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Cleveland C38964 2-flute HSS square end mill with TiCN coating

Cleveland

Cleveland C38964 2-Flute HSS Keyway Tolerance Square Single End Mill

SKU CH-R8SG-B9G6W

High-speed steel end mill with TiCN coating for keyway milling in steel and ferrous alloys

  • Product typeMilling
  • 2-flute design clears chips efficiently in keyways
  • HSS construction resists wear during extended cutting sessions
  • TiCN coating reduces friction and extends tool life
  • Center-cutting geometry allows plunge cuts without pre-drilling
  • Keyway tolerance ensures precise slot dimensions every time

Cleveland 2-Flute HSS Keyway End Mill

The Cleveland C38964 is a high-speed steel square end mill built for keyway tolerance milling. Its two-flute center-cutting design suits machinists and maintenance teams cutting precise slots in ferrous materials.

TiCN coating and inch shank implications

A TiCN coating increases surface hardness and reduces friction during prolonged cuts. The inch-based shank fits standard tool holders directly, so setup time stays short on manual or CNC knee mills without adapter sleeves.

Practical limits of HSS tooling

High-speed steel wears faster than carbide on abrasive alloys or high-speed production runs. The two-flute geometry limits chip evacuation in deep pockets, so aggressive feed rates in sticky materials can lead to clogging or premature edge breakdown.

How it compares

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

Price $25.99
Typical for this category: the median of 5,493 items is $27.99.

Specifications

Product
Brand nameCLEVELAND
Product typeMilling

Questions about this item

What shank diameter does the 3/8 in milling diameter end mill use for tool-holder fit?

The 3/8 in milling diameter typically pairs with a 3/8 in shank, so it fits standard 3/8 in collets or end-mill holders without a reducing sleeve.

What physical clearance does the 9/16 in length of cut require inside the workpiece?

The 9/16 in length of cut needs at least 9/16 in of open depth in the slot or pocket, plus extra clearance for chip evacuation and tool overhang.

How is the TiCN-coated HSS end mill installed in a milling machine, and what step is often missed?

Secure the 3/8 in shank in a matched collet or end-mill holder, torque to the holder spec, then verify the 9/16 in flute length clears the fixture — operators often skip the clearance check.

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