coated carbide: steel (P20-P40) and stainless steel (M20-M40), occasionally also cast iron.
- Positive geometry with a 7° angle — lower cutting forces and lighter cutting on lower-powered machine tools and thin workpieces.
- The nose radius rε of 0.4 mm provides a good surface finish when finish turning steel and stainless steel.
- The countersunk hole with screw clamping (letter T) ensures secure, repeatable seating 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 16T304 insert (also written without spaces as tcmt16t304) performs well when finishing 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 40 mm at Vc = 300 m/min, the result is approximately 2387 rpm. For stainless steels, maintain a cutting speed of 125–260 m/min and a constant feed rate to limit work hardening of the layer being cut. For finishing, select a depth of cut ap of approximately 0.11–0.35 mm and a feed rate of 0.06–0.11 mm/rev, increasing them only for semi-finishing. Grade H6310 indexable inserts for turning tools are supplied by the Korean brand Horn.
▲
Application limitation
Grade H6310 is not intended for steels hardened above 45 HRC — for hard turning, choose a cubic boron nitride insert CBN. The small radius rε 0.4 mm and single working side make the insert suitable TCMT 16T304 primarily for finishing, not roughing.
Triangular insert designation decoder according to ISO 1832
how to read the TCMT 16T304 code — positions 1–7 of the designation
Designation TCMT 16T304 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
turning tool holders compatible with the insert — external and internal turning
STJCR/L 1616 H1616×16 × 100 mmR right-hand
←L left-hand
→
←L left-hand
→
STJCR/L 2020 K1620×20 × 125 mmR right-hand
←L left-hand
→
←L left-hand
→
STJCR/L 2525 M1625×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
STJCR/L 3232 P1632×32 × 170 mmR right-hand
←L left-hand
→
←L left-hand
→
STGCR/L 1616 H1616×16 × 100 mmR right-hand
←L left-hand
→
←L left-hand
→
STGCR/L 2020 K1620×20 × 125 mmR right-hand
←L left-hand
→
←L left-hand
→
STGCR/L 2525 M1625×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
STGCR/L 3232 P1632×32 × 170 mmR right-hand
←L left-hand
→
←L left-hand
→
STFCR/L 1616 H1616×16 × 100 mmR right-hand
←L left-hand
→
←L left-hand
→
STFCR/L 2020 K1620×20 × 125 mmR right-hand
←L left-hand
→
←L left-hand
→
STFCR/L 2525 M1625×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
STFCR/L 3232 P1632×32 × 170 mmR right-hand
←L left-hand
→
←L left-hand
→
S16P STUCR/L-16Ø16 | Ømin 21 mm | L=170R right-hand
←L left-hand
→
←L left-hand
→
S20R STUCR/L-16Ø20 | Ømin 25 mm | L=200R right-hand
←L left-hand
→
←L left-hand
→
S25S STUCR/L-16Ø25 | Ømin 32 mm | L=250R right-hand
←L left-hand
→
←L left-hand
→
S32T STUCR/L-16Ø32 | Ømin 40 mm | L=300R right-hand
←L left-hand
→
←L left-hand
→
S40U STUCR/L-16Ø40 | Ømin 50 mm | L=350R right-hand
←L left-hand
→
←L left-hand
→
S16P STFCR/L-16Ø16 | Ømin 21 mm | L=170R right-hand
←L left-hand
→
←L left-hand
→
S20R STFCR/L-16Ø20 | Ømin 25 mm | L=200R right-hand
←L left-hand
→
←L left-hand
→
S25S STFCR/L-16Ø25 | Ømin 32 mm | L=250R right-hand
←L left-hand
→
←L left-hand
→
S32T STFCR/L-16Ø32 | Ømin 40 mm | L=300R right-hand
←L left-hand
→
←L left-hand
→
S40U STFCR/L-16Ø40 | Ømin 50 mm | L=350R right-hand
←L left-hand
→
←L left-hand
→
S16P ST-CR/L-16Ø16 | Ømin 21 mm | L=170R right-hand
←L left-hand
→
←L left-hand
→
S20R ST-CR/L-16Ø20 | Ømin 25 mm | L=200R right-hand
←L left-hand
→
←L left-hand
→
S25S ST-CR/L-16Ø25 | Ømin 32 mm | L=250R right-hand
←L left-hand
→
←L left-hand
→
S32T ST-CR/L-16Ø32 | Ømin 40 mm | L=300R right-hand
←L left-hand
→
←L left-hand
→
S40U ST-CR/L-16Ø40 | Ømin 50 mm | L=350R right-hand
←L left-hand
→
←L left-hand
→
Frequently asked questions about the TCMT 16T304 insert
use, turning tool selection, and turning parameters
Three — the triangle has 3 corners, and the positive, single-sided geometry (7° clearance angle) uses only one side of the insert. Once a corner becomes dull, simply index the insert in its pocket without changing the 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. The letter R indicates the right-hand version, L the left-hand version.
Mainly in the nose radius: 0.4 mm (code 04) provides a sharper corner for finishing at low feed rates and a better surface finish, while 0.8 mm (code 08) is a general-purpose version with a stronger corner. The remaining dimensions — IC 9.525 mm and thickness 3.97 mm — are identical.
Yes — grade H6310 covers group ISO M20-M40. Maintain a cutting speed of 125–260 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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| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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