We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Silver cylindrical end mill with four spiral flutes and a flat shank end

Cleveland

Cleveland C33439 4-Flute HSS Square End Mill .21875 in

SKU CH-C2Z2-9P5EP

4-flute HSS square end mill with TiN coating cuts 0.21875 in diameter, 1.75 in length of cut, 3/8 in shank

  • Product 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.

How it compares

Measured against everything we stock in Bits, Hole Saws & Accessory Kits, at today’s prices. Recalculated every night.

Price $30.99
Typical for this category: the median of 5,493 items is $27.99.

Specifications

Product
Brand nameCLEVELAND
Product typeMilling

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.

More in Bits, Hole Saws & Accessory Kits

Similar items