Cleveland C57051 Spiral Point Tap 4-48 Unf Hss

Product Description

The CLEVELAND C57051 is a spiral point tap designed for right-hand through-hole threading in a 4-48 UNF thread form. Built from high speed steel with a bright finish, it features a plug chamfer and 2 flutes, producing clean threads by pushing chips forward through the hole rather than packing them in the flute. The H2 thread limit and Class 2B fit designation make it a standard choice for general-purpose internal threading applications where moderate tolerance is required. Overall length is 1.875 inches with a thread length of 0.310 inches and a shank diameter of 0.141 inches. Licensed machinists, tool and die makers, and maintenance technicians install this tap using a standard tap wrench or machine spindle.

This tap is suited for through-hole applications in alloy steel, carbon steel, and aluminum workpieces. The 4-48 UNF designation places it in fine-pitch territory, commonly found in small fastener applications in precision assemblies, electronic enclosures, and instrument hardware. The spiral point geometry is well matched to CNC tapping and manual machine use where chip evacuation ahead of the cutting edge is essential for clean thread formation and tool longevity.

Key Features

• Spiral point geometry pushes chips forward for clean through-hole threading
• High speed steel construction provides hardness and wear resistance across a range of workpiece materials
• Plug chamfer with 2 flutes balances cutting action and chip clearance
• H2 thread limit with Class 2B fit for general-purpose tolerance requirements
• Bright finish with no coating for straightforward inspection and resharpening
• Right-hand thread direction, compatible with standard tap handles and CNC spindles

Compatibility

Designed for through-hole threading in alloy steel, aluminum, and carbon steel workpieces requiring a 4-48 UNF internal thread. Fits standard tap handles and machine spindles accepting a 0.141-inch shank diameter.

Installation Notes

This tap is installed by machinists or maintenance professionals using a tap wrench, tapping head, or CNC rigid tapping cycle. Always use appropriate cutting fluid for the workpiece material to extend tool life and improve thread quality. Ensure the workpiece is properly secured and the tap is started perpendicular to the hole to avoid thread distortion or tap breakage. Spiral point taps require a through hole with adequate clearance beyond the full thread depth.