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Description
SPKN 1203 milling insert – square insert for 75° face milling
| Technical data | |
|---|---|
| Side length l | 12.70 mm |
| Inscribed circle diameter IC | 12.70 mm |
| Insert thickness s | 3.18 mm |
| Entering angle κ | 75° |
| Clearance angle | 11° (positive) |
| Insert version | right-hand (R) |
| Grade | MTC (PVD) |
| ANSI code | SPKN 42 |
SPKN indexable insert for steel and stainless steel — cutting data
face milling with a 75° milling head, MTC grade — finishing and semi-finishing (ISO P and M groups)
| Material | vc [m/min] | fz [mm/tooth] | ap [mm] |
|---|---|---|---|
| PSteel | 150-220 | 0.10-0.22 | 0.5-3.0 |
| MStainless steel | 80-140 | 0.08-0.18 | 0.3-2.0 |
MTC grade square carbide insert – design and applications
single-sided, positive insert without a hole, with a ground wiper edge
The SPKN 1203 milling insert is a square, single-sided indexable insert made of MTC grade cemented carbide, designed for face milling steel and stainless steel. Positive geometry with a clearance angle of eleven ° reduces cutting resistance, while the absence of a hole and chip breaker allows the insert to be secured with a wedge or top clamp. A ground wiper edge runs along each of the four corners, smoothing the floor surface after the milling head passes. An entering angle of seventy-five ° (suffix E) makes this insert suitable for face mills, where it softens edge entry into the material. Dimensions according to the GOST table: side length 12.70 mm, insert thickness 3.18 mm.
Key advantages of the square milling insert
- Four cutting edges — the square, single-sided insert provides 4 corners; when an edge becomes dull, rotate the insert in its pocket without replacing the entire milling head.
- MTC grade for ISO P and M groups — PVD-coated carbide for steel (P15-P25) and stainless steel (M15-M20), designed for finishing.
- Ground wiper edge — the land at the corner reduces floor surface roughness without an additional wiper insert in the milling head.
- Positive 11° geometry reduces cutting resistance and power consumption when face milling larger surfaces.
- Design without a hole — secured with a wedge or top clamp, without a screw passing through the insert.
- The 75° entering angle thins the chip and softens edge entry into the material during face milling.
Square insert applications and cutting data selection
The SPKN indexable insert performs well when face milling flat surfaces on housings, plates, and castings made of structural steels, as well as stainless steel components. It operates in 75° face mills on conventional and CNC machine tools. Calculate the milling head speed using n = 1000·vc/(π·D): for a milling head with a diameter of 63 mm at a cutting speed of 180 m/min, the result is approximately 910 rpm. Confirm the wiper edge width in the Horn data sheet and calculate the feed per revolution limit as 60% of this value. With five inserts and an example fz = 0.10 mm, the table feed is vf = 0.10·5·910, or approximately 455 mm/min.
MTC grade is recommended for finishing and semi-finishing, so keep the depth of cut at the lower end of the range. For stainless steel, maintain a conservative cutting speed range of 80–140 m/min and a constant feed to prevent work hardening of the layer being cut. Climb milling, in which the edge enters at the thicker part of the chip, extends edge life and improves surface finish on CNC machines with table backlash eliminated.
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Application limitation
Grade MTC is optimized for finishing and semi-finishing — do not use it for heavy roughing with depths of cut of several millimeters per pass. For removing large machining allowances, select a grade with higher edge strength.
Square insert designation decoder according to ISO 1832
how to read the SPKN 1203 EDSR code — positions 1–10 of the designation
Designation SPKN 1203 EDSR according to the standard ISO 1832: 4 letters describe the geometry and construction, 2 numeric codes describe the dimensions, and the suffix EDSR — 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′ 9Sedge 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
EDSR suffix · wiper edge
7EEntering angle
κ = 75°
75° face milling heads
8DWiper land
α′ = 15°
wiper land clearance angle
9SEdge condition
Chamfered and rounded
S-land — strongest edge
10RHand
Right-hand
standard clockwise spindle rotation
✓ 4 corners × 1 side = 4 cutting edges
Full designation: SPKN 1203 EDSR = 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 and rounded edge · right-hand (R)
Milling heads compatible with the SPKN insert
75° face mill pockets — secured with a wedge or top clamp
Selecting a milling head for the SPKN insert
| Compatibility | Milling head or clamping type |
|---|---|
| ✓ | 75° face mills with SPKN pockets (e.g., FWT 75°, Darmet FB75SP15) — entering angle matches suffix E. |
| ✓ | Secured with a wedge or top clamp — the insert has no hole and is held in the pocket by clamping pressure. |
| ✗ | 90° shoulder milling heads — designed for TPKN or APKT inserts, not SPKN. |
| ✗ | 45° face mills — require SEKN/SEKR inserts with a different corner angle. |
| ✗ | NFZ4/NFZ6 milling heads — pockets for SNUN/SNMM inserts, not the SPKN family. |
| ✗ | Screw clamping through a hole — the SPKN insert has no mounting hole. |
Frequently asked questions about the SPKN milling insert
number of edges, milling head selection, suffix meaning, and cutting data
Four — a square has 4 corners, and the positive geometry with a 11° clearance angle makes the insert single-sided, cutting only with its upper face. When a corner becomes dull, rotate the insert in its pocket to the next edge without changing the milling head.
In face mills with an entering angle of 75° (e.g., FWT 75° or Darmet FB75SP15). The insert has no hole, so it is secured in the pocket with a top clamp or wedge. 90° shoulder milling heads and 45° face mills require different inserts.
Four sub-positions: E = entering angle 75°, D = wiper land clearance angle 15°, S = chamfered and rounded edge (S-land (wiper land + edge rounding)), R = right-hand version. These are standardized codes, not proprietary designations.
Yes — MTC grade covers group ISO M15-M20. Maintain a conservative cutting speed range of 80–140 m/min, a constant feed, and continuous emulsion cooling: austenitic steel conducts heat poorly and work-hardens when cutting is too slow.
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