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Description
Carbide insert SPMG 07T308 – for indexable drills
| Technical data | |
|---|---|
| Insert shape | square (S) |
| Side length l | 7.94 mm |
| Insert thickness s | 3.97 mm |
| Corner radius rε | 0.8 mm |
| Carbide grade | H6310 (PVD) |
| Type | for indexable drills |
SPMG H6310 insert – cutting data
conservative vc and feed ranges for steel (P) and stainless steel (M)
| Material | Vc [m/min] | Feed f [mm/rev] |
|---|---|---|
| PSteel | 50-75 | 0.15-0.40 |
| MStainless steel | 35-50 | 0.10-0.22 |
H6310 insert for indexable drills – design and operating guidelines
square center insert for an indexable drill
The SPMG 07T308 carbide insert is a square insert designed for indexable drills — tools with replaceable inserts for drilling larger-diameter holes on CNC machine tools. The body of this type of drill typically holds two different inserts: a center insert located close to the axis of rotation and a peripheral insert that determines the hole diameter and surface finish. The body documentation specifies the position of this insert in a particular drill. The distinction between center and peripheral positions is functional, but the same ISO shape may be approved for both positions, with different grades or chip breaker geometries. The insert is made of grade H6310 cemented carbide with a PVD coating applied by physical vapor deposition. This general-purpose grade covers steel in ISO group P and stainless steel in group M. The side length is 7.94 mm, the thickness is 3.97 mm, and the corner radius is 0.8 mm.
Key advantages of the H6310 cemented carbide insert
- Four cutting edges — the square insert provides 4 corners; when an edge becomes dull, index it in its pocket without replacing the entire drill.
- Grade H6310 with PVD coating — for steel P20-P40 and stainless steel M20-M40, with resistance to heat and abrasive wear.
- Replaceable inserts instead of resharpening — allow the working edge to be renewed without replacing the entire drill body.
- The square shape provides a strong, durable corner that resists impact loads at drill entry.
- The insert hole interfaces with its designated pocket in the drill body; confirm the position in the body documentation.
- If the body data sheet specifies this insert for the center position, it operates close to the axis and carries a large share of the axial load.
Applications and selection of drilling parameters
This insert for indexable drills is suitable for drilling holes in structural steel and stainless steel. Select parameters according to the nominal drill diameter and the operating conditions of the center position. Calculate spindle speed using the formula n = 1000·vc/(π·D), where D denotes the drill diameter and vc is selected from the source range for the workpiece material. For example, for D = 20 mm and vc = 60 m/min: n = 1000·60/(π·20) ≈ 955 rpm. Base the feed on the tool diameter, not the insert itself.
An indexable drill requires rigid clamping and coolant delivered through the body directly to the cutting zone — this is essential for reliable chip removal from deep holes. Reduce the feed when entering and exiting the material to relieve the cutting edges and reduce the risk of corner chipping. The division of work between the inserts is deliberate: the center insert cuts at very low speed close to the axis and withstands high axial forces, while the peripheral insert operates at full speed and determines the hole diameter and surface finish. Select paired inserts with the grade and geometry recommended for the specific body; its documentation specifies the ISO shape for each position.
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Application limitation
Grade H6310 is not intended for hardened steels above 45 HRC. Determine the position of the square S insert and the matching insert according to the body documentation. Select the recommended grade and geometry for both positions; do not interchange them without confirmation in the drill data sheet.
Square insert designation decoder according to ISO 1832
how to read the SPMG 07T308 code — positions 1–7 of the designation
Designation SPMG 07T308 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 – 507size 6T3thickness 708radius 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]
507Size
l = 7.94 mm
IC = 7.94 mm (square: IC = l)
6T3Thickness
s = 3.97 mm
between rake faces
708Corner radius
rε = 0.8 mm
code ÷ 10 → radius in mm
✓ 4 corners × 1 side = 4 cutting edges
Full designation: SPMG 07T308 = square 90° · positive 11° · class M · hole and chip breaker · IC 7.94 mm (l 7.94 mm) · s 3.97 mm · rε 0.8 mm
SPMG H6310 insert compatibility
where to use it and what to avoid
Applications and limitations:
| Rating | Application or limitation |
|---|---|
| ✔ | Indexable drill bodies with a pocket for the insert SPMG 07 |
| ✔ | Operation in the center or peripheral position, if specified in the data sheet for the particular body |
| ✔ | Drilling structural steel (P) and stainless steel (M) on CNC machine tools |
| ✔ | Seating in its designated pocket in the drill body |
| ✗ | Arbitrary assignment of position or grade without checking the body documentation |
| ✗ | Solid carbide (VHM) drills — without replaceable inserts |
| ✗ | Hardened steels above 45 HRC — outside the range of grade H6310 |
| ✗ | Exchangeable-head drills — the entire head is replaced, not just the insert |
Frequently asked questions about the SPMG 07T308 insert
tools, cutting edges, materials, and spindle speed selection
For indexable drills — bodies with replaceable inserts for drilling larger diameters. They typically use two different inserts: a central insert near the axis and a peripheral insert at the circumference. The documentation for the specific body specifies the position of the square SPMG 07 insert — central or peripheral — and its grade.
Four — a square has 4 corners. When one cutting edge becomes dull, rotate the insert in its pocket to the next corner without replacing the entire drill. The four cutting edges allow all corners of the insert to be used in sequence.
Grade H6310 is PVD-coated carbide for steels in ISO groups P20-P40 and stainless steel M20-M40. It is a general-purpose grade for steel and stainless steel, but is not suitable for hardened steels above 45 HRC.
Using the formula n = 1000·vc/(π·D), where D is the drill diameter. For steel, select vc from the range 50-75 m/min and feed f from the range 0.15-0.40 mm/rev.
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