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Micro 100 carbide end mill, 1/4 inch shank, four flutes, uncoated finish

Micro 100

Micro 100 GEM-250-4 Carbide End Mill 1/4 in 4FL Uncoated

SKU CH-8Y4V-JCYH7

Carbide square end mill with a 0.25 in diameter, 0.75 in cut length and 2 1/2 in overall length

  • Product typeHole, Drill, Bore & Wire Gauges
  • Main materialCarbide
  • Product weight0.01
  • Carbide construction resists wear for longer tool life
  • Four-flute design improves chip evacuation and surface finish
  • Uncoated surface suits general-purpose milling across materials
  • Quarter-inch shank fits standard collets and holders
  • Length of cut 0.75 in enables deeper profiling passes

Micro 100 1/4 in Carbide End Mill

The Micro 100 GEM-250-4 is a solid carbide square end mill with a 0.25 in milling diameter and four flutes. It is intended for machinists and fabricators who need a general-purpose uncoated tool for milling operations in a variety of materials. The straight shank matches the cutting diameter at 1/4 in and the overall length is 2 1/2 in.

Installing the end mill in a collet or holder

Secure the 1/4 in shank in a compatible collet or end mill holder with adequate clamping force to prevent slippage during cutting. Because the tool is uncoated, chip evacuation relies on proper coolant or air blast; inadequate evacuation often leads to built-up edge and premature wear. Runout should be minimised at the holder to avoid chatter and poor surface finish.

Checks before ordering

Verify that your machine spindle accepts a 1/4 in shank and that the 2 1/2 in overall length fits within your work envelope and tool changer limits. Confirm the 0.75 in length of cut provides sufficient reach for your part geometry without excessive overhang. This tool is not suited for buyers who require a coated cutter for high-temperature alloys or abrasive composites.

How it compares

Measured against everything we stock in Utility & Specialty Hand Tools, at today’s prices. Recalculated every night.

Price $28.99
Pricier than about 57% of the 2,474 comparable items (median $23.99).

Specifications

Product
Brand nameMicro 100
Product typeHole, Drill, Bore & Wire Gauges
Size & build
Main materialCarbide

Questions about this item

How do I confirm the end mill is cutting correctly after setup?

Check for a smooth finish and consistent chip formation when milling a 0.25 in diameter slot at 0.75 in depth.

What comes in the box and what must I source separately?

The package contains the uncoated carbide end mill only; tool holders, collets and coolant are not included.

Which size should I choose for a 1/4 in shank requirement?

Select the GEM-250-4 with a 1/4 in shank diameter and 0.25 in milling diameter to match your holder.

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