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Cleveland C39581 HSS end mill, silver steel cylinder with fluted cutting end and smooth shank

Cleveland

Cleveland C39581 HSS End Mill 5/16 in D 3/4 in Cut L pneumatic accessory

SKU CH-NA3B-JRD3V

High-speed steel square end mill with a 0.3125 inch cutting diameter and 0.75 inch length of cut for milling operations

  • TypeMilling
  • High-speed steel resists wear during milling
  • 5/16 inch diameter suits precise cuts
  • 3/4 inch length of cut removes more material per pass
  • Weldon flat shank locks securely in holders
  • 3-1/2 inch overall length reaches deeper cavities

Cleveland C39581 HSS End Mill 5/16 in

This Cleveland C39581 end mill is a square-end milling cutter made from high-speed steel with an uncoated finish. It features a Weldon flat shank for secure holding in compatible tool holders. The cutter has a milling diameter of .3125 in and an overall length of 3 1/2 in.

Suited for general-purpose milling in ferrous

Machinists performing slotting, profiling, or pocketing operations in steel, aluminium, or brass will find this tool appropriate. The .75 in length of cut supports moderate-depth passes. Shops requiring coated tools for high-temperature alloys or abrasive composites should select a different cutter.

Critical spec: .3125 in milling diameter

This single dimension determines whether the tool fits your holder and matches the required feature size. Verify that your machine spindle or collet accepts a 3/8 in Weldon flat shank and that the .3125 in diameter meets the design specification before ordering.

Highlights

  • High-speed steel resists wear during milling
  • 5/16 inch diameter suits precise cuts
  • 3/4 inch length of cut removes more material per pass
  • Weldon flat shank locks securely in holders
  • 3-1/2 inch overall length reaches deeper cavities

Specifications

BrandCLEVELAND
TypeMilling

Questions about this item

How do I install the 3/8 in shank with Weldon flat into my tool holder, and what step is often missed?

Insert the shank fully so the Weldon flat seats against the set screw, then tighten the screw onto the flat — not the round shank — to prevent slippage under load.

When will the uncoated high-speed steel cutting edges need replacement or resharpening?

Replace or resharpen when flank wear reaches roughly 0.3 mm or when cutting forces rise noticeably; uncoated HSS dulls faster in abrasive alloys than coated alternatives.

What limit appears first during a long slotting cut in steel with the 3/4 in length of cut?

Chip evacuation in the deep 3/4 in slot typically becomes the bottleneck before tool deflection, especially at standard HSS speeds and feeds.

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