Cleveland C54971 Hand Tap 1-1/8-12 Unf Taper 4-flute Hss

Product Description

The CLEVELAND C54971 is a 1-1/8-12 UNF straight flute hand tap designed for cutting internal threads in metalworking applications. Manufactured from high speed steel with a bright uncoated finish, this tap features a taper chamfer and 4-flute geometry that guides the tool into the workpiece and clears chips during threading. The right-hand thread direction, Class 3B fit, and H4 thread limit make it suitable for precision threading work in production and maintenance environments. Overall length is 5.438 inches with a thread length of 2.56 inches and a shank diameter of 0.896 inches. Machinists, toolroom technicians, and maintenance mechanics install this tap by hand or with a tap wrench.

This tap handles both blind hole and through-hole threading operations across a range of ferrous and non-ferrous materials. It is well suited for use in alloy steel, carbon steel, aluminum, and free-machining stainless steel workpieces. The 1-1/8-12 UNF thread size is common in industrial fastener and hydraulic fitting applications where fine-thread engagement is required. The taper chamfer — typically 8 to 10 threads of lead — helps with starting alignment in manual tapping operations.

Key Features

• 1-1/8-12 UNF thread form with Class 3B fit and H4 thread limit for precision tolerance control
• Taper chamfer for easy thread starting in blind and through-hole applications
• 4-flute straight flute design suits short-chipping materials including aluminum, carbon steel, and alloy steel
• High speed steel construction provides hardness and wear resistance for general-purpose threading
• Bright uncoated finish — no coating variables to account for in application setup
• Right-hand thread direction; compatible with standard tap wrench and machine tap holder drives

Compatibility

Designed for use in blind hole and through-hole threading of alloy steel, aluminum, carbon steel, and free-machining stainless steel. Fits standard tap wrench drivers sized for a 0.896-inch shank diameter and a 0.672-inch square drive.

Installation Notes

A licensed machinist or qualified maintenance mechanic should perform all tapping operations. Secure the workpiece fully before starting; use cutting fluid appropriate to the workpiece material to extend tap life and improve thread quality. Apply steady, even torque — reverse the tap periodically to break chips when working in blind holes. Never force a tap against an obstruction; doing so risks tap breakage and workpiece damage.