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Description
SPKN 1203 milling insert – square wiper insert
| Technical data | |
|---|---|
| Side length l | 12.70 mm |
| Insert thickness s | 3.18 mm |
| Inscribed circle diameter IC | 12.70 mm |
| Entering angle κ | 75° |
| Chamfer clearance | 15° |
| Version | right-hand (R) |
| Tolerance class | K (ground) |
| Grade | H8320 |
| ANSI code | SPKN 42 |
SPKN indexable insert for face milling steel and cast steel
conservative 45° table for ISO P as a starting point — verify for the 75° milling head
| Material | vc [m/min] | fz [mm/tooth] | ap [mm] |
|---|---|---|---|
| PSteel, cast steel | 150-220 | 0.10-0.22 | 0.5-3.0 |
H8320 cemented carbide insert – design and applications
single-sided 75° square without a hole, with a ground wiper edge
The SPKN 1203 milling insert is a square, single-sided indexable insert made of cemented carbide, designed for face milling steel and cast steel. Its square shape provides four cutting edges, while the positive geometry with an eleven° clearance angle reduces cutting forces and power consumption. The insert has neither a hole nor a chip breaker, so it is secured by a top clamp or wedge in the milling head pocket. The ground wiper edge at the corner, operating at a seventy-five° entering angle, improves the finish of the face-milled surface. Grade H8320 from the Korean brand Horn is a carbide intended for harder materials and more demanding cutting conditions. The dimensions comply with the standard ISO 3365: side length 12.70 mm and thickness 3.18 mm, designated in the ANSI code as SPKN 42.
Key benefits of the SPKN milling insert
- Four cutting edges — the square provides 4 usable corners; once an edge becomes dull, simply index the insert in the milling head pocket.
- Ground wiper edge — the chamfer at the corner smooths the floor of the face-milled surface and allows a higher feed rate without sacrificing surface finish.
- Grade H8320 for more demanding conditions — carbide for harder materials, resistant to abrasive wear and high cutting temperatures.
- Positive geometry with 11° clearance reduces cutting forces and vibration during face milling.
- Clamping with a clamp or wedge, without a hole, simplifies insert replacement in the face mill.
- The 75° entering angle distributes the load over a longer section of the edge than 90° shoulder milling heads.
Applications and milling data selection
The SPKN indexable insert is suitable for face milling on conventional milling machines and CNC machine tools. Calculate the spindle speed using n = 1000·vc/(π·D): for a milling head with a diameter of 63 mm at a cutting speed vc = 180 m/min, the result is approximately 910 rpm. Four ground edges and hard grade H8320 carbide provide resistance to abrasive wear and elevated operating temperatures. The insert is used for roughing and finishing flat surfaces in carbon structural steels, moderately hard alloy steels and cast steel, all within material group ISO P.
The wiper edge reduces machining time but requires careful selection of the feed per tooth (fz). Keep the feed per revolution at no more than sixty percent of the wiper edge width to avoid degrading the surface finish and overloading the corner. Machine steel and cast steel with coolant to stabilize the operating temperature of the wiper edge and reduce its abrasive wear. Select the depth of cut according to the rigidity of the machine–tool–workpiece system to limit vibration of the thin, single-sided insert.
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Application limitation
Insert SPKN has no mounting hole — it fits only pockets with a top clamp or wedge. It cannot be installed in milling heads with a central screw hole (for inserts APKT or SEKT) or in 90° shoulder milling heads.
Square insert designation decoder according to ISO 1832
how to read the SPKN 1203 EDTR code — positions 1–10 of the designation
Designation SPKN 1203 EDTR according to the standard ISO 1832: 4 letters describe the geometry and construction, 2 numeric codes describe the dimensions, and the suffix EDTR — the wiper edge geometry. Each field has a number, an icon and a brief description.
ISO 1832 designation decoder — how to read the code
1Sshape 2Pangle α 3Ktolerance 4Ntype – 512size 603thickness – 7Eangle κ 8Dland α′ 9Tedge 10Rhand
Positions 1–3 · 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
Positions 4–6
4NType
Without hole or chip breaker
clamp or wedge mounting
512Size
l = 12.7 mm
IC = 12.7 mm (square: IC = l)
603Thickness
s = 3.18 mm
between rake faces
EDTR suffix · wiper edge
7EEntering angle
κ = 75°
75° face milling heads
8DWiper land
α′ = 15°
wiper land clearance angle
9TEdge condition
Chamfered (T-land)
the chamfer strengthens the edge during roughing
10RHand
Right-hand
standard clockwise spindle rotation
✓ 4 corners × 1 side = 4 cutting edges
Full designation: SPKN 1203 EDTR = square 90° · positive 11° · class K · without a hole or chip breaker · IC 12.7 mm (l 12.7 mm) · s 3.18 mm · κ 75° · wiper land 15° · chamfered edge · right-hand (R)
SPKN insert compatibility with milling heads
pockets for a square insert without a hole, κ 75°
Milling head and clamping selection
| Rating | Milling head and clamping selection criterion |
|---|---|
| ✔ | Face mills with a 75° entering angle (e.g. FWT 75°, Darmet FB75SP15) |
| ✔ | Top clamp or wedge clamping — insert without a hole or chip breaker |
| ✔ | Face milling steel and cast steel (ISO P group) |
| ✗ | 90° shoulder milling heads — use inserts TPKN or APKT, not SPKN |
| ✗ | 45° face mills — require SEKN/SEAN inserts, not SPKN |
| ✗ | Pockets with a central screw hole — the SPKN insert has no mounting hole |
Frequently asked questions about the SPKN insert
edges, grade H8320, EDTR suffix and milling head selection
Four — a square has 4 corners, and the positive geometry with a 11° clearance angle makes the insert single-sided, using only its top face. When a corner is worn, index the insert in the milling head pocket to the next edge without replacing the holder.
Grade H8320 from the Korean brand Horn is a carbide for harder materials and more demanding cutting conditions: steel and cast steel (group ISO P). It offers resistance to abrasive wear and elevated operating temperatures.
Four subpositions according to ISO 1832: E = corner chamfer entering angle 75°, D = wiper land clearance angle 15°, T = chamfered edge (T-land), R = right-hand version. In the store's designation decoder, this is abbreviated to EDR.
In face mills with an entering angle of 75°, for example FWT 75° or Darmet FB75SP15. The insert has no hole, so it is secured with a top clamp or wedge — it does not fit pockets with a central screw hole.
Product accessories
Milling head AFM75C-SP12-D050-A22-Z04 Akko
Reference: 0000003728 In stock < 10 items
€86.84
€106.82 brutto
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