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Carbide insert SPKX 140512 PH 6920 Palbit
731108
€9.71 tax inc.
Net price: €7.89
Description
SPKX 140512 carbide insert – for Palbit indexable drills
| Technical data | |
|---|---|
| Shape | 90° square (type S) |
| Side length l | 14.30 mm |
| Insert thickness s | 5.56 mm |
| Hole diameter d1 | 5.75 mm |
| Corner radius rε | 1.2 mm |
| Carbide grade | 6920 |
| Manufacturer | Palbit |
| Application | indexable drills |
SPKX 140512 indexable insert in an indexable drill – operating principles
cutting edge roles, self-centering, and drilling parameter selection
An indexable drill consists of a steel body with pockets in which replaceable carbide inserts are secured with screws. It typically uses two inserts: a central insert at the axis and a peripheral insert at the outer diameter. This arrangement eliminates sharpening — when an edge wears, simply rotate or replace the insert. The insert SPKX 140512 serves as one of the cutting edges in this arrangement.
- Cutting edge roles: the central insert works at the axis, and the peripheral insert at the outer edge of the hole diameter.
- Self-centering: the geometry of the two inserts guides the drill without spot drilling.
- Parameter selection: speed and feed are set based on the nominal drill diameter.
- Insert set: the central and peripheral inserts are selected and purchased separately to match the body.
6920 cemented carbide insert – advantages and applications
square insert for indexable drills in grade 6920
The SPKX 140512 carbide insert is a square indexable insert from the Portuguese company Palbit, designed for indexable drills. The square shape provides four cutting edges on one side, and each edge is a separate, indexable cutting edge. The cemented carbide grade 6920 combines high hardness with abrasive wear resistance and a strong core. This enables the insert to machine hard materials, even at high spindle speeds. Higher cutting speed translates directly into greater drilling productivity.
Key advantages of the SPKX 140512 indexable insert
- Four edges per insert — the square shape provides 4 indexable edges; after wear, rotate the insert to the next cutting edge without replacing the body.
- Carbide grade 6920 — high hardness and abrasive wear resistance with a strong core, for machining hard materials.
- Operation at high rotational speeds — cemented carbide maintains its edge at high cutting speeds, increasing drilling productivity.
- The replaceable insert eliminates sharpening — reconditioning the tool requires rotating or replacing the cutting insert in the body pocket.
- Suitable for conventional machine tools and computer-controlled CNC machines.
- Designed for semi-finishing and roughing holes, including under difficult cutting conditions.
Applications and selection of drilling parameters
The SPKX 140512 insert for indexable drills is suitable for semi-finishing and roughing holes, including under difficult cutting conditions. Cutting speed vc increases linearly with radius according to the formula vc = π·D·n/1000. For a drill with a diameter of 25 mm rotating, for example, at 1500 rpm, the peripheral edge reaches vc ≈ π·25·1500/1000 ≈ 118 m/min, while speed drops to zero at the axis itself. This difference explains the division of work between the central and peripheral inserts.
The peripheral insert determines hole diameter and surface finish, while the central insert carries high axial forces at nearly zero speed at the axis. The self-centering geometry of the two inserts guides the drill without spot drilling, shortening the operation. Cutting data is selected based on the nominal body diameter, not the individual insert. Always use the insert set recommended by the drill manufacturer — the central and peripheral inserts are purchased separately. Do not interchange inserts between positions, even if their shapes are identical, because they differ in grade and chip breaker geometry.
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Application limitation
Insert SPKX 140512 is designed for semi-finishing and roughing — for finishing holes with high dimensional accuracy, select an insert and geometry dedicated to precision machining. Always use the central and peripheral insert set specified for the particular drill body.
Square insert designation decoder according to ISO 1832
how to read the SPKX 140512 code — designation positions 1–7
Designation SPKX 140512 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 – 514size 605thickness 712radius 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]
514Size
l = 14.3 mm
IC = 14.3 mm (square: IC = l)
605Thickness
s = 5.56 mm
between rake faces
712Corner radius
rε = 1.2 mm
code ÷ 10 → radius in mm
✓ 4 corners × 1 side = 4 cutting edges
Full designation: SPKX 140512 = 90° square · positive 11° · class K · special type · IC 14.3 mm (l 14.3 mm) · s 5.56 mm · rε 1.2 mm
SPKX 140512 insert compatibility and applications
materials and operating conditions — suitable and unsuitable applications
What the SPKX 140512 insert is suitable for:
| ✓ | Semi-finishing and roughing holes |
| ✓ | Indexable drills with a pocket for a square insert |
| ✓ | Hard materials at high spindle speeds |
| ✓ | Conventional machine tools and CNC machines |
| ✗ | Finishing with high dimensional accuracy |
| ✗ | Operation without a complete central and peripheral insert set |
Frequently asked questions about the SPKX 140512 insert
edges, drill selection, grade, and operation without spot drilling
The square shape provides 4 cutting edges on one side of the insert. When one edge wears, rotate the insert in the pocket to the next cutting edge without replacing the entire drill. This reduces the machining cost per hole.
Indexable drills with a pocket for a square insert with the following dimensions: side length l 14.30 mm, thickness s 5.56 mm, hole d1 5.75 mm. The central and peripheral inserts are selected according to the data sheet for the specific body and purchased separately.
Grade 6920 is a cemented carbide with high hardness and enhanced abrasive wear resistance while retaining a strong core. This enables the insert to machine hard materials and withstand high rotational speeds during semi-finishing and roughing.
No. The self-centering geometry of 2 the inserts — central and peripheral — guides the drill through the material without spot drilling. The hole is produced in a single operation, despite the tool's long overhang relative to its diameter.
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| 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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