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Description
SNMG 190612 turning insert – indexable 90° square
| Technical data | |
|---|---|
| Side length l | 19.05 mm |
| Insert thickness s | 6.35 mm |
| Hole diameter d1 | 7.94 mm |
| Corner radius rε | 1.2 mm |
| ANSI code | SNMG 643 |
Cutting data for the SNMG 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 | 120-220 | 0.18 | 0.8 | 115-210 | 0.35 | 5 | 115-210 | 0.6 | 9 |
| MStainless steel | 130-225 | 0.18 | 0.8 | 125-220 | 0.35 | 5 | 115-210 | 0.6 | 9 |
Grade H6310 cemented carbide indexable insert – applications and construction
double-sided 90° square with a hole and chip breaker
The SNMG 190612 turning insert is a double-sided, square indexable insert made of H6310 grade cemented carbide, designed for turning steel and stainless steel. The S shape, a square with a 90° corner angle, provides a short, rigid cutting edge that withstands large depths of cut. Negative geometry with a 0° clearance angle allows both sides of the insert to be used — a total of eight cutting edges. The large nose radius rε 1.2 mm and thickness of 6.35 mm accommodate high feed rates and large chip cross sections during rough turning. The hole with a chip breaker on both sides (type G per ISO 1832) controls chip flow and breaking.
Key advantages of the H6310 cemented carbide insert
- Eight cutting edges — 4 corners on each of the two sides reduce the cost per cutting edge compared with single-sided inserts.
- Grade H6310 for ISO groups P and M — general-purpose PVD-coated carbide: steel (P20-P40) and stainless steel (M20-M40), and occasionally cast iron.
- Corner radius rε 1.2 mm — a strong corner for roughing and semi-finishing at feed rates up to 0.6 mm/rev.
- The 90° square shape provides a rigid, high-strength edge that withstands loads in heavy longitudinal turning and facing.
- Dimensions according to ISO 1832: edge length 19.05 mm, IC 19.05 mm (3/4″), thickness 6.35 mm — fit holders with a 19 pocket.
- Tolerance class M ensures repeatable edge positioning after indexing the insert in the pocket, without resetting the tool.
Square insert applications and cutting data selection
The SNMG 190612 insert (also written without a space as snmg190612) is suitable for rough and semi-finish turning of shafts, sleeves and forgings made of structural steels, as well as stainless steel components. Calculate spindle speed using n = 1000·Vc/(π·D): for a shaft diameter of 80 mm at Vc = 150 m/min, the result is approximately 597 rpm. When machining stainless steels, maintain a cutting speed of 130–225 m/min and a constant feed to avoid work hardening of the layer being cut. Indexable inserts made of H6310 grade cemented carbide are supplied by the Korean brand Horn.
In roughing, this insert accommodates a depth of cut ap up to 9 mm and a feed rate up to 0.6 mm/rev, making it effective for removing large machining allowances from forgings and steel castings. The rigid 90° square corner distributes cutting forces over a longer edge, reducing the risk of chipping in interrupted cuts. For finishing after a roughing pass, reduce the feed rate to approximately 0.18 mm/rev and decrease the depth of cut to improve surface finish. Rigid clamping of the workpiece and holder is more important here than with smaller inserts, because large chip cross sections generate substantial forces.
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Application limitation
Grade H6310 is not intended for steels hardened above 45 HRC — for hard turning, select the version SNMG 190612 CBN with a cubic boron nitride cutting edge.
Square insert designation decoder according to ISO 1832
how to read the SNMG 190612 code — designation positions 1–7
Designation SNMG 190612 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
holders with a size 19 square pocket — external turning
TSSNR/L 3232 P1932×32 × 170 mmR right-hand
←L left-hand
→
←L left-hand
→
TSSNR/L 4040 S1940×40 × 250 mmR right-hand
←L left-hand
→
←L left-hand
→
PSSNR/L 3232 P1932×32 × 170 mmR right-hand
←L left-hand
→
←L left-hand
→
PSSNR/L 4040 S1940×40 × 250 mmR right-hand
←L left-hand
→
←L left-hand
→
PSDNN 3232 P1932×32 × 170 mmNeutral
↔
↔
PSDNN 4040 S1940×40 × 250 mmNeutral
↔
↔
PSKNR/L 3232 P1932×32 × 170 mmR right-hand
←L left-hand
→
←L left-hand
→
PSKNR/L 4040 S1940×40 × 250 mmR right-hand
←L left-hand
→
←L left-hand
→
PSBNR/L 3232 P1932×32 × 170 mmR right-hand
←L left-hand
→
←L left-hand
→
PSBNR/L 4040 S1940×40 × 250 mmR right-hand
←L left-hand
→
←L left-hand
→
PSSNR/L-PH 3232 P1932×32 × 170 mmR right-hand
←L left-hand
→
←L left-hand
→
PSDNN-PH 3232 P1932×32 × 170 mmNeutral
↔
↔
PSKNR/L-PH 3232 P1932×32 × 170 mmR right-hand
←L left-hand
→
←L left-hand
→
PSBNR/L-PH 3232 P1932×32 × 170 mmR right-hand
←L left-hand
→
←L left-hand
→
Frequently asked questions about the SNMG 190612 insert
use, turning tool selection, and turning parameters
Eight — a square has 4 corners per side, and the negative geometry (0° clearance angle) allows both sides of the insert to be used. Once an edge becomes dull, simply rotate the insert in its pocket without changing the holder.
Holders with a square 19 pocket (IC 19.05 mm) for external turning: right-hand and left-hand TSSNR/L, PSSNR/L, PSKNR/L and PSBNR/L and neutral PSDNN, in shank cross sections of 32×32 and 40×40 mm. Variants are also available with the suffix -PH in a shank cross section of 32×32 mm.
Mainly in nose radius rε: 0.8 mm is suitable for more precise turning at lower feed rates, 1.2 mm is a general-purpose and roughing variant, while 1.6 mm is selected for the heaviest roughing passes. The remaining dimensions (IC 19.05 mm, thickness 6.35 mm) are identical.
Yes — grade H6310 covers group ISO M20-M40. Maintain a cutting speed of 130–225 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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