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Carbide insert WCMX 050308 PH 6920 Palbit - Turning inserts
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  • Carbide insert WCMX 050308 PH 6920 Palbit - Turning inserts
  • Carbide insert WCMX 050308 PH 6920 Palbit - Turning inserts - nr. 1
Artykuły Techniczne

Carbide insert WCMX 050308 PH 6920 Palbit

Artykuły Techniczne Artykuły Techniczne
0000009391
€9.39 tax inc.

Net price: €7.63

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Description

WCMX 050308 carbide insert – insert for indexable drills

Technical data
Side length l5 mm
Insert thickness s3.18 mm
Hole diameter d13.2 mm
Corner radius rε0.80 mm
ShapeW – 80° trigon
Number of edges3
TypeX – drilling type
GradePH 6920 (CVD)

Insert for indexable drills – operating principles in the body

central and peripheral inserts and ISO groups P, M, and K

An indexable drill uses two inserts — peripheral and central — and each position requires a different carbide grade. This division results from the distribution of cutting speed along the radius: speed approaches zero at the axis of rotation and reaches its maximum at the periphery. CVD-coated grades, such as PH 6920, are intended for the peripheral position, which determines hole diameter and quality. For the center, where the insert displaces material at low speed and under high axial forces, the body manufacturer selects a separate, tougher grade. Do not interchange inserts between positions, even if their ISO shapes are identical.

Drilling insert selection and operating guidelines

  • Grade PH 6920 covers ISO groups P (steel), M (stainless steel) and K (cast iron) — without published vc and feed tables.
  • Select cutting data based on the nominal drill diameter, not the individual insert.
  • Use a complete set of inserts — central and peripheral — in the grades recommended by the body manufacturer; do not swap their positions.
  • The peripheral insert determines the hole diameter and surface roughness, while the central insert carries high axial forces.
  • At a depth of 4×D–5×D, internal coolant flushes chips out of the flute and protects the insert against breakage.

Applications of the WCMX 050308 insert and Palbit PH 6920 grade

drilling steel, stainless steel, and cast iron with an indexable drill

The WCMX 050308 carbide insert is an indexable insert for indexable drills in Palbit grade PH 6920. Shape W, a trigon with a 80° corner angle, and type X indicate a special design; confirm the presence and side of the chip breaker in the product data sheet. The insert is mounted in a compatible pocket in the steel drill body, allowing only the cutting edge to be replaced without replacing the entire tool. Grade PH 6920, coated by CVD (chemical vapor deposition), covers steel, stainless steel, and cast iron.

Key advantages of the PH 6920 carbide insert

  • Three indexable edges — the W trigon shape provides 3 corners; after wear, rotate or replace only the insert.
  • Universal grade PH 6920 — one CVD-coated carbide for steel, stainless steel, and cast iron, ISO groups P, M, and K.
  • Heat resistance of 700–1000°C — the CVD coating protects the edge against abrasive wear at high cutting temperatures.
  • The type X design is manufacturer-specific; confirm the clamping method and chip breaker geometry in the product data sheet.
  • The self-centering geometry of the two inserts guides the drill without spot drilling, reducing the operation to a single pass.
  • The 0.8 mm corner radius strengthens the corner during interrupted cutting and when higher feeds are selected.

Hole drilling and parameter selection

The insert is suitable for drilling holes in structural steel, stainless steels, and cast iron on CNC and conventional machine tools. Parameters are selected based on the nominal drill diameter and body specifications. For an example Ø30 mm drill, an overhang range of 4D–5D corresponds to a depth of 4·30 = 120 mm to 5·30 = 150 mm. Refer to the data sheet for the specific body for cutting speed and feed.

Grade PH 6920 offers strength under severe cutting conditions and resistance to abrasive wear at high temperatures. Heat resistance reaching 700–1000°C protects the carbide coating during long passes. Increased edge security supports drilling under unstable conditions, such as interrupted stock. Select the hole depth to match the body length, expressed as a multiple of the diameter (xD).

▲
Application limitation

At a hole depth approaching 4×D–5×D internal coolant through the body channels (IK) is practically mandatory. Without flushing chips out of the flute, torque increases, creating a risk of clogging and insert or body breakage.

Trigon insert designation decoder according to ISO 1832

how to read the WCMX 050308 code — designation positions 1–7

Designation WCMX 050308 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

1Wshape 2Cangle α 3Mtolerance 4Xtype – 505edge length 603thickness 708radius rε

Positions 1–4 · ISO code

1WShape

80° trigon

3 corners of 80° per side

2CClearance angle

α = 7°

positive, single-sided

3MTolerance

Class M (intermediate)

IC ±0.05–0.15 · thickness ±0.13 mm

4XType

Manufacturer-specific special type

features outside the ISO 1832 code

Positions 5–7 · dimensions [mm]

505Edge length

l = 5 mm

code 05 → edge length

603Thickness

s = 3.18 mm

between rake faces

708Corner radius

rε = 0.8 mm

code ÷ 10 → radius in mm

✓ 3 corners × 1 side = 3 cutting edges

Full designation: WCMX 050308 = 80° trigon · positive 7° · class M · special type · l 5 mm · s 3.18 mm · rε 0.8 mm

WCMX 050308 insert compatibility

materials and tools compatible with the drilling insert

RatingApplication
✓Drilling structural steel — ISO group P
✓Drilling stainless steel — ISO group M
✓Drilling cast iron — ISO group K
✓Indexable drills with a pocket for shape W (type X)
✓CNC and conventional machine tools
✗Turning and boring — this is a drilling insert, not a turning insert
✗Operation without the central + peripheral insert set recommended for the body

Frequently asked questions about the drilling insert

applications, grade PH 6920, and operation in an indexable drill

For indexable drills whose steel body has two pockets for replaceable inserts — central and peripheral. The insert is mounted in a compatible pocket, so after wear you replace only the cutting edge without replacing the body. The code WCMX describes shape W (80° trigon) and drilling type X.

Grade PH 6920 from Palbit is a CVD-coated carbide suitable for universal use in steel (ISO P), stainless steel (ISO M) and cast iron (ISO K). It retains abrasive wear resistance at cutting temperatures reaching 700–1000°C.

The central insert operates at a cutting speed from zero to approximately 50% vc max and displaces material at the drill axis. The peripheral insert operates from 50% to 100% vc max and determines hole diameter and surface quality. CVD grades, such as PH 6920, are used in the peripheral position; a separate, tougher grade is selected for the center.

No — the self-centering geometry of the two inserts guides the drill without spot drilling, despite the long overhang. At a depth of 4×D–5×D however, use internal coolant to flush chips out of the flute and prevent insert breakage.

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Carbide insert WCMX 050308 PH 6920 Palbit

Carbide insert WCMX 050308 PH 6920 Palbit

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