Cleveland C60752 Hand Tap 1/4-28 Lh Plug Hss Unf

Product Description

The CLEVELAND C60752 is a 1/4-28 left-hand plug chamfer hand tap ground from bright high speed steel. It is designed for cutting internal threads in through-holes where standard right-hand taps cannot be used. The 4-flute straight flute geometry produces clean, accurate threads to a 3B class of fit with an H3 thread limit, holding tight tolerances suitable for precision assemblies. With a 2.5-inch overall length and a 1-inch thread length, this tap is sized for general-purpose machine and fabrication work. Licensed machinists, tool-and-die makers, and maintenance technicians are the primary users.

This tap is suited for through-hole threading operations in a range of materials including steel, cast iron, stainless steel, aluminum, and other non-ferrous metals. The plug chamfer — 3 to 5 threads of lead — makes it appropriate for starting and finishing threads in through-holes where full thread engagement is needed from the start. It is commonly used in manual tapping operations on drill presses, mills, or by hand with a tap wrench in production and maintenance settings.

Key Features

• Left-hand thread direction for applications requiring reverse-thread fasteners or left-hand threaded components
• Plug chamfer provides 3 to 5 threads of lead for easy starting in through-holes
• 4-flute straight flute design for clean thread cutting in a wide range of metals
• Bright uncoated high speed steel construction — no coating to flake or delaminate during use
• H3 thread limit and 3B class of fit for precise, consistent thread geometry
• No coolant-through requirement — compatible with standard hand tapping and manual machine operations

Compatibility

Designed for through-hole threading of 1/4-28 UNF left-hand threads in steel, cast iron, stainless steel, aluminum, and non-ferrous metals. Compatible with standard tap wrenches and machine holders accepting a 0.255-inch shank diameter with a 5/16-inch square drive.

Installation Notes

This tap is installed by machinists and maintenance technicians using a tap wrench or appropriate machine holder. Always ensure the workpiece is securely clamped and the pilot hole is drilled to the correct tap drill size for a 1/4-28 UNF thread before tapping. Apply cutting fluid appropriate for the workpiece material to reduce heat and extend tap life. Never force a tap — back off periodically to break chips and prevent tap breakage, especially in stainless steel or other work-hardening alloys.