Cleveland C54187 Hand Tap 5-40 Unc Bottoming Hss

Product Description

The CLEVELAND C54187 is a 5-40 UNC straight-flute hand tap designed for cutting internal threads in blind holes and through-holes. Manufactured from high speed steel with a bright uncoated finish, it delivers reliable thread cutting performance in a compact form suited to small-diameter work. The bottoming chamfer allows threading close to the bottom of a blind hole, making it the go-to choice when full thread depth is required. With a 2-flute straight-flute geometry and a right-hand thread direction, this tap is a standard production and repair tool used by machinists, maintenance technicians, and toolroom professionals.

This tap is sized for 5-40 UNC threads, a common fastener specification found in precision assemblies, instrumentation, electronics enclosures, and light mechanical hardware. It suits both blind hole and through-hole threading applications. The H2 thread limit holds tight tolerance for Class 2B and 3B thread fits, making it appropriate for general-purpose fastener applications where standard clearance is acceptable. It is used in manual tapping operations with a tap wrench or tapping handle on the bench or in the field.

Key Features

• Bottoming chamfer for threading to the bottom of blind holes
• High speed steel construction for durability across a range of workpiece materials
• Bright uncoated finish for general-purpose use without added coating friction
• H2 thread limit for Class 2B and 3B thread fit compliance
• 2-flute straight-flute design for straightforward manual tapping
• Right-hand thread direction, standard for most fastener applications

Compatibility

Compatible with alloy steel, aluminum, carbon steel, and free-machining stainless steel workpieces. Designed for use in blind hole and through-hole threading applications requiring a 5-40 UNC thread form.

Installation Notes

Install using a calibrated tap wrench sized to the square drive of this tap. Ensure the workpiece is securely fixtured before tapping to prevent tap breakage. Apply appropriate cutting fluid for the workpiece material to extend tap life and improve thread finish. Inspect the tap for wear or chipping before each use; a damaged tap can destroy a blind-hole workpiece that has no room for error.