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Rainbow Coated Solid Carbide Inner Radius End Mill for Steel

Rainbow-coated solid carbide inner radius end mill for precise corner rounding and deburring in steel, stainless steel and cast iron.

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Special-Purpose Solid Carbide End Mills

Rainbow Coated Solid Carbide Inner Radius End Mill for Steel

Precision corner rounding, edge profiling and deburring for steel, stainless steel and cast iron.

Product Overview

PENGFU rainbow-coated solid carbide inner radius end mills are designed for precision corner rounding, edge profiling and deburring in steel, stainless steel and cast iron.

The precision-ground concave cutting profile produces accurate and consistent external corner radii. High-quality solid carbide and a wear-resistant PVD coating provide excellent cutting stability, heat resistance and extended tool life.

Product Features

Precision Radius ProfileThe accurately ground concave cutting edge produces consistent external corner radii with high dimensional accuracy.
Wear-Resistant PVD CoatingThe colorful PVD coating improves surface hardness, heat resistance and wear resistance during steel machining.
High-Rigidity CarbideThe solid carbide body provides excellent rigidity and helps reduce vibration during contour and radius machining.
Stable CuttingOptimized cutting geometry distributes cutting forces evenly and provides stable performance in steel and cast iron.
Excellent Surface FinishSharp cutting edges produce a smooth radius surface and reduce secondary polishing or deburring.
Extended Tool LifePremium carbide and protective coating help maintain cutting-edge sharpness during continuous machining.

Recommended Materials

  • Carbon steel
  • Alloy steel
  • Tool steel
  • Mold steel
  • Pre-hardened steel
  • Stainless steel
  • Grey cast iron
  • High-alloy cast iron

Recommended hardness: Up to approximately HRC55, depending on the carbide grade, coating, machine rigidity and cutting conditions.

Typical Operations

  • External corner rounding
  • Edge profiling
  • Radius forming
  • Contour machining
  • Part-edge deburring
  • Mold finishing
  • Component finishing
  • Decorative radius machining

Reference Specifications

Unit: mm

Cutter Dia. D1 Radius R Shank Dia. D2 Overall Length L2
4 R0.5 4 50
4 R0.75 4 50
4 R1.0 4 50
6 R1.5 6 50
6 R2.0 6 50
6 R2.5 6 50
8 R3.0 8 60
10 R4.0 10 60
12 R5.0 12 60
14 R6.0 14 75
16 R7.0 16 75

The specifications above are for selection reference only. Final cutter diameter, radius, overall length and coating should be confirmed before ordering.

Dimension Description

D1: Cutter diameterR: Cutting radiusD2: Shank diameterL2: Overall length

Reference Cutting Parameters

Suggested starting parameters. Adjust according to cutter diameter, radius, workpiece hardness, machine rigidity and tool overhang.

Workpiece Material Cutting Speed Vc Recommended Method
Carbon Steel, below HRC35 100–180 m/min Light radial engagement
Alloy Steel, HRC35–45 70–140 m/min Reduce speed and use multiple passes
Tool/Mold Steel, HRC45–55 50–100 m/min Stable coolant and light finishing passes
Stainless Steel 50–100 m/min Reduce heat and avoid tool rubbing
Cast Iron 100–160 m/min Dry cutting or air cooling

For large-radius profiles, rough-machine the edge first and complete the final radius using one or more light finishing passes.

Customization & OEM Service

Custom radius size, cutter diameter, shank diameter, cutting width, overall length, flute quantity, carbide grade, PVD coating, OEM laser marking and customized packaging are available.

Need an Inner Radius End Mill?

Contact PENGFU TOOLS for cutter selection, radius recommendations, machining parameters and a competitive quotation.

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