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Onsrud 57-287 carbide router bit with spiral downcut flutes

Onsrud

Onsrud 57-287 carbide hand tool

SKU CH-X08D-B5TD8 MPN 57-287

Carbide routing end mill with downcut spiral for clean edges in MDF and wood

  • Product typeHole, Drill, Bore & Wire Gauges
  • Main materialCarbide
  • Carbide construction resists wear for longer tool life
  • Downcut spiral prevents tear-out on MDF and wood surfaces
  • 1/4 inch cutter diameter suits precision routing tasks
  • Solid router bit design ensures rigidity during heavy cuts
  • California Proposition 65 warning informs safe handling practices

Solid Carbide Router Bit

The Onsrud 57-287 is a solid carbide end mill built for routing operations on MDF and wood. Its downcut spiral geometry pushes chips downward to protect the top surface from tear-out. The cutter diameter is 1/4 inch and the cutting length is 1 1/8 inches. It is supplied new and ready for use.

Suited For Clean Top Edges

Woodworkers and CNC operators who need a clean upper face on through-cuts or pocketing will benefit from the downcut action. Buyers who require chips to be evacuated upward for deep mortises or who prefer an upcut spiral for faster material removal should look at a different geometry.

1/4 Inch Cutter Diameter

The 1/4 inch cutter diameter determines the minimum inside radius and the toolholder size required. Confirm that your collet or tool holder accepts this shank size before ordering.

How it compares

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

Price $41.99
Pricier than about 69% of the 2,474 comparable items (median $23.99).

Specifications

Product
Brand nameOnsrud
Model name57-287
Product typeHole, Drill, Bore & Wire Gauges
Size & build
Main materialCarbide

Questions about this item

How often will the carbide cutting edges need sharpening or replacement?

Carbide edges keep their sharpness far longer than high-speed steel, so resharpening intervals are measured in many hours of MDF or wood routing rather than days.

What limits continuous cutting before the tool must be withdrawn?

Heat buildup in the solid carbide body and chip packing in the downcut flutes are the first limits during sustained routing.

How much noise and heat does the bit generate during all-day CNC routing?

The downcut spiral forces chips downward, reducing airborne dust and vibration, while carbide dissipates heat efficiently for steady, quieter operation.

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