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Description
SPMG 050204 carbide insert – insert for indexable drills
| Technical data | |
|---|---|
| Side length l | 5.00 mm |
| Insert thickness s | 2.38 mm |
| Corner radius rε | 0.40 mm |
| Shape | square (S) |
| Number of edges | 4 |
| Grade | H6310 (PVD-coated carbide) |
| Application | indexable drills |
H6310 indexable insert – cutting data for steel and stainless steel
conservative values for ISO groups P and M — selected based on the nominal diameter of the indexable drill
| Material | Vc [m/min] | Feed f [mm/rev] |
|---|---|---|
| PSteel | 50-75 | 0.15-0.40 |
| MStainless steel | 35-50 | 0.10-0.22 |
H6310 positive insert for indexable drills – design and applications
square insert with four cutting edges for the central position
The SPMG 050204 carbide insert is a square insert for indexable drills, designed for drilling into solid structural steel and stainless steel. The square shape provides four cutting edges, and an eleven-degree clearance angle creates a positive, single-sided geometry with reduced cutting forces. In an indexable drill, the body documentation specifies the position of the SPMG insert — central or peripheral — as well as its grade and chip breaker geometry. Grade H6310 is cemented carbide with a coating applied by PVD, or physical vapor deposition, for general-purpose use in ISO groups P and M.
Key features of the H6310 cemented carbide insert
- Four cutting edges — the square shape provides 4 corners; when a cutting edge wears out, rotate the insert in its pocket without replacing the drill body.
- Grade H6310 for ISO groups P and M — PVD-coated carbide for P20-P40 steels and M20-M40 stainless steels, for general-purpose holemaking.
- Positive geometry with a 11° clearance angle — lower axial forces and power consumption, smoother drill entry into the material.
- The mounting hole allows the insert to be secured with a screw in the body pocket, without intermediate holders or additional components.
- Dimensions according to the SPMG designation: side length 5.00 mm, thickness 2.38 mm, corner radius 0.40 mm — these parameters must be compared with the body pocket documentation.
- Operation on CNC and conventional machine tools with coolant supplied through the drill body directly to the cutting zone.
Applications and spindle speed selection for an indexable drill
The insert for indexable drills is suitable for drilling through holes and blind holes in structural steel and stainless steel. Calculate spindle speed using the formula n = 1000·Vc/(π·D), where D is the drill diameter and Vc is selected from the table for the workpiece material. For D = 20 mm and Vc = 60 m/min: n = 1000·60/(π·20) ≈ 955 rpm. The 0.40 mm corner radius is small, so it produces a rougher hole wall at a constant feed — reduce the feed for a smoother surface. Always select machining parameters based on the nominal body diameter, not the dimensions of the indexable insert itself.
An indexable drill requires rigid mounting and minimal runout, as even slight vibration causes chipping of the square carbide insert's cutting edges. If the body has coolant channels, use them to supply coolant to the cutting zone to facilitate chip removal. Reduce feed at tool entry and exit, as uneven edge contact increases the risk of chipping. Regular wear checks on the central and peripheral inserts allow replacement before hole quality deteriorates; select their specific codes and grades according to the body data sheet. The grade H6310 insert is supplied by the Korean brand Horn.
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Application limitation
Grade H6310 covers ISO groups P (steel) and M (stainless steel). It is not intended for hardened steels above 45 HRC — for harder materials, select an insert in a dedicated grade.
Square insert designation decoder according to ISO 1832
how to read the SPMG 050204 code — positions 1–7 of the designation
Designation SPMG 050204 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 – 505size 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]
505Size
l = 5 mm
IC = 5 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 050204 = square 90° · positive 11° · class M · hole and chip breaker · IC 5 mm (l 5 mm) · s 2.38 mm · rε 0.4 mm
SPMG insert compatibility in an indexable drill
guidelines for selecting an insert for the central position
| Application | Compatibility |
|---|---|
| Indexable drills with a pocket for a square insert | ✔ |
| SPMG insert in the position specified in the body documentation | ✔ |
| Drilling steel (ISO P) and stainless steel (ISO M) | ✔ |
| CNC and conventional machine tools with through-body coolant | ✔ |
| Solid carbide (VHM) and exchangeable-head drills — different design | ✗ |
| Turning and milling tool holders — this is a drilling insert | ✗ |
| Hardened steel above 45 HRC | ✗ |
| Installation without checking pocket dimensions and geometry | ✗ |
Frequently asked questions about the SPMG insert
cutting edges, materials, spindle speed, and division of work between inserts
Four — the square shape has 4 corners at 90° each. When one cutting edge wears out, rotate the insert in the body pocket to the next edge without replacing the entire indexable drill.
For steel (ISO P20-P40) and stainless steel (ISO M20-M40). It is PVD-coated cemented carbide. Do not use it for hardened steels above 45 HRC.
Using the formula n = 1000·Vc/(π·D), where D is the drill diameter. Select the cutting speed for steel from the specified range 50-75 m/min, and the feed from the range 0.15-0.40 mm/rev.
The central position operates at approximately 0–50% of the maximum cutting speed, while the peripheral position operates at approximately 50–100% and affects hole diameter and quality. The position occupied by SPMG depends on the documentation for the specific body; the same ISO shape may be approved for both positions.
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| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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