Irwin Tools 585-54009 9-piece bolt extractor set pneumatic accessory
- Drill Bits
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A high-speed steel counterbore with built-in pilot, 7.250 in long and .500 in diameter
The Cleveland C91723 counterbore is a high-speed steel cutting tool with a built-in pilot for accurate hole alignment. It measures 7.250 in overall length and .500 in diameter. Designed for fractional-inch work, it suits machinists and maintenance technicians who need reliable counterboring in metal.
The tool fits standard drill chucks and collets that accept a .500 in shank. Secure it firmly and run at speeds recommended for high-speed steel to avoid chatter. Common problems include premature wear if coolant is omitted, and pilot damage when the workpiece is not clamped rigidly.
Verify that your machine spindle or drill press can hold a .500 in shank and deliver appropriate RPM for high-speed steel. Confirm the workpiece material is compatible with uncoated HSS cutting edges. Ensure adequate clearance for the 7.250 in overall length in your setup.
Measured against everything we stock in Bits, Hole Saws & Accessory Kits, at today’s prices. Recalculated every night.
| Product | |
|---|---|
| Brand name | CLEVELAND |
After securing the 7.250 in tool in the chuck, run a test hole in scrap material; the 0.500 in high-speed steel pilot should guide the cutter without wobble and leave a flat-bottomed bore with no chatter marks.
The box contains the Cleveland C91723 counterbore with its built-in 0.500 in pilot; no separate pilot or arbor is required for standard fractional-inch drilling.
The C91723 is a single specification — 7.250 in overall length and 0.500 in diameter — so the only choice is this model when you need that exact fractional size.
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