55 Series 4-Flute 35° Coated Endmill | Imperial General Purpose Milling Tool

HRC55 4-Flute Solid Carbide End Mill Imperial TiSiN coated

The 55 series HN55 S4 is a professional-grade 4-flute solid carbide end mill engineered for demanding finishing, profiling, and slotting in hardened and tough metals. Available in HRC55 hardness, it combines a robust micro-grain carbide core with high-rigidity geometry and optional premium coatings for extended tool life and precision in machining applications.

Geometry & Benefits

• 4-flute design: Enhances tool rigidity and control—ideal for achieving high accuracy in finish cuts and shallow slots.

• HRC55 micro-grain carbide: Provides outstanding wear resistance and hardness, enabling durable performance in hardened steels and tool steels.

• 35° helix angle: Offers a balanced blend of smooth cutting, chip evacuation, and vibration damping—excellent for a range of complex materials

• Ideal for demanding machining: Built to last, high-rigidity CNC milling environments or tough manual operations.

Typical Uses & Applications

• Finishing, light profiling, and shallow slotting in mould steels, carbon steels, alloy steels, and cast irons.

• Suitable for both production CNC setups and rigid manual milling, where reduced deflection is critical.

1/8, 3/8 Cut length, 1-1/2" OAL

3/16, 5/8 Cut length, 2" OAL

1/4, 3/4 Cut length, 2-1/2" OAL

5/16, 13/16 Cut length, 2 -1/2" OAL

3/8, 1-3/8" Cut length, 2-1/2" OAL

1/2, 1-1/2" Cut length, 3" OAL