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Description
SPMG 060204 carbide insert – for indexable drills
| Technical data | |
|---|---|
| Side length l | 6.00 mm |
| Insert thickness s | 2.38 mm |
| Corner radius rε | 0.40 mm |
| ANSI code | SPMG 21.51 |
| Shape | S — square 90° |
| Grade | H6310 (PVD) |
| Application | indexable drills |
Cutting data for the SPMG H6310 insert
drilling steel and stainless steel — ISO groups P and M
| Material | Vc [m/min] | Feed f [mm/rev] |
|---|---|---|
| PSteel | 50-75 | 0.15-0.40 |
| MStainless steel | 35-50 | 0.10-0.22 |
SPMG insert for indexable drills – design and operation
square S shape, four cutting edges, PVD-coated carbide
The SPMG 060204 carbide insert is a square insert designed for indexable drills, meaning drills with replaceable cutting inserts. Shape S denotes a square with an included corner angle of 90°, providing four cutting edges on one side. The insert operates in a steel drill body, which typically holds two inserts: center and peripheral. The side length is 6.00 millimeters, the thickness is 2.38 millimeters, and the corner radius is 0.40 millimeters. Grade H6310 is cemented carbide with a coating of PVD (physical vapor deposition), suitable for general use in steel and stainless steel. The coating reduces abrasive wear of the cutting edges when drilling steel and stainless steel. The square profile provides four successive working corners on a single insert.
Key features of the square carbide insert
- Four edges per side — the square S shape provides 4 cutting corners; when an edge becomes dull, index the insert in its pocket without replacing the entire drill.
- Grade H6310 with PVD coating — carbide for steel (P20-P40) and stainless steel (M20-M40).
- Replaceable inserts — after all four corners have been used, replace the insert without replacing the entire drill body.
- Drilling without spot drilling — the geometry of the two inserts guides the drill automatically through the material.
- The parameters in the table are selected according to the nominal drill diameter, not the size of the insert itself.
- Thickness 2.38 mm and corner radius 0.40 mm match the SPMG 06 size.
Parameter selection and operating guidelines for an indexable drill
This insert for indexable drills is suitable for drilling holes with diameters greater than a dozen or so millimeters on CNC machine tools. Select cutting parameters based on the nominal drill diameter, not the insert itself. Calculate spindle speed using the formula n = 1000·Vc/(π·D). For a drill diameter of 25 mm at a cutting speed of Vc = 60 m/min, the result is n = 1000·60/(π·25), or approximately 764 rpm. The indexable drill is self-guiding thanks to the geometry of its two inserts and requires no spot drilling.
The center insert operates close to the drill axis, where cutting speed drops to zero and the material is displaced rather than cut. The peripheral insert determines the hole diameter and surface finish. Supply pressurized coolant through the internal channels in the body to flush chips out of the hole. Reduce the feed at drill entry and exit, when both inserts are not yet fully engaged with the material. Rigid clamping of the body reduces vibration and protects the cutting edges from chipping. Grade H6310 inserts are supplied by the Korean brand Horn.
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Application limitation
Grade H6310 is not intended for hardened steels above 45 HRC. The center and peripheral inserts must not be interchanged — they perform different functions in the drill body.
Square insert designation decoder according to ISO 1832
how to read the SPMG 060204 code — positions 1–7 of the designation
Designation SPMG 060204 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
1Sshape 2Pangle α 3Mtolerance 4Gtype – 506size 602thickness 704radius rε
Positions 1–4 · ISO code
1SShape
Square 90°
4 corners of 90° per side
2PClearance angle
α = 11°
positive, single-sided
3MTolerance
Class M (intermediate)
IC ±0.05 · thickness ±0.13 mm
4GType
Hole + chip breaker
chip breaker on both sides
Positions 5–7 · dimensions [mm]
506Size
l = 6 mm
IC = 6 mm (square: IC = l)
602Thickness
s = 2.38 mm
between rake faces
704Corner radius
rε = 0.4 mm
code ÷ 10 → radius in mm
✓ 4 corners × 1 side = 4 cutting edges
Full designation: SPMG 060204 = square 90° · positive 11° · class M · hole and chip breaker · IC 6 mm (l 6 mm) · s 2.38 mm · rε 0.4 mm
SPMG H6310 insert compatibility
workpiece materials and mounting in an indexable drill
| Material / application | SPMG H6310 insert |
|---|---|
| Structural and alloy steel (ISO P) | ✔ |
| Stainless steel (ISO M) | ✔ |
| Cast iron (ISO K) — outside the confirmed H6310 range | ✗ |
| Aluminum and nonferrous metals (ISO N) — outside the confirmed H6310 range | ✗ |
| Indexable drill with a pocket for an SPMG 06 insert | ✔ |
| Hardened steel above 45 HRC | ✗ |
| Interchanging the center and peripheral insert positions | ✗ |
Frequently asked questions about the SPMG 060204 insert
drill selection, number of cutting edges, materials, and rotational speed
Indexable drills with a pocket for the insert SPMG 06. This type of drill typically uses two inserts — center and peripheral — and their grade and geometry must match their position in the body.
Four — the square S shape has 4 corners at 90° each, and the insert uses one side. When a corner becomes dull, index the insert in its pocket to the next edge without replacing the entire drill.
Steel (Vc 50-75 m/min) and stainless steel (35-50 m/min). Grade H6310 covers groups P20-P40 and M20-M40 and is not intended for steels hardened above 45 HRC.
Use the formula n = 1000·Vc/(π·D), where D is the drill diameter. For D = 25 mm and Vc = 60 m/min the result is approximately 764 rpm. Base cutting speed on the drill diameter, not the insert itself.
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| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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