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Solid carbide O-flute upcut router bit, quarter-inch cutting diameter

Onsrud

Onsrud 63-724 Routing End Mill Up O-Flute 1/4 3/8 2 hand tool

SKU CH-JA3Q-MZ62Z MPN 63-724

Carbide upcut O-flute router bit for hard plastics, 1/4 inch cutter diameter

  • Product typeHole, Drill, Bore & Wire Gauges
  • Main materialCarbide
  • Solid carbide construction resists wear during extended routing
  • Upcut O-flute geometry clears chips efficiently from hard plastics
  • 1/4 inch cutter diameter suits precision milling tasks
  • 3/8 inch shank fits standard collets securely
  • Two-flute design balances finish quality with feed rate

Carbide routing end mill for hard plastic

The Onsrud 63-724 is a solid carbide router bit with a spiral O-flute upcut geometry. It is designed for routing operations in hard plastic materials. The cutter diameter is 1/4 inch. This tool is intended for precision milling tasks.

CNC operators and plastics fabricators

The upcut spiral clears chips upward, making it suitable for through-cuts and deep pocketing in hard plastic. Buyers who need a downcut action for improved top-surface finish or who work primarily with soft plastics, wood, or metals should look at something else.

1/4 inch cutter diameter

The 1/4 inch cutter diameter determines the minimum internal radius and the material removal rate per pass. Verify that your collet or tool holder accepts this shank size and that your machine rigidity suits the cutting forces involved.

How it compares

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

Price $33.99
Pricier than about 63% of the 2,474 comparable items (median $23.99).

Specifications

Product
Brand nameOnsrud
Model name63-724
Product typeHole, Drill, Bore & Wire Gauges
Size & build
Main materialCarbide

Questions about this item

Should I pick the 1/4 in or 3/8 in cutter diameter for hard plastic routing?

The 1/4 in cutter diameter suits finer detail and smaller pockets in hard plastic, while the 3/8 in diameter removes material faster on larger profiles; choose based on the feature size you need to cut.

What does the upcut O-flute geometry do when the bit is in a CNC router?

The upcut spiral pulls chips up and out of the cut, reducing heat build-up and preventing chip welding in hard plastic, while the O-flute shape creates a cleaner edge finish.

How does the solid carbide construction affect performance on a CNC machine?

Solid carbide maintains sharpness longer than high-speed steel, resists deflection during deep cuts in hard plastic, and allows higher feed rates without premature wear.

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