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Tapered ball-nose end mill with coated carbide finish

YINGHUA

YINGHUA R0.25x20.5xD4x50L HRC55 Tapered Ball Nose End Mill Carbide Cutter

SKU CH-QYW3-GY8KD

Tungsten carbide tapered ball-nose cutter with 0.25 mm tip radius, 20.5 mm flute length and 50 mm overall length for precision CNC milling

  • Product typeRight-Angle Drills
  • HRC55 hardness resists wear on tough materials
  • R0.25 tip radius enables fine detail engraving
  • 5 mm flute length reaches deep cavities
  • 50 mm overall length fits standard CNC holders
  • Tungsten carbide substrate handles high cutting speeds

YINGHUA R0.25 Tapered Ball Nose End Mill

This new solid tungsten carbide cutter features a 0.25 mm corner radius, a 20.5 mm cutting length and a 50 mm overall length. It carries an HRC55 hardness rating and is coated for CNC milling operations. The shank diameter is 4 mm.

Suited for precision contouring

The tool is intended for industrial cutting and engraving only and must not be used by anyone under 18 years of age. It is not designed for hand-held drilling or general-purpose fastening tasks. Buyers who need a drill bit for standard hole-making should look elsewhere.

0.25 mm corner radius with 20.5 mm cutting length

This single specification determines whether the cutter can produce the required fillet size and reach the necessary depth in your workpiece. The 50 mm overall length and 4 mm shank must also match your machine holder and clearance requirements.

How it compares

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

Price $19.99
Cheaper than about 83% 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 in my CNC collet, and what step do people often miss?

Insert the 3.175 mm shank fully into a matching ER collet, tighten the nut to the correct torque, and verify the 50 mm overall length clears the workpiece — many forget to check the 20.5 mm flute reach against their part depth.

When will the HRC55 tungsten carbide cutter need replacement under normal milling?

Replace the tool when the R0.25 ball nose radius shows visible wear or chipping, as the hardened 55 HRC coating cannot be re-sharpened without specialist equipment.

What limit appears first during a long 3D contouring pass with this tapered ball nose?

Heat buildup in the 20.5 mm flute length typically limits sustained feed rates before the solid carbide body reaches its structural limit.

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