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Unibor 25430 annular cutter, 15/16 inch diameter, 4 inch depth, M42 cobalt finish with pilot pin

Unibor

Unibor 25430 15/16 x 4 M42 Cobalt Annular Cutter with Pilot Pin

SKU CH-BBJF-YMYDK

A 15/16 inch M42 cobalt annular cutter with 4 inch depth of cut and pilot pin for mild and stainless steels

  • 30% longer tool life from M42 cobalt alloy
  • Cuts mild steel, stainless and softer metals
  • 4 inch depth of cut for thick workpieces
  • Includes pilot pin for accurate hole starts
  • Model 25430 built for heavy-duty drilling

Unibor 25430 Cobalt Cutter 15/16 inch

The Unibor 25430 is a premium M42 cobalt annular cutter designed for magnetic drilling machines. It targets metalworkers who need reliable holes in mild steel and stainless steel. The cobalt alloy construction provides extended tool life during repetitive cutting tasks. A pilot pin is included to ensure accurate hole alignment from the start.

Replaces standard HSS cutters for longer service

This cutter replaces conventional high-speed steel annular cutters when tool life is the priority. The cobalt alloy delivers thirty percent longer life than HSS under comparable conditions. The upgrade is worth it for workshops that frequently cut stainless steel or harder mild steels. It is not suited for buyers who need larger diameter holes beyond the fifteen sixteenths specification.

Limited to four inch cutting depth

The practical limit of this annular cutter is its four inch maximum depth of cut. Deeper holes require a different tool or multiple passes with an extended pilot. The M42 cobalt material excels in softer metals and stainless steels but is not optimised for very hard alloys or abrasive non-metallics. Users must match the cutter to the magnetic drill capacity and workpiece thickness.

How it compares

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

Price $130.99
Pricier than about 89% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameUNIBOR

Questions about this item

Will the 15/16 inch cutter fit a standard 3/4 inch Weldon shank arbor?

The Unibor 25430 uses a 3/4 inch Weldon shank, so it fits most magnetic drill arbors without an adapter.

How do I install the pilot pin correctly for a 4 inch depth of cut?

Insert the pilot pin through the centre hole until it seats fully; the pin must extend past the cutter teeth to start the hole accurately.

When should I replace the cobalt cutter instead of resharpening it?

Replace the M42 cobalt cutter when tooth wear reduces cutting efficiency or if chips show excessive heat discolouration.

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