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Description
TPKN 2204 milling insert – 90° triangle without a hole
| Technical data | |
|---|---|
| Side length l | 22.0 mm |
| Inscribed circle diameter IC | 12.7 mm |
| Insert thickness s | 4.76 mm |
| Shape | triangle, 3 edges |
| Entering angle κ | 90° |
| Grade | HTC (Horn), carbide |
| ANSI code | TPK 43 |
TPKN insert for steel and stainless steel – milling data
shoulder and face milling with 90° milling heads — ISO P and M groups
| Material | Vc [m/min] | Feed fz [mm/tooth] | ap [mm] | ae [% D] |
|---|---|---|---|---|
| PSteel | 130-200 | 0.10-0.20 | 1.0-4.0 | 30-70 |
| MStainless steel | 70-130 | 0.06-0.15 | 0.5-2.0 | 25-60 |
Insert without a hole for 90° milling heads – design and applications
single-sided triangle with a wiper edge, PPR suffix
The TPKN 2204 milling insert is a single-sided, triangular indexable insert without a hole or chip breaker, designed for milling steel and stainless steel. Its three cutting edges include the corners of the triangle, and its positive geometry with an eleven° clearance angle reduces cutting resistance. The suffix PPR indicates a ninety° entering angle and a ground wiper land at the corner, so the insert is used in 90° shoulder milling heads and indexable milling cutters. It is secured by a top clamp, without a central screw (clamp-on). The grade HTC from the Korean brand Horn is a carbide for ISO P and M groups — covering structural steel and stainless steel.
Key features of the TPKN 2204 PPR milling insert
- Three cutting edges — the single-sided triangle provides 3 corners; once an edge is dull, rotate the insert in its pocket without replacing the milling head.
- Entering angle 90° — suffix P in the first position; the milling head produces a wall perpendicular to the floor during face and shoulder milling.
- Wiper edge at the corner — the ground land improves the floor finish and allows a higher feed per revolution.
- Design without a hole or chip breaker, secured by a top clamp in the milling head's clamp-on pocket.
- HTC cemented carbide grade for ISO P and M groups — structural steel and stainless steel.
- Dimensions for size 2204: side length 22.0 mm, IC 12.7 mm, thickness 4.76 mm, ANSI code TPK 43.
Applications and milling data selection
The TPKN 2204 PPR insert is suitable for face milling, shoulder milling and machining square corners, where the 90° entering angle produces a wall perpendicular to the floor. Calculate the milling head speed using n = vc·1000/(π·D): for a head diameter of 80 mm at a cutting speed of 150 m/min, the result is approximately 597 rpm. Calculate the table feed rate using vf = fz·z·n — with six inserts and a feed per tooth (fz) of 0.15 mm, this gives approximately 537 mm/min. The wiper edge improves the floor finish at higher feeds.
The absence of a hole and the single-sided, positive design simplify replacement: once a corner is dull, rotate the insert in its pocket to the next of its three edges. The ground land supports finishing, but keep the feed per revolution below sixty percent of this edge's width to avoid degrading the surface finish. For stainless steel, maintain a constant feed and continuous coolant supply, as austenitic steel work-hardens and conducts heat poorly. Select the depth of cut to suit spindle power and workpiece clamping rigidity. The geometry allows high-productivity machining at increased speeds, reducing cutting time and improving machine utilization.
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Application limitation
Insert TPKN has no hole — it fits only milling heads with a 90° clamp-on pocket, not pockets designed for inserts with a hole (APKT, SEKT). HTC grade is not intended for hardened steels.
Triangular insert designation decoder according to ISO 1832
how to read the TPKN 2204 PPR code — designation positions 1–9
Designation TPKN 2204 PPR according to the standard ISO 1832: 4 letters describe the geometry and construction, 2 numeric codes describe the dimensions, and the suffix PPR — the wiper edge geometry. Each field has a number, an icon and a brief description.
ISO 1832 designation decoder — how to read the code
1Tshape 2Pangle α 3Ktolerance 4Ntype – 522size 604thickness – 7Pangle κ 8Pland α′ 9Rhand
Positions 1–3 · ISO code
1TShape
60° triangle
3 corners of 60° 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
522Size
l = 22 mm
IC = 12.7 mm · 1/2″
604Thickness
s = 4.76 mm
between rake faces
PPR suffix · wiper edge
7PEntering angle
κ = 90°
90° angle milling cutters and milling heads
8PWiper land
α′ = 11°
wiper land clearance angle
9RHand
Right-hand
standard clockwise spindle rotation
✓ 3 corners × 1 side = 3 cutting edges
Full designation: TPKN 2204 PPR = triangle 60° · positive 11° · class K · without hole or chip breaker · IC 12.7 mm (l 22 mm) · s 4.76 mm · κ 90° · wiper land 11° · right-hand (R)
Compatible milling heads and indexable milling cutters
90° clamp-on pockets for triangular TPKN inserts without a hole
Compatible / incompatible:
| Status | Milling heads, cutters and applications |
|---|---|
| ✔ | Shoulder milling heads and indexable milling cutters 90° with a clamp-on pocket for a TPKN insert without a hole |
| ✔ | Milling heads of type Dolfamex 220.17 (Ø40–200 mm) and Darmet FA90TP22 |
| ✔ | Face milling, shoulder milling and machining square corners in steel and stainless steel |
| ✗ | Face milling heads 75° — pocket for square inserts SPKN, not triangular inserts |
| ✗ | Pockets designed for inserts with a hole (APKT, SEKT) |
| ✗ | Other milling heads without a confirmed clamp-on pocket for TPKN 2204 dimensions |
Frequently asked questions about the TPKN 2204 insert
PPR suffix, milling head selection and milling parameters
Three — the triangle has 3 corners, and the positive geometry with a clearance angle of 11° makes the insert single-sided, with only its top side used for cutting. Once a corner is dull, rotate the insert in the milling head pocket to the next edge without removing it.
These are standardized subpositions: the first P = entering angle 90°, the second P = wiper land clearance angle 11°, a R = right-hand version. This is why the insert is used in 90° shoulder milling heads.
Milling heads and indexable milling cutters 90° with a clamp-on pocket without a hole, e.g. Dolfamex 220.17 (Ø40–200 mm) and Darmet FA90TP22. It does not fit pockets designed for inserts with a hole, such as APKT and SEKT.
Yes — HTC grade covers the group ISO M. Maintain a cutting speed of 70–130 m/min, constant feed 0.06–0.15 mm/tooth and continuous coolant supply: austenitic steel work-hardens when cutting too slowly.
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