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Description
SCMT 09T308 turning insert – 90° square with positive geometry
| Technical data | |
|---|---|
| Side length l | 9.525 mm |
| Insert thickness s | 3.97 mm |
| Hole diameter d1 | 4.4 mm |
| Corner radius rε | 0.8 mm |
| ANSI code | SCMT 32.52 |
Cutting data for the SCMT 09T308 insert for steel and stainless steel
finishing and semi-finishing — ISO groups P and M
| Material | Finishing | Semi-finishing | ||||
|---|---|---|---|---|---|---|
| Vc [m/min] | Feed f [mm/rev] | ap [mm] | Vc [m/min] | Feed f [mm/rev] | ap [mm] | |
| PSteel | 180-300 | 0.05-0.2 | 0.1-1.65 | 180-300 | 0.12-0.21 | 0.5-3 |
| MStainless steel | 90-150 | 0.05-0.2 | 0.1-1.65 | 90-150 | 0.12-0.21 | 0.5-3 |
Grade H6310 cemented carbide indexable insert – applications and construction
single-sided 90° square with positive geometry and a chip breaker
The SCMT 09T308 turning insert is a single-sided, square indexable insert made of grade H6310 cemented carbide, designed for turning steel and stainless steel. Shape S, a square with a 90° corner angle, provides a strong, durable corner that withstands loads during longitudinal turning and facing. The positive geometry with a 7° clearance angle (letter C) reduces cutting forces, making the insert suitable for less rigid workpieces, boring, and smaller lathes. Four corners are usable on one side, providing four cutting edges. The rε 0.8 mm corner radius combines a good surface finish with edge strength at feed rates of 0.12–0.21 mm/rev.
Key features of the H6310 cemented carbide insert
- Four cutting edges — 4 corners on one side of the insert; the positive, single-sided design uses only the upper rake face.
- 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 α 7° — lower forces and power consumption, beneficial for slender workpieces and internal turning.
- Corner radius rε 0.8 mm — a versatile balance between surface finish and edge strength.
- Dimensions according to ISO 1832: side length 9.525 mm, IC 9.525 mm (3/8″), thickness 3.97 mm — compatible with holders with a size 09 square insert pocket.
- The countersunk hole and single-sided chip breaker control chip flow and chip breaking when turning steel and stainless steel.
Square insert applications and cutting data selection
The SCMT 09T308 insert (also written without spaces as scmt09t308) is suitable for turning shafts, bushings, and flanges made of structural steels, as well as stainless steel components. Calculate spindle speed using the formula n = 1000·Vc/(π·D): for a shaft diameter of 50 mm at Vc = 200 m/min, the result is approximately 1273 rpm. For stainless steels, maintain a cutting speed of 90–150 m/min and a constant feed rate to avoid work hardening of the layer being cut. The positive geometry and countersunk mounting hole facilitate chip evacuation during finishing and semi-finishing. Grade H6310 indexable inserts with a PVD coating are supplied by the Korean brand Horn.
Grade H6310 is a versatile carbide with a PVD coating, covering ISO groups P20-P40 and M20-M40. The coating increases resistance to wear and heat in the cutting zone, while the carbide substrate retains its resistance to impact loads. This allows one insert to cover unalloyed and alloy steels as well as more difficult-to-machine austenitic stainless steels. The SCMT insert is secured in the holder pocket with a central screw, allowing quick indexing after a corner wears out without changing the dimensional setting.
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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.
Square insert designation decoder according to ISO 1832
how to read the SCMT 09T308 code — positions 1–7 of the designation
Designation SCMT 09T308 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
tool holders with a size 09 square pocket — external turning of steel and stainless steel
SSDCN 1212 F0912×12 × 80 mmNeutral
↔
↔
SSDCN 1616 H0916×16 × 100 mmNeutral
↔
↔
SSDCN 2020 K0920×20 × 125 mmNeutral
↔
↔
SSDCN 2525 M0925×25 × 150 mmNeutral
↔
↔
SSSCR/L 1212 F0912×12 × 80 mmR right-hand
←L left-hand
→
←L left-hand
→
SSSCR/L 1616 H0916×16 × 100 mmR right-hand
←L left-hand
→
←L left-hand
→
SSSCR/L 2020 K0920×20 × 125 mmR right-hand
←L left-hand
→
←L left-hand
→
SSSCR/L 2525 M0925×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
Frequently asked questions about the SCMT 09T308 insert
use, turning tool selection, and turning parameters
Four — a square has 4 corners, but the positive, single-sided geometry (7° clearance angle) allows only one side of the insert to be used. When a corner wears out, simply index the insert in its pocket without changing the holder.
Holders with a square 09 pocket (IC 9.525 mm) for external turning: neutral SSDCN and right-hand and left-hand SSSCR/L, with cross sections from 12×12 to 25×25 mm. The insert is secured in the pocket with a central screw.
Only in corner radius: 0.4 mm (code 04) is used for finishing at low feed rates, while 0.8 mm (code 08) is a general-purpose version with a stronger corner. The other dimensions — IC 9.525 mm and thickness 3.97 mm — remain identical.
Yes — grade H6310 covers group ISO M20-M40. Maintain a cutting speed of 90–150 m/min, a constant feed, and continuous cooling: austenitic steel dissipates heat poorly and work-hardens when cutting is too slow.
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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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