Cleveland C54885 Hand Tap 7/8-9 Unc Plug 4-flute Hss

Product Description

The CLEVELAND C54885 is a 7/8-9 UNC straight-flute hand tap designed for cutting internal threads in both blind holes and through-holes. Made from high speed steel with a bright uncoated finish, it delivers reliable thread-cutting performance across a range of ferrous and non-ferrous materials. The plug chamfer style — with a moderate lead — makes it suited for starting threads in a pre-drilled hole without requiring a dedicated taper tap first. With four flutes and a Class 3B, H4 thread limit, it produces close-tolerance threads appropriate for precision assembly work in alloy steel, carbon steel, aluminum, and free-machining stainless steel applications.

This tap is intended for hand tapping operations performed by machinists, maintenance technicians, and tool-and-die tradespeople. It handles both blind hole and through-hole threading in general metalworking, fabrication, and repair scenarios. The 7/8-9 UNC thread form is a common fastener size across structural, mechanical, and industrial applications, making this tap a regular fixture in job shops, maintenance departments, and field repair kits where standard unified coarse threads are specified.

Key Features

• 7/8-9 UNC thread form with Class 3B fit and H4 thread limit for tight-tolerance threading
• Plug chamfer provides a moderate lead, suitable for starting threads in blind or through-holes
• Four straight flutes for chip clearance and consistent thread form
• High speed steel construction handles alloy steel, carbon steel, aluminum, and free-machining stainless steel
• Bright uncoated finish — no coating buildup to alter tap geometry over repeated use
• Right-hand thread direction, compatible with standard tap wrenches and tapping fixtures

Compatibility

Designed for use in blind hole and through-hole threading operations requiring a 7/8-9 UNC thread form. Compatible with alloy steel, aluminum, carbon steel, and free-machining stainless steel workpieces. Part of the CLEVELAND Series 1002 standard tap line.

Installation Notes

Machinists and metalworking technicians should ensure the pilot hole is drilled to the correct tap drill diameter for 7/8-9 UNC before use. Secure the workpiece firmly before tapping and apply appropriate cutting fluid to extend tap life and improve thread quality. Use a calibrated tap wrench or tapping fixture to maintain axial alignment and avoid tap breakage. Back the tap off periodically during hand tapping to break and clear chips, particularly in blind hole applications.