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Cylindrical cobalt roughing end mill with four flutes and Weldon flat shank

Cleveland

Cleveland C30710 4-Flute Cobalt 8% Coarse Square Roughing End Mill

SKU CH-A2FJ-EHY3E

A 4-flute cobalt roughing end mill with a 0.4375 in diameter and 1.25 in length of cut for heavy material removal

  • Product typeMilling
  • Coarse 4-flute geometry removes material quickly
  • 8% cobalt construction resists heat during heavy cuts
  • 25 in length of cut handles deep slots
  • .4375 in diameter suits medium profiling work
  • Weldon flat shank locks securely in standard holders

Cleveland C30710 roughing end mill

The Cleveland C30710 is a 4-flute cobalt 8% coarse square roughing end mill designed for heavy material removal in milling operations. It suits machinists and maintenance teams who need aggressive stock removal without a fine finish. The uncoated cobalt substrate handles high cutting forces in steel and tough alloys. This tool is not for finish passes or applications requiring tight surface tolerances.

Sustained cutting performance

Under sustained load the coarse pitch and four-flute design break chips into manageable segments, reducing heat buildup in the cutting zone. The 1.25 in length of cut allows deep engagement while the cobalt body resists softening at elevated temperatures. The Weldon flat shank prevents pull-out during high-torque cuts. The tool is not suited for high-speed finishing or light finishing passes where vibration would degrade surface quality.

Weldon shank interface limits

The 1/2 in Weldon shank fits standard end-mill holders and provides positive drive through the set-screw flat. The .4375 in milling diameter and 3 1/4 in overall length define the reach and clearance envelope for a given setup. Non-coolant-through construction means external flood or mist coolant must reach the flutes directly. The tool cannot be used with through-spindle coolant systems or holders that require internal passages.

How it compares

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

Price $62.99
Pricier than about 73% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCLEVELAND
Product typeMilling

Questions about this item

How much heat does the 4-flute cobalt 8% coarse roughing end mill generate when running all day in steel?

The uncoated cobalt tool produces noticeable heat in prolonged cuts; use flood coolant and reduce the 1.25 in length-of-cut engagement to keep temperatures manageable.

What holder or machine interface is required for the .4375 in diameter end mill with a 1/2 in Weldon flat shank?

A standard 1/2 in Weldon flat end-mill holder on a milling machine or CNC spindle is needed; the flat prevents pull-out during heavy roughing.

Will the C30710 fit in an older Bridgeport-style mill that only accepts 1/2 in straight shanks without a flat?

No — the Weldon flat requires a set-screw holder; a plain 1/2 in collet or straight-shank adapter will not clamp the flat securely.

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