Cleveland C57140 Spiral Point Tap 1/4-28 Unf 2 Flute

Product Description

The CLEVELAND C57140 is a spiral point tap designed for bottoming applications in 1/4-28 UNF threaded holes. Made from high speed steel with a bright finish, this tap is built for right-hand threading in blind holes where full thread depth close to the bottom is required. It features 2 flutes, a H3 thread limit, and a 3B class of fit, making it suitable for close-tolerance work in production and maintenance environments. Licensed machinists, HVAC fabricators, and plumbing tradespeople use this tap when threading smaller fastener holes in metal components and fixtures.

This tap is rated for use in aluminum, copper alloys, low carbon steel, and magnesium. Its 0.63 inch thread length and 0.39 inch neck length allow access into blind holes without excessive overhang. The 2.5 inch overall length provides enough shank to seat securely in a tap handle or machine spindle. It is well suited for field repair work, sheet metal fabrication, and light production threading where a 1/4-28 UNF thread form is required.

Key Features

• Bottoming chamfer design allows threading close to the bottom of blind holes
• High speed steel construction provides durability across a range of workpiece materials
• H3 thread limit and 3B class of fit for close-tolerance thread production
• Bright finish with no coolant-through requirement suits hand tapping and low-speed machine use
• Right-hand thread direction, 1/4-28 UNF form, compatible with standard 1/4-28 fasteners
• 2 flutes support chip clearance in short threading applications

Compatibility

Designed for cutting 1/4-28 UNF right-hand threads in blind holes through aluminum, copper alloys, low carbon steel, and magnesium workpieces. Part of the Cleveland Series 1012 tap line.

Installation Notes

This tap should be installed in a properly sized tap handle or machine spindle before use. Always ensure the workpiece is secured and the correct tap drill size for a 1/4-28 UNF thread has been used prior to tapping. Apply appropriate cutting fluid for the workpiece material to extend tool life and improve thread quality. Do not force the tap if resistance increases sharply, as this may indicate a chip jam or contact with the hole bottom.