Drill America DEWCBRTS1-5/16 Counterbore 1-5/16" x 3/8" Pilot HSS Taper Shank

Drill America 1-5/16" Counterbore

This counterbore enlarges existing holes to a 1-5/16 inch diameter with a 3/8 inch pilot hole. It features two-piece construction with an integral taper shank and an interchangeable pilot for flexible use. The high-speed steel tool is suited for spot-facing shallow seats or deeper counterboring tasks. A California Proposition 65 warning applies to this product.

Machinists needing interchangeable pilots

The interchangeable pilot suits workshops that frequently change pilot sizes for different bolt clearances. Buyers who require a solid one-piece counterbore without removable components should look at alternative designs. The tool is not intended for primary hole drilling or for materials outside high-speed steel capability. Shops needing carbide-tipped cutting edges will need a different tool type.

1-5/16" diameter capacity

The cutter comfortably handles counterboring and spot-facing operations up to its 1-5/16 inch cutting diameter. It runs out when hole enlargement exceeds this size or when the 3/8 inch pilot does not match the pre-drilled hole. High-speed steel construction provides standard tool life for general-purpose machining but wears faster than carbide in abrasive alloys. The taper shank fits corresponding machine spindles directly.