Cleveland C54512 Hand Tap 5/16-18 Unc Plug Hss

Product Description

The CLEVELAND C54512 is a 5/16-18 UNC plug-chamfer hand tap made from high speed steel with a bright uncoated finish. It is a 4-flute, straight-flute design built for cutting internal threads in a wide range of metal workpieces. The tap measures 2.719 inches overall length with a 0.69-inch thread length and is ground to a Class 2B fit with an H5 thread limit. It is used by machinists, tool-and-die workers, and maintenance tradespeople for hand-tapping operations in both blind and through-hole applications. The right-hand thread direction and plug chamfer make it a standard choice for production and repair threading work.

This tap is suited for both blind hole threading and through-hole threading in a shop or field maintenance setting. It performs in alloy steel, carbon steel, aluminum, and free-machining stainless steel. The plug chamfer provides 3 to 5 chamfered threads, which guides the tap into a pre-drilled hole with moderate starting resistance — a practical balance between a taper and a bottoming tap. It is part of the CLEVELAND Series 1002 hand tap lineup and is packaged individually.

Key Features

• 5/16-18 UNC thread form, right-hand direction, Class 2B fit
• H5 thread limit for controlled tolerance threading
• 4-flute straight flute geometry for chip clearance and stability
• High speed steel construction for durability across common metal types
• Bright uncoated finish — no coating interference with close-tolerance work
• Suited for both blind hole and through-hole threading applications

Compatibility

Designed for hand-tapping operations in alloy steel, carbon steel, aluminum, and free-machining stainless steel workpieces requiring a 5/16-18 UNC internal thread. Part of the CLEVELAND Series 1002 standard hand tap series.

Installation Notes

This tap is installed by machinists or maintenance tradespeople using a standard tap wrench. Always pre-drill the correct tap drill size for 5/16-18 UNC before starting. Apply cutting oil appropriate for the workpiece material to reduce friction and extend tap life. Back the tap off periodically during threading to break chips, particularly in blind holes.