Cleveland Controls C55118 Hand Tap 1/4-28 Unf Tin Hss

Product Description

The CLEVELAND CONTROLS C55118 is a 1/4-28 UNF straight-flute hand tap designed for cutting internal threads in both blind holes and through-holes. Built from high speed steel (HSS) with a titanium nitride (TiN) coating, it offers extended tool life and reduced friction during tapping operations. The plug chamfer (3-5 thread lead) makes it well suited for starting threads in pre-drilled holes where a bottoming tap is not required. With 4 flutes and a Class 3B H3 thread limit, this tap produces close-tolerance threads consistent with UNF standards. Overall length is 2.5 inches with a 1 inch thread length.

This tap is appropriate for job shop, maintenance, and production threading work where 1/4-28 UNF threads are required. It performs in alloy steel, carbon steel, aluminum, and free-machining stainless steel. The TiN coating makes it a practical choice when tapping abrasive or work-hardening materials where uncoated HSS taps wear prematurely. Machinists, tool-and-die makers, and maintenance technicians regularly use this style of tap for manual or low-speed machine tapping applications.

Key Features

• TiN coating reduces friction and extends tool life compared to uncoated HSS taps
• Plug chamfer provides reliable thread start in blind or through-hole applications
• Class 3B fit with H3 thread limit for close-tolerance UNF thread production
• 4-flute straight-flute design compatible with manual and machine tapping
• Compatible with alloy steel, carbon steel, aluminum, and free-machining stainless steel
• Right-hand thread direction; no coolant-through feature

Compatibility

Designed for cutting 1/4-28 UNF right-hand internal threads; compatible with alloy steel, carbon steel, aluminum, and free-machining stainless steel workpieces in blind-hole and through-hole threading applications.

Installation Notes

This tap is installed by machinists or maintenance technicians using a tap wrench or tapping attachment. Always ensure the workpiece is securely fixtured and the pilot hole diameter matches the recommended tap drill size for 1/4-28 UNF before beginning. Use an appropriate cutting fluid for the workpiece material to reduce heat and extend tap life. Reverse the tap periodically during manual tapping to break chips and prevent binding.