Cleveland
Cleveland C33439 4-Flute HSS Square End Mill .21875 in
4-flute HSS square end mill with TiN coating cuts 0.21875 in diameter, 1.75 in length of cut, 3/8 in shank
- TypeMilling
- Four-flute HSS geometry gives smooth cuts in general milling
- TiN coating reduces wear and extends tool life in production runs
- Center-cutting design allows plunge cuts without a pilot hole
- 75 in length of cut reaches deep features in one pass
- Weldon flat shank locks securely in standard 3/8 in holders
Cleveland C33439 4-Flute HSS End Mill
This Cleveland C33439 is a 4-flute high-speed steel square end mill designed for general-purpose milling operations. It suits machinists and maintenance technicians who need a reliable center-cutting tool for slotting and profiling tasks in a variety of materials.
TiN Coating and Weldon Flat Benefits
The titanium nitride coating increases surface hardness and reduces friction, which extends tool life and allows higher cutting speeds compared to uncoated HSS. The Weldon flat on the 3/8 inch shank provides a secure, anti-slip grip in standard end mill holders, preventing tool pull-out during heavy cuts.
Installation Notes and Common Issues
Installation is straightforward: insert the shank into a compatible Weldon holder and tighten the set screw firmly against the flat. The main issue arises if the holder lacks a set screw or uses an incorrect bore size, which leads to runout or the tool spinning in the holder. This tool is not for applications requiring coolant-through capability or a reduced neck diameter for deep cavity reach.
Highlights
- Four-flute HSS geometry gives smooth cuts in general milling
- TiN coating reduces wear and extends tool life in production runs
- Center-cutting design allows plunge cuts without a pilot hole
- 75 in length of cut reaches deep features in one pass
- Weldon flat shank locks securely in standard 3/8 in holders
Specifications
| Brand | CLEVELAND |
|---|---|
| Type | Milling |
Questions about this item
When will the TiN coating on this .21875 in end mill need to be replaced?
The TiN coating wears gradually during use; once the gold colour fades and the underlying high-speed steel is exposed, cutting performance drops and the tool should be replaced.
What limits continuous cutting with the 1.75 in length of cut on this HSS mill?
Heat buildup in the high-speed steel flutes is the first limit during sustained cuts; without coolant-through capability the tool will lose hardness if temperatures rise too far.
How much noise and heat does the 3/8 in shank Weldon flat produce during all-day milling?
The tool itself generates no noise; spindle and workpiece create the sound, while heat depends on feed, speed and coolant — the Weldon flat simply secures the 3/8 in shank in the holder.
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