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Description
Carbide insert WCMX 040208 – cutting edge for an indexable drill
| Technical data | |
|---|---|
| ISO code | WCMX 040208 |
| Shape | trigon 80° (W) |
| Number of edges | 3 |
| Carbide grade | H6310 (PVD) |
| Side length l | 4 mm |
| Insert thickness s | 2.38 mm |
| Hole diameter d1 | 3.1 mm |
| Corner radius rε | 0.80 mm |
| Clearance angle | 7° (C) |
| Tolerance class | M |
Drilling parameters for the H6310 indexable insert – steel and stainless steel
ISO groups P and M — selecting cutting speed Vc and feed f for an indexable drill
| Material | Vc [m/min] | Feed f [mm/rev] |
|---|---|---|
| PSteel | 50-75 | 0.15-0.40 |
| MStainless steel | 35-50 | 0.10-0.22 |
Grade H6310 insert for indexable drills – design and applications
type X 80° trigon as a replaceable center or peripheral cutting edge
Carbide insert WCMX 040208 is an indexable drilling insert made of cemented carbide in grade H6310, designed for indexable drills. The trigon shape with an eighty° angle (letter W according to ISO) and type X design give it geometry suited to operation in a drill body. The insert is seated in a compatible body pocket and serves as a replaceable cutting edge — center or peripheral. The PVD coating, or physical vapor deposition, reduces friction and protects the edge from high temperatures during drilling. The insert dimensions are side length l 4 mm, thickness 2.38 mm and corner radius rε 0.80 mm.
Key benefits of the cemented carbide drilling insert
- Three indexable edges — the W trigon shape provides 3 corners; when dull, the insert is indexed in the body pocket.
- Grade H6310 with PVD coating — for steel P20-P40 and stainless steel M20-M40
- Type X drilling geometry — 80° trigon shape suited to operation in an indexable drill body.
- The d1 hole of 3.1 mm allows you to check insert compatibility with the pocket of a specific drill body.
- The corner radius rε 0.80 mm strengthens the edge and promotes smooth chip evacuation.
- The PVD coating reduces friction and protects the edge from high temperatures during drilling.
Applications and selection of drilling parameters
The insert is suitable for indexable drills used to drill holes in structural steel and stainless steel. Calculate the drill speed using n = 1000·Vc/(π·D). For an indexable drill with a diameter of 16 mm at a cutting speed of Vc = 60 m/min the result is approximately 1194 rpm. Feed is selected in millimeters per revolution (f). For steel, maintain a range of 0.15 to 0.40 mm/rev, and for stainless steel, 0.10 to 0.22 mm/rev. A lower feed in stainless materials limits work hardening of the layer being cut.
Indexable drills guide themselves with two cooperating inserts, so no spot drilling is required. The peripheral insert determines the hole diameter and quality, while the central insert works near the drill axis, where cutting speed drops almost to zero. For this reason, both positions require the insert combination recommended for the specific body, and the inserts must not be interchanged arbitrarily. Indexable drills are typically used for holes with diameters greater than a dozen or so millimeters and depths of up to approximately four diameters. Supply coolant through the drill's internal channels to remove chips from the cutting zone.
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Application limitation
Grade H6310 is not intended for hardened steels above 45 HRC. For harder and more difficult-to-machine materials, select grade H8320 from the Korean brand Horn.
Trigon insert designation decoder according to ISO 1832
how to read the WCMT 040208 code — positions 1–7 of the designation
Designation WCMT 040208 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 4Ttype – 504edge length 602thickness 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
4TType
Countersunk hole + chip breaker
countersink 40–60°, single-sided chip breaker
Positions 5–7 · dimensions [mm]
504Edge length
l = 4 mm
code 04 → edge length
602Thickness
s = 2.38 mm
between rake faces
708Corner radius
rε = 0.8 mm
code ÷ 10 → radius in mm
✓ 3 corners × 1 side = 3 cutting edges
Full designation: WCMT 040208 = trigon 80° · positive 7° · class M · countersunk hole and chip breaker · l 4 mm · s 2.38 mm · rε 0.8 mm
Drilling insert material compatibility
ISO groups machined with grade H6310 and insert selection for the drill body
| Material group | ISO range | Application |
|---|---|---|
| Structural and low-alloy steel | P20-P40 | ✔ recommended |
| Austenitic stainless steel | M20-M40 | ✔ recommended |
| Hardened steel above 45 HRC | H | ✗ not recommended |
The insert fits indexable drill bodies designed for a pocket of this size. The central and peripheral inserts are selected separately according to the data sheet for the specific body.
Frequently asked questions about the drilling insert
applications, materials, and insert selection for an indexable drill
This is a replaceable drilling insert for indexable drills. It has a trigon shape with an angle of 80° (letter W) and type X with drilling geometry. The insert is mounted in a compatible body pocket as a central or peripheral cutting edge.
Grade H6310 is a PVD-coated carbide for steel P20-P40 and stainless steel M20-M40 It is not used for hardened steels above 45 HRC.
The peripheral insert operates at a speed ranging from approximately 50% to 100% of the maximum Vc value and determines the hole diameter and quality. The central insert works close to the axis, where speed drops almost to zero. Both are selected as the combination recommended for the body.
Use the formula n = 1000·Vc/(π·D). For a drill Ø16 mm and the specified speed Vc = 60 m/min the result is approximately 1194 rpm. Select the feed separately from the range appropriate for the material being machined.
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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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