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Description
SCMT 120404 turning insert – single-sided 90° square
| Technical data | |
|---|---|
| Side length l | 12.7 mm |
| Insert thickness s | 4.76 mm |
| Hole diameter d1 | 5.5 mm |
| Corner radius rε | 0.4 mm |
| ANSI code | SCMT 431 |
Cutting data for the SCMT 120404 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 | 130-200 | 0.05-0.15 | 0.1-1 | 130-200 | 0.12-0.21 | 0.5-3 | 170-190 | 0.12-0.21 | 0.5-3 |
| MStainless steel | 70-100 | 0.05-0.15 | 0.1-1 | 70-100 | 0.12-0.21 | 0.5-3 | 55-75 | 0.12-0.21 | 0.5-3 |
Square H6018 carbide insert – applications and design
single-sided 90° square with a hole and chip breaker
The SCMT 120404 turning insert is a single-sided, square indexable insert made of grade H6018 cemented carbide, designed for turning steel and stainless steel. Shape S, a square with a 90° corner angle, provides a strong, rigid edge suitable for longitudinal turning and facing. The positive geometry with a 7° clearance angle reduces cutting forces and also works well with less rigid clamping setups. Four corners on one face provide four cutting edges, and the central countersunk hole allows screw clamping for rigid, repeatable seating in the tool holder pocket.
Key advantages of the H6018 cemented carbide insert
- Four cutting edges — 4 corners of 90° each on one side of a single-sided insert; when a corner is worn, simply rotate the insert in the pocket.
- Grade H6018 for ISO groups P and M — general-purpose PVD-coated carbide for steel (P20-P40) and stainless steel (M20-M40).
- Positive 7° geometry — lower cutting forces and power consumption, beneficial for slender workpieces and lower-powered machine tools.
- The nose radius rε of 0.4 mm supports finishing and good surface quality at low feed rates.
- The countersunk hole enables rigid screw clamping of the insert in tool holders with a square 12 pocket.
- Tolerance class M ensures repeatable edge positioning after indexing the insert in the holder pocket.
Square insert applications and cutting data selection
The SCMT 120404 insert (also written without spaces as scmt120404) 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 with a diameter of 40 mm at Vc = 170 m/min, the result is approximately 1353 rpm. For stainless steel, maintain a cutting speed of 70–100 m/min and a constant feed rate to limit work hardening of the layer being cut. Grade H6018 indexable inserts are supplied by the Korean brand Horn.
The nose radius rε of 0.4 mm makes this cutting insert suitable for finishing and semi-finishing — it produces a smooth surface at feed rates of 0.05–0.15 mm/rev. For heavier roughing within the same SCMT 1204 family, choose a version with a larger nose radius that better withstands high feed rates. As an insert for indexable turning tools, SCMT 120404 fits tool holders with a square 12 pocket for external turning. PVD-coated grade H6018 covers ISO groups P and M, allowing one insert to handle both steel and stainless steel in typical turning insert applications.
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Application limitation
Corner radius rε 0.4 mm is small — the insert performs best in finishing and semi-finishing. During rough turning at high feed rates, the corner is susceptible to chipping; for heavier roughing, choose a version with a larger nose radius.
Square insert designation decoder according to ISO 1832
how to read the SCMT 120404 code — positions 1–7 of the designation
Designation SCMT 120404 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 12 square pocket — external turning of steel and stainless steel
SSDCN 1616 H1216×16 × 100 mmNeutral
↔
↔
SSDCN 2020 K1220×20 × 125 mmNeutral
↔
↔
SSDCN 2525 M1225×25 × 150 mmNeutral
↔
↔
SSSCR/L 1616 H1216×16 × 100 mmR right-hand
←L left-hand
→
←L left-hand
→
SSSCR/L 2020 K1220×20 × 125 mmR right-hand
←L left-hand
→
←L left-hand
→
SSSCR/L 2525 M1225×25 × 150 mmR right-hand
←L left-hand
→
←L left-hand
→
Frequently asked questions about the SCMT 120404 insert
use, turning tool selection, and turning parameters
Four — a square has 4 corners, and the positive, single-sided geometry (7° clearance angle) allows cutting with only one face of the insert. When a corner becomes dull, rotate the insert in the pocket until all four edges are worn.
Holders with a square 12 pocket (IC 12.7 mm) for external turning: neutral SSDCN and right-hand and left-hand SSSCR/L, in cross sections of 16×16, 20×20, and 25×25 mm. All secure the insert with a screw through the central hole.
Only in corner radius: 0.4 mm is used for finishing and semi-finishing at low feed rates, while 0.8 mm is a more versatile version that withstands higher feed rates in roughing. The other dimensions (IC 12.7 mm, thickness 4.76 mm) are identical within the SCMT 1204 family.
Yes — grade H6018 covers group ISO M (stainless steel). Maintain a cutting speed of 70–100 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 | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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