Unibor
Unibor 25430 15/16 x 4 M42 Cobalt Annular Cutter with Pilot Pin
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.
Highlights
- 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
Specifications
| Brand | UNIBOR |
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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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