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Carbide insert SEKN 1203 AFTN H6310 Horn
€6.15 tax inc.
Net price: €5.00
Description
SEKN 1203 milling insert – face milling steel and stainless steel
| Technical data | |
|---|---|
| Side length l | 12 mm |
| Insert thickness s | 3.2 mm |
| Number of edges | 4 |
| Entering angle κ | 45° |
| Mounting | top clamping (no hole) |
| Grade | H6310 (PVD-coated carbide) |
| ANSI code | SEKN 42AFTN |
SEKN 1203 indexable insert – 45° face milling parameters
face milling and facing — ISO groups P and M covered by grade H6310
| Material | Vc [m/min] | Feed fz [mm/tooth] | ap [mm] | ae [% D] |
|---|---|---|---|---|
| PSteel | 150-220 | 0.10-0.22 | 0.5-3.0 | 60-80 |
| MStainless steel | 80-140 | 0.08-0.18 | 0.3-2.0 | 50-70 |
H6310 carbide insert for 45° face mills – design and operation
square without a hole, secured by a top clamp, with a wiper flat
The SEKN 1203 milling insert is a square, single-sided indexable insert made of grade H6310 cemented carbide, designed for face milling steel and stainless steel. The square shape provides four cutting edges, while AFTN is a manufacturer code and does not independently confirm the milling head's entering angle. This geometry directs cutting forces primarily axially, toward the spindle, making operation smoother and less prone to vibration than with 90° milling heads. The insert has no hole — it is secured by a top clamp in the face mill pocket. The wiper flat near the corner reduces machined surface roughness. The PVD (physical vapor deposition) coating on the carbide substrate increases cutting edge wear resistance in interrupted cutting.
Key advantages of the H6310 cemented carbide insert
- Four cutting edges — the square provides 4 corners per side; when an edge becomes dull, rotate the insert in its pocket without replacing the entire milling head.
- Grade H6310 for ISO groups P and M — PVD-coated carbide for steel (P20-P40) and stainless steel (M20-M40), excluding hardened steels.
- 45° entering angle — primarily axial forces, less vibration, and a thinner chip allow a higher feed per tooth during face milling.
- The wiper flat near the corner improves surface smoothness and reduces visible feed marks on the face-milled workpiece.
- Top clamping without a hole simplifies insert replacement and increases seating rigidity in the pocket.
- Dimensions according to the designation: side length 12 mm, thickness 3.2 mm — fit face mill pockets for size SEKN 1203.
Applications and face milling data selection
The SEKN 1203 insert is suitable for face milling flat surfaces, facing castings, and preparing mounting reference surfaces in structural steels and stainless steels. Calculate milling head speed using n = 1000·vc/(π·D): for a milling head with a diameter of 63 mm at vc = 180 m/min, the result is approximately 910 rpm. Calculate the feed rate using vf = fz·z·n — with a feed per tooth fz of 0.15 mm and five inserts, this gives approximately 683 mm/min. Grade H6310 indexable inserts are supplied by the Korean brand Horn.
For stainless steel, maintain a cutting speed of 80–140 m/min and a constant feed to limit work hardening of the layer being cut and improve heat removal through the chip. A forty-five-degree entering angle reduces chip thickness to approximately 0.7 of the feed per tooth, distributing the load over a longer section of the edge and increasing cutting edge life when face milling wide surfaces. Select the depth of cut within the recommended face milling range and use climb milling so the cutting edge enters at the thicker part of the chip.
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Application limitation
Grade H6310 is not intended for hardened steels above 45 HRC. For hardened materials, select an insert SEKN 1203 in a grade intended for machining harder materials.
Square insert designation decoder according to ISO 1832
how to read the SEKN 1203 AFTN code — positions 1–10 of the designation
Designation SEKN 1203 AFTN according to the standard ISO 1832: 4 letters describe the geometry and construction, 2 numeric codes describe the dimensions, and the suffix AFTN — 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 2Eangle α 3Ktolerance 4Ntype – 512size 603thickness – 7Aangle κ 8Fland α′ 9Tedge 10Nhand
Positions 1–3 · ISO code
1SShape
Square 90°
4 corners of 90° per side
2EClearance angle
α = 20°
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 mm
IC = 12 mm (square: IC = l)
603Thickness
s = 3.18 mm
between rake faces
AFTN suffix · wiper edge
7AEntering angle
κ = 45°
45° angle milling cutters and milling heads
8FWiper land
α′ = 25°
wiper land clearance angle
9TEdge condition
Chamfered (T-land)
the chamfer strengthens the edge during roughing
10NHand
Right-hand and left-hand
symmetrical design
✓ 4 corners × 1 side = 4 cutting edges
Full designation: SEKN 1203 AFTN = 90° square · 20° positive · class K · without hole or chip breaker · IC 12 mm (l 12 mm) · s 3.18 mm · κ 45° · 25° wiper chamfer · chamfered edge · right-hand and left-hand (N)
SEKN 1203 insert material compatibility
where the H6310 face milling insert is suitable and where it should not be used
SEKN 1203 insert application range
| ✔ | Structural and alloy steel — group ISO P20-P40 |
| ✔ | Austenitic and ferritic stainless steel — group ISO M20-M40 |
| ✔ | Face milling flat surfaces and facing with milling heads with an entering angle of 45° |
| ✗ | Hardened steel above 45 HRC — outside the range of grade H6310 |
| ✗ | Selecting the milling head angle solely from the AFTN code — compatibility requires the tool data sheet |
| ✗ | Turning — insert for face milling only |
Frequently asked questions about the SEKN 1203 insert
clamping, grade H6310, and face milling parameters
Four. The square insert has 4 corners, and its single-sided geometry means only the top side is used. When an edge becomes dull, rotate the insert in its pocket by 90° to the next cutting edge without replacing the entire face mill.
Compatibility with a milling head with an entering angle of 45° must be confirmed in the tool data sheet; the code alone AFTN does not determine the angle. The insert has no hole, so it is secured by a top clamp in a milling head pocket for size SEKN 1203 (side 12 mm, thickness 3.2 mm).
Yes — grade H6310 covers group ISO M20-M40. Maintain a cutting speed of 80–140 m/min, feed 0.08–0.18 mm/tooth and continuous coolant supply: austenitic steel work-hardens when cutting too slowly.
The SEKN 1203 insert is type N — without a hole or chip breaker. It is secured with a top clamp or wedge in the face mill pocket. Tolerance class K ensures repeatable cutting edge positioning after indexing the insert.
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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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