Cleveland
Cleveland C42297 4-flute HSS left-hand helix square end mill .25 in milling diameter
A 4-flute HSS left-hand helix square end mill with .25 in milling diameter, .625 in length of cut and 3/8 in shank
- TypeMilling
- 4-flute design improves chip evacuation in slotting
- Left-hand helix reduces workpiece lift on manual mills
- High-speed steel construction handles interrupted cuts
- Weldon flat shank prevents tool pull-out in holder
- 25 in diameter suits small-feature profiling
Cleveland C42297 4-Flute HSS End Mill
The Cleveland C42297 is a square end mill built from high-speed steel with a 0.25 inch milling diameter and a 3/8 inch shank. It features four flutes, a left-hand helix and a left-hand cut, plus a Weldon flat for positive retention. Overall length is 2 7/16 inches with a 0.625 inch length of cut. The tool is uncoated and does not support through-coolant.
Ideal for left-hand milling setups
Machinists who need a left-hand helix and cut to suit a specific spindle direction or material behaviour will find this cutter matches the requirement. The high-speed steel substrate works well for general-purpose milling in softer steels, aluminium and non-ferrous metals. Shops that require right-hand cutting geometry, coated tooling for higher heat resistance or through-coolant capability should select a different tool.
0.25 inch milling diameter defines the cut
The cutting diameter of 0.25 inch is the primary specification that determines whether this end mill fits the programmed tool path and workpiece feature size. A different diameter will not produce the intended slot, pocket or profile dimensions. Verify this measurement against the drawing before ordering.
Highlights
- 4-flute design improves chip evacuation in slotting
- Left-hand helix reduces workpiece lift on manual mills
- High-speed steel construction handles interrupted cuts
- Weldon flat shank prevents tool pull-out in holder
- 25 in diameter suits small-feature profiling
Specifications
| Brand | CLEVELAND |
|---|---|
| Type | Milling |
Questions about this item
Will the 0.625 in length of cut on the C42297 cause excessive heat during long milling sessions?
The high-speed steel construction and uncoated finish manage heat well at standard feeds; use coolant and avoid pushing the 0.25 in diameter beyond recommended chip loads to keep temperatures stable.
What tool holder do I need for the 3/8 in shank with Weldon flat on this end mill?
A standard 3/8 in Weldon-compatible collet or end-mill holder with a set-screw flat is required; the flat prevents the cutter from spinning under heavy radial loads.
Can the left-hand helix on the C42297 pull chips clear when I run it on my older manual knee mill?
Yes, the left-hand helix directs chips away from the cut on conventional rotation, which works well on manual machines provided the spindle turns clockwise and the workpiece is rigidly clamped.
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