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Description
Carbide insert SPNT 060304 – square insert for indexable drills
| Technical data | |
|---|---|
| Side length l | 6.35 mm |
| Insert thickness s | 3.18 mm |
| Corner radius rε | 0.40 mm |
| ANSI code | SPNT 221 |
| Shape | square (S) |
| Design | positive, indexable |
| Number of edges | 4 |
| Carbide grade | WPM |
| Brand | Walter |
| Application | indexable drills |
Cutting data for the SPNT 060304 indexable drill insert
ISO groups P, M, K and N — steel, stainless steel, cast iron and nonferrous metals
| Material | Vc [m/min] | Feed f [mm/rev] |
|---|---|---|
| PSteel | 50-75 | 0.15-0.40 |
| MStainless steel | 35-50 | 0.10-0.22 |
| KCast iron | 50-70 | 0.25-0.45 |
| NAluminum and nonferrous metals | 80-100 | 0.25-0.40 |
Carbide insert SPNT 060304 – design and selection for drilling
square Walter insert in grade WPM for indexable drill bodies
The SPNT 060304 carbide insert is a square, positive indexable insert from the German manufacturer Walter, designed for drills with replaceable inserts. In such a drill, the steel body has two pockets: one for the center insert near the axis and another for the peripheral insert at the outer edge. The indexable drill insert serves as a replaceable cutting edge secured to the drill body with a screw. The square profile provides four cutting edges, and the corner radius rε 0.40 mm forms the transition from the hole bottom to the wall. The WPM carbide grade withstands high cutting zone temperatures, allowing the drill to operate at higher speeds and greater productivity.
Key benefits of the WPM carbide indexable insert
- Four cutting edges — the square insert provides 4 corners; when dull, index it in the body pocket without replacing the entire drill.
- Grade WPM for ISO groups P, M, K and N — one grade covers steel, stainless steel, cast iron, aluminum and nonferrous metals.
- Heat resistance up to 700–1000°C — WPM carbide retains its hardness at elevated cutting speeds and high productivity.
- Positive geometry reduces cutting forces and power consumption as the drill enters the material.
- The 0.40 mm corner radius forms a smooth transition from the hole bottom to the wall and improves surface finish.
- Screw clamping through the center hole allows quick insert replacement without removing the drill from the spindle.
Applications and selection of drilling parameters
The SPNT 060304 indexable insert (also written as spnt060304) is used in indexable drills for producing holes in unalloyed and alloy steel, cast iron and nonferrous metals. Calculate the spindle speed using n = 1000·Vc/(π·D), where D is the drill diameter. For a body diameter of 20 mm at a cutting speed of Vc = 60 m/min, the result is approximately 955 rpm. Cast iron and aluminum can be drilled faster than stainless steel, which dissipates heat less effectively. Read the feed from the cutting data table, keeping in mind that the two inserts are loaded differently along the drill radius.
The peripheral insert determines the hole diameter, tolerance and wall finish because it operates at full cutting speed at the drill periphery. The center insert, located near the axis of rotation, cuts at near-zero speed, so the material is deformed rather than cut there. For this reason, both positions are selected as a cooperating pair according to the specific body data sheet, but the center and peripheral inserts are purchased separately and must not be swapped. When drilling stainless steel, maintain continuous cooling and a steady feed to limit work hardening and remove heat from the cutting zone.
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Application limitation
Grade WPM is not intended for hardened steels in the hardened condition (hard machining). The insert SPNT 060304 is a replaceable cutting edge for indexable drill bodies — it does not replace a solid carbide drill or an HSS drill.
Square insert designation decoder according to ISO 1832
how to read the SPNT 060304 code — positions 1–7 of the designation
Designation SPNT 060304 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
1Sshape 2Pangle α 3Ntolerance 4Ttype – 506size 603thickness 704radius rε
Positions 1–4 · ISO code
1SShape
Square 90°
4 corners of 90° per side
2PClearance angle
α = 11°
positive, single-sided
3NTolerance
Class N (intermediate)
IC ±0.05 · thickness ±0.13 mm
4TType
Countersunk hole + chip breaker
countersink 40–60°, single-sided chip breaker
Positions 5–7 · dimensions [mm]
506Size
l = 6.35 mm
IC = 6.35 mm (square: IC = l)
603Thickness
s = 3.18 mm
between rake faces
704Corner radius
rε = 0.4 mm
code ÷ 10 → radius in mm
✓ 4 corners × 1 side = 4 cutting edges
Full designation: SPNT 060304 = square 90° · positive 11° · class N · countersunk hole and chip breaker · IC 6.35 mm (l 6.35 mm) · s 3.18 mm · rε 0.4 mm
Compatibility of the SPNT 060304 insert with indexable drills
use in bodies for replaceable inserts and range of workpiece materials
Applications and compatibility of the SPNT 060304 insert
| ✔ | Indexable drills — steel body with pockets for replaceable inserts |
| ✔ | Center and peripheral inserts selected as a pair according to the body data sheet, purchased separately |
| ✔ | Unalloyed and alloy steel — ISO group P |
| ✔ | Stainless steel — ISO group M |
| ✔ | Gray and ductile cast iron — ISO group K |
| ✔ | Aluminum and nonferrous metals — ISO group N |
| ✗ | Solid carbide drills and HSS twist drills |
| ✗ | Hardened steels in the hardened condition (hard machining) |
Frequently asked questions about the SPNT 060304 insert
number of edges, tool selection, materials and dimensions
Four — the square shape provides 4 corners for cutting. When one edge becomes dull, index the insert in the body pocket to the next corner without replacing the entire drill. The insert is secured by a screw passing through the center hole.
Indexable drills with replaceable inserts — steel bodies with two pockets. Such a drill uses 2 inserts: a center insert near the axis and a peripheral insert at the outer edge. Both positions are selected as a cooperating pair according to the body data sheet, but the inserts are purchased separately and must not be swapped.
Grade WPM covers ISO groups P, M, K and N. Recommended cutting speeds: steel 50–75 m/min, stainless steel 35–50 m/min, cast iron 50–70 m/min, aluminum and nonferrous metals 80–100 m/min. Do not machine hardened materials.
The side length l is 6.35 mm, the insert thickness s is 3.18 mm, and the corner radius rε is 0.40 mm. This is a square, positive indexable insert from Walter in carbide grade WPM.
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Shipping
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| 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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