Disco 13004 Drill Bit 25/32" 1/2" Shank

Disco 13004 drill bit 25/32 inch

The Disco 13004 is a twist drill bit with a 25/32 inch cutting diameter and a 1/2 inch shank. It is built for machinists and maintenance technicians who need to produce accurate holes of this specific size in metal or wood. The straight shank fits standard drill presses and heavy-duty handheld drills that accept 1/2 inch capacity chucks. This tool addresses the need for a single large-diameter cutter without requiring a reduced-shank adapter.

Capacity and headroom for 25/32 inch holes

The bit cleanly drills 25/32 inch diameter holes through mild steel, aluminium, and hardwood when used at appropriate speeds and with cutting lubricant. Its flute length provides enough chip clearance for through-holes in standard plate and bar stock. The fixed diameter means it cannot produce smaller or larger holes, and the 1/2 inch shank limits use to machines with matching chuck capacity. It runs out when the workpiece thickness exceeds the flute length or when a different hole size is required.

Upgrade from smaller bits and step drills

This bit replaces sets of smaller twist drills or step drills when a precise 25/32 inch hole is needed repeatedly without reaming. The jump is worth it for production runs where a dedicated size reduces cycle time and improves concentricity compared to stepping up through multiple diameters. It does not suit jobs that demand variable hole sizes, countersinking, or shank diameters smaller than 1/2 inch for use in compact cordless drills.