Drill America
Drill America DEWCBRTS1-5/16 Counterbore 1-5/16" x 3/8" Pilot HSS Taper Shank
A high-speed steel counterbore with a 3/8-inch interchangeable pilot for enlarging existing holes to a precise depth
- Enlarges existing holes for bolt heads
- Two-piece design allows pilot interchangeability
- High-speed steel construction resists wear
- Taper shank fits compatible machine spindles
- California Prop 65 chemical warning applies
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.
Highlights
- Enlarges existing holes for bolt heads
- Two-piece design allows pilot interchangeability
- High-speed steel construction resists wear
- Taper shank fits compatible machine spindles
- California Prop 65 chemical warning applies
Specifications
| Brand | DRILL AMERICA |
|---|
Questions about this item
What taper-shank tool holder do I need for the 1-5/16" counterbore?
Use a machine spindle or drill-press sleeve that matches the tool's taper-shank size so the counterbore seats securely.
Can I keep my existing 3/8" pilot when switching to this larger counterbore?
The pilot is interchangeable; you can swap to the 3/8" pilot included with this counterbore or use another compatible pilot size.
How do I verify the counterbore is cutting correctly after setup?
Check that the enlarged hole is concentric, flat-bottomed and matches the intended depth for the bolt head or nut seat.
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