Cleveland C54188 Hand Tap 5-40 Unc Taper Rh Hss

Product Description

The CLEVELAND C54188 is a 5-40 UNC straight-flute hand tap designed for cutting internal threads in a range of ferrous and non-ferrous workpiece materials. Built from high speed steel with a bright uncoated finish, this tap operates in right-hand thread direction and carries a taper chamfer, which guides the tool into the hole and distributes cutting load across several leading threads. The H2 thread limit keeps tolerances tight for 2B and 3B class-of-fit thread production. Overall length is 1.938 inches, with a thread length of 0.31 inches. Three straight flutes provide chip clearance and suit most standard hand-tapping operations.

This tap is suited for blind-hole and through-hole threading applications across machine shops, maintenance facilities, and production environments. It is rated for use in alloy steel, carbon steel, aluminum, and free-machining stainless steel. The 5-40 UNC designation makes it a common choice for small fastener threading in instrument housings, electrical enclosures, and light mechanical assemblies. It is typically used by machinists, tool-and-die technicians, and maintenance mechanics working in shop or field settings.

Key Features

• 5-40 UNC thread form for small-diameter inch-series internal threading
• Taper chamfer distributes cutting load and aids thread entry in both blind and through holes
• High speed steel construction provides durability across a range of workpiece materials
• Bright uncoated finish suits general-purpose use without added coating cost
• H2 thread limit maintains consistent 2B and 3B class-of-fit tolerances
• 3-flute straight-flute geometry offers chip clearance for standard hand-tapping operations

Compatibility

Designed for blind-hole and through-hole threading in alloy steel, carbon steel, aluminum, and free-machining stainless steel workpieces requiring 5-40 UNC internal threads to 2B or 3B class-of-fit standards.

Installation Notes

This tap is installed by machinists or maintenance mechanics using a standard tap wrench or tap handle. Before tapping, ensure the drilled hole matches the correct tap-drill diameter for 5-40 UNC thread engagement. Apply appropriate cutting fluid for the workpiece material to reduce friction and extend tool life. Do not force the tap if resistance increases sharply, as breakage in small-diameter taps is difficult to recover from.