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Unibor 25424 M42 cobalt annular cutter with pilot pin

Unibor

Unibor 25424 3/4in X 4in M42 Cobalt Annular Cutter with Pilot Pin

SKU CH-1V16-DQYV3

M42 cobalt annular cutter cuts softer metals, mild and stainless steels with 30% longer life than HSS at 4in depth

  • 30% longer tool life versus standard HSS cutters
  • M42 cobalt alloy handles mild and stainless steels
  • 4 inch depth of cut suits thick workpieces
  • Pilot pin included for accurate hole starts
  • Premium Unibor construction built for heavy-duty use

Premium M42 Cobalt Annular Cutter

The Unibor 25424 is a 3/4in by 4in annular cutter built from premium M42 cobalt alloy. It is designed for professionals cutting softer metals, mild steel and stainless steel. The cobalt construction delivers a 30% longer life compared to standard high-speed steel alternatives.

Build integration and clearance

The 4in depth of cut lets you complete deeper holes in a single pass, reducing the need for step drilling or multiple tool changes. Its annular geometry removes only the hole perimeter, which lowers power demand and frees up machine capacity for other operations. The included pilot pin centres the cutter automatically, simplifying alignment on magnetic drills or drill presses.

Bundled pilot pin benefit

The supplied pilot pin ejects the slug at the end of each cut, preventing material buildup and keeping the cutting edges clear. This automatic ejection speeds up repetitive drilling cycles and reduces downtime spent clearing debris. No additional software or accessories are included with this cutter.

How it compares

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

Price $121.99
Pricier than about 87% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameUNIBOR

Questions about this item

How long does the M42 cobalt cutter last compared to standard HSS before needing replacement?

The cobalt alloy delivers 30% longer life than HSS when cutting mild and stainless steels.

Does the 4in depth of cut generate enough heat to require coolant during all-day drilling?

The 4in cutting depth works with standard cutting fluids to manage heat in continuous operation.

What shank size must my magnetic drill press accept to mount this 3/4in cutter?

The cutter uses a standard 3/4in shank that fits most magnetic drill presses with matching arbor.

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