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Carbide insert SPKX 07T308 PH 6920 Palbit
0000010780
€8.25 tax inc.
Net price: €6.71
Description
SPKX 07T308 carbide insert – insert for indexable drills
| Technical data | |
|---|---|
| Side length l | 7.94 mm |
| Insert thickness s | 3.97 mm |
| Corner radius rε | 0.80 mm |
| Shape | square (S) |
| Grade | 6920 (Palbit) |
| Application | P20-P45; stainless steel; cast iron |
Insert for indexable drills – operating guidelines
division of work between the center and peripheral inserts, parameter selection, operation without spot drilling
The SPKX 07T308 insert serves as a replaceable cutting insert in indexable drills from the Portuguese company Palbit. In this type of drill, two inserts share the work: the center insert cuts near the axis, where cutting speed drops to nearly zero, while the peripheral insert determines the hole diameter and wall finish. Select parameters based on the nominal drill diameter, not the insert itself. This division of work results from the distribution of cutting speed along the drill radius.
Carbide insert selection and operating guidelines
- Always use a set of two inserts — the center and peripheral positions operate under different conditions; do not interchange their positions in the pockets.
- Parameters based on nominal diameter — cutting speed and feed are selected according to the drill diameter, not the insert size.
- No spot drilling required — the geometry of the two inserts guides the drill automatically, without center punching or a guide bushing.
- The square shape S provides four cutting corners for successive indexing as each cutting edge wears out.
- The dimensions 7.94 × 3.97 mm and radius 0.80 mm must match the pocket in the specific body.
- Indexable drills typically produce holes to tolerance grade H10-H12; greater accuracy may require finishing.
Grade 6920 carbide insert – design and applications
square CVD-coated insert for medium machining and roughing of steel and cast steel
This carbide insert is a square cutting insert made of grade 6920 cemented carbide with a CVD (chemical vapor deposition) coating. The square shape provides four usable corners, with a side length of 7.94 millimeters and a thickness of 3.97 millimeters. Grade 6920 covers steel and cast steel in the ISO range P20-P45, and the product source also confirms stainless steel and cast iron. The insert is seated in its designated body pocket and replaced when the corners are worn out.
Key features of this insert
- Four cutting corners — the square insert allows the cutting edge to be indexed three times before the insert needs to be replaced.
- CVD-coated grade 6920 — for steel and cast steel P20-P45, as well as stainless steel and cast iron confirmed by the source.
- High-temperature resistance — the CVD coating withstands heat in the cutting zone under demanding drilling conditions.
- Corner radius rε 0.80 mm strengthens the cutting edge during medium machining and roughing.
- The insert thickness 3.97 mm ensures cutting edge rigidity under the axial load of the drill.
- The replaceable insert allows the working edge to be renewed without replacing the entire drill body.
Parameter selection and typical applications
Indexable drills equipped with these inserts are suitable for drilling on CNC machine tools with stable guidance. Do not determine rotational speed or feed for grade 6920 without manufacturer data. A square has four corners, so after the first is used, three further positions remain: 4 − 1 = 3 indexing rotations of the insert in its pocket.
CVD-coated grade 6920 is intended for steel and cast steel P20-P45, and the data sheet also confirms stainless steel and cast iron. The indexable drill is self-guiding thanks to the geometry of its two inserts and requires no spot drilling. Always use the insert set recommended by the body manufacturer, because the center and peripheral positions operate under different conditions. The inserts are supplied by the Portuguese manufacturer Palbit, which specializes in cemented carbide tools.
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Application limitation
Grade 6920 CVD use exclusively in the position designated as peripheral. For the center position, select a tougher PVD grade specified by the body manufacturer, because cutting speed drops to nearly zero at the axis.
Square insert designation decoder according to ISO 1832
how to read the SPKX 07T308 code — positions 1–7 of the designation
Designation SPKX 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 3Ktolerance 4Xtype – 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
3KTolerance
Class K (precision)
ground thickness ±0.025 mm
4XType
Manufacturer-specific special type
features outside the ISO 1832 code
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: SPKX 07T308 = 90° square · positive 11° · class K · special type · IC 7.94 mm (l 7.94 mm) · s 3.97 mm · rε 0.8 mm
SPKX 07T308 insert compatibility
what the replaceable indexable drill insert works with and what it does not replace
| Rating | Replaceable insert applications |
|---|---|
| ✔ | Replaceable insert for Palbit indexable drills using square inserts SPKX |
| ✔ | Operation in two positions: center and peripheral, with a grade selected for each position |
| ✔ | Four cutting corners — index when the cutting edge wears out |
| ✔ | Medium machining and roughing of steel and cast steel (ISO P20-P45) |
| ✗ | Grade 6920 CVD in the center position — use a tougher PVD grade |
| ✗ | A different SPKX size without confirmed compatibility with the body pocket |
| ✗ | Typical hole tolerance grade H10-H12 — greater accuracy may require finishing |
Frequently asked questions about the replaceable drill insert
tools, materials, and operation of the replaceable indexable drill insert
It is a replaceable insert for indexable drills from Palbit. The insert is square, with a side length of 7.94 mm, a thickness of 3.97 mm and a corner radius of 0.80 mm. In the drill, it works as a set with a second insert — one occupies the center position and the other the peripheral position.
Grade 6920 with a CVD coating covers steel and cast steel in the range ISO P20-P45. The product source also confirms stainless steel and cast iron. Use this grade only as a peripheral insert.
Four — the square shape provides 4 corners cutting corners. When one becomes dull, index the insert in its pocket to the next one, without replacing the entire drill. This allows the insert to be indexed three times before replacement.
No — despite having the same shape, they operate under different conditions. The center insert cuts near the axis, where the speed drops to nearly 0 m/min, while the peripheral insert determines the hole diameter. Use grade 6920 CVD only in the peripheral position; select a tougher PVD grade for the center.
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Shipping
All orders are delivered by courier company GLS. For orders exceeding 369 PLN gross shipping is FREE
| Courier GLS | Przelew24 / Prepayment | 14,76 zł gross | Delivery time 1 working day |
| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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