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Solid carbide router bit, down-spiral O-flute, quarter-inch cutter diameter

Onsrud

Onsrud 62-620 Down Spiral O-Flute Router Bit 1/4 3/8 hand tool

SKU CH-M269-38K68 MPN 62-620

Carbide router bit with down-spiral O-flute geometry for clean cuts in aluminium

  • Product typeHole, Drill, Bore & Wire Gauges
  • Main materialCarbide
  • Downcut spiral ejects chips downward for clean top edges on aluminium
  • Solid carbide construction resists wear during high-speed routing operations
  • O-flute geometry reduces heat buildup in soft-metal applications
  • 1/4 inch cutter diameter suits precision detail work
  • California Proposition 65 warning applies to this product

Solid carbide router bit

The Onsrud 62-620 is a solid carbide router bit designed with a down-spiral O-flute geometry. It is intended for machining aluminium and similar non-ferrous materials. The cutter diameter is 1/4 inch. This tool is supplied new for workshop and production use.

Primary application aluminium

The bit suits users cutting aluminium who need efficient chip evacuation downward to protect the top surface. It is not designed for handheld drilling or general-purpose hole sawing. Builders requiring upcut chip removal or a different cutter diameter should select another tool.

1/4 inch cutter diameter

The 1/4 inch cutter diameter determines the width of cut and tool clearance. Verify this dimension matches the required slot or hole size before purchase. The solid carbide construction provides wear resistance for the specified material.

How it compares

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

Price $50.99
Pricier than about 73% of the 2,474 comparable items (median $23.99).

Specifications

Product
Brand nameOnsrud
Model name62-620
Product typeHole, Drill, Bore & Wire Gauges
Size & build
Main materialCarbide

Questions about this item

How do I install the 1/4 in cutter diameter bit in my router collet and what step is often missed?

Insert the carbide shank fully into the collet, tighten securely, and verify the downcut spiral orientation matches the feed direction; the step often missed is confirming the flute direction before cutting.

What maintenance will the carbide O-flute bit need after extended use in aluminium?

Clean resin buildup from the O-flute after each session, inspect the cutting edges for chipping, and resharpen or replace the bit when edge wear reduces cut quality in aluminium.

At what point does chip evacuation become the limiting factor during sustained downcut routing?

The downcut spiral forces chips downward, so deep or high-feed cuts in aluminium will pack the flute first, requiring reduced depth per pass or frequent bit withdrawal to clear chips.

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