Cleveland C57011 Spiral Point Tap 0-80 Unf Hss

Product Description

The CLEVELAND C57011 is a spiral point tap designed for through-hole threading in metal workpieces. It cuts a 0-80 UNF thread with 2 flutes and a plug chamfer, making it well suited for starting taps in pre-drilled holes and driving chips ahead of the cutting edge during the pass. The tap is manufactured from high-speed steel with a bright, uncoated finish and carries an H2 thread limit for close tolerance work. Overall length is 1.688 inches with a thread length of 0.310 inches. This tap is used by machinists, tool and die makers, and maintenance technicians working with small-diameter fastener threads in production or repair settings.

The C57011 is rated for threading in alloy steel, aluminum, and carbon steel. The plug chamfer configuration requires a pre-existing through-hole and is the standard choice for production through-hole tapping where chip ejection forward is acceptable. The 2B class of fit delivers a standard commercial thread tolerance, pairing with 2A externally threaded fasteners. With a shank diameter of 0.141 inches and a square drive size of 2.79 mm, it is sized for use in standard tap handles or tapping chucks appropriate for 0-series taps.

Key Features

• 0-80 UNF spiral point design pushes chips ahead of the tap for clean through-hole threading
• High-speed steel construction provides durability across alloy steel, aluminum, and carbon steel applications
• Plug chamfer for use in through-holes where a starting taper is not required
• H2 thread limit for consistent 2B class of fit tolerancing
• Bright, uncoated finish allows visual inspection of cutting edges during use
• Right-hand thread direction, compatible with standard tapping equipment

Compatibility

Designed for through-hole tapping applications in alloy steel, aluminum, and carbon steel. Compatible with standard tap handles and tapping chucks sized for 0-series taps with a 0.141-inch shank diameter. Part of CLEVELAND Series 1011.

Installation Notes

Machinist or toolroom personnel should ensure the workpiece is securely fixtured before tapping. The pre-drilled hole must be sized to the correct tap drill diameter for a 0-80 UNF thread before the tap is engaged. Apply an appropriate cutting fluid for the workpiece material to reduce heat and extend tap life. Never reverse a spiral point tap under power without confirming the drive setup supports it, as breakage in small-diameter taps is common when back-torque is applied abruptly.