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Tungsten carbide tapered ball nose end mill with coated finish

YINGHUA

YINGHUA R0.25x30.5xD6x75L HRC55 Tapered Ball Nose End Mill

SKU CH-BZP9-P93DP

A tungsten carbide tapered ball nose end mill with R0.25 radius, 30.5 mm flute length and 75 mm overall length for precision CNC milling

  • Product typeRight-Angle Drills
  • Precision profiling with R0.25 mm ball nose
  • 5 mm reach for deep cavity access
  • HRC 55 tungsten carbide resists wear
  • Coated solid carbide handles high-speed CNC cuts
  • 75 mm overall length fits standard tool holders

Tapered Ball Nose End Mill R0.25

This tungsten solid carbide end mill features a tapered cone profile with a 0.25 mm ball nose radius and a 30.5 mm cutting length. The 75 mm overall length and HRC55 hardness suit precision CNC milling and engraving tasks. A protective coating extends tool life in abrasive materials.

Suited for detailed CNC engraving not heavy roughing

Machinists producing fine contours, jewellery moulds or intricate 3D surfaces will benefit from the narrow taper and small ball nose. The tool is not designed for high-material-removal roughing, deep pocketing or hand-held drilling. Buyers needing larger radii or standard straight flutes should consider other geometries.

0.25 mm ball nose radius defines detail limit

The 0.25 mm radius sets the minimum achievable corner fillet and surface finish resolution. Shank options include 3.175 mm, 4 mm, 6 mm and 8 mm with total lengths from 38 mm to 100 mm. Select the shank that matches your collet and the length that clears your workpiece.

How it compares

Measured against everything we stock in Power Drills, Drivers & Cutting Bits, at today’s prices. Recalculated every night.

Price $33.99
Cheaper than about 70% of the 2,412 comparable items (median $81.99).

Specifications

Product
Product typeRight-Angle Drills

Questions about this item

How do I install the 3.175 mm shank end mill and what step causes runout?

Clamp the 3.175 mm shank fully into a clean ER collet or shrink-fit holder, then torque the nut to the holder maker's spec; the step most skip is verifying runout with a dial indicator before cutting.

When will the coated tungsten carbide cutter need replacement?

Replace the tool when the ball-nose radius wears past 0.25 mm or the coating shows micro-chipping, which typically appears after prolonged profiling in hardened steel above HRC 55.

At what length does deflection become the limiting factor on a 75 mm overall tool?

With 75 mm overall length and 30.5 mm reach, deflection grows rapidly once axial depth exceeds roughly one-third of the reach, so reduce step-over or rpm when cutting deep pockets.

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