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Cleveland C39644 HSS end mill .3125 in diameter .75 in cut length uncoated Weldon flat shank

Cleveland

Cleveland C39644 HSS End Mill .3125 in D .75 in Cut L pneumatic accessory

SKU CH-CNJK-1Z9VM

High-speed steel square end mill with a 0.3125 in diameter and 0.75 in cut length for milling tasks

  • TypeMilling
  • High-speed steel construction resists wear during milling operations
  • 3125-inch diameter suits precise slot and pocket cutting
  • 75-inch length of cut enables deeper passes in one operation
  • Weldon flat shank prevents tool slippage in standard holders
  • 39644 model delivers reliable performance for general-purpose machining

Cleveland C39644 HSS End Mill

The Cleveland C39644 is a high-speed steel square end mill designed for general-purpose milling in ferrous and non-ferrous materials. Its uncoated finish suits shops that prefer to apply their own coatings or run dry. The Weldon flat shank provides a secure grip in standard tool holders. Machinists and maintenance teams use it for slotting, profiling and pocketing tasks.

Weldon Flat and Uncoated Surface

The Weldon flat on the 3/8 in shank prevents the tool from spinning under heavy feed rates, reducing scrap and holder wear. Because the flute surface is uncoated, operators can apply a preferred coating in-house or run the tool as-received for materials that do not demand a specialised layer. This flexibility simplifies inventory for job shops that handle varied workpiece alloys.

5/16 in Diameter and 3/4 in Length of Cut

The 5/16 in cutting diameter and 3/4 in length of cut allow the mill to reach into shallow pockets and produce clean slots in a single pass. Overall length of 2 1/2 in gives adequate clearance for most vise setups without excessive overhang. The tool is not suited for deep-cavity work or high-speed aluminium roughing where specialised geometries and coatings outperform uncoated HSS.

Highlights

  • High-speed steel construction resists wear during milling operations
  • 3125-inch diameter suits precise slot and pocket cutting
  • 75-inch length of cut enables deeper passes in one operation
  • Weldon flat shank prevents tool slippage in standard holders
  • 39644 model delivers reliable performance for general-purpose machining

Specifications

BrandCLEVELAND
TypeMilling

Questions about this item

Will the uncoated high-speed steel flutes on the .3125 in end mill need frequent re-sharpening?

Uncoated HSS dulls faster than coated tools, so plan to re-sharpen or replace the cutter once edge wear affects finish or dimensions.

What limits continuous cutting with the .75 in length of cut on this Weldon-shank mill?

Chip evacuation in deep slots and heat build-up in the uncoated flutes become the practical limits during prolonged heavy cuts.

How much heat and noise does the 3/8 in shank tool generate in all-day milling?

Expect typical HSS heat levels — warm shank and moderate router noise — managed with flood coolant and secure Weldon clamping.

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