Cleveland
Cleveland C91699 Counterbore #10 3.500" L .313" dia. Bright
A #10 high-speed steel counterbore with built-in pilot, .313" diameter and 3.500" overall length
- #10 wire size fits standard clearance holes
- .313" pilot diameter guides the cutter precisely
- 500" overall length reaches deep counterbores
- High-speed steel construction resists wear in repeated use
- Bright finish reduces friction and resists corrosion
Cleveland C91699 Counterbore #10 3.500" L
The Cleveland C91699 is a high-speed steel counterbore with a built-in pilot designed for #10 wire size holes. It serves machinists and maintenance technicians who need to create precise flat-bottom recesses for fastener heads in metalwork. The bright finish identifies the standard uncoated tool surface. This accessory fits standard tool holders for drilling and milling operations.
Sustained cutting in high-speed steel
High-speed steel construction maintains hardness at the elevated temperatures generated during extended counterboring cycles. The built-in pilot guides the cutter to keep the bore concentric with the existing hole throughout the cut. This design reduces wander when the tool engages fully across the workpiece thickness. Consistent feed rates preserve edge life during repetitive use in production environments.
Limits of the #10 wire standard
The #10 wire gauge defines the pilot diameter at .313 inches, which fixes the minimum pre-drilled hole size this counterbore can follow. The 3.500 inch overall length sets the maximum reach from the tool holder face to the bottom of the recess. Builders needing larger clearance holes or deeper counterbores must select a different wire size or longer tool. The standard geometry does not accommodate stepped or tapered fastener seats.
Highlights
- #10 wire size fits standard clearance holes
- .313" pilot diameter guides the cutter precisely
- 500" overall length reaches deep counterbores
- High-speed steel construction resists wear in repeated use
- Bright finish reduces friction and resists corrosion
Specifications
| Brand | CLEVELAND |
|---|
Questions about this item
Does the .313" diameter counterbore generate noticeable heat when run continuously in a drill press?
The high-speed steel construction handles normal drilling heat; use cutting fluid for extended sessions to keep temperatures low.
What shank size must my drill chuck accept to hold the C91699 counterbore?
The tool is a #10 wire-size counterbore with a .313" pilot; ensure your chuck grips that diameter securely.
Will the 3.500" overall length counterbore reach deep holes on an older benchtop drill press?
At 3.500" long it clears most standard workpieces; verify your press spindle travel exceeds the hole depth you need.
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