Value Collection JY4862181 Straight Flute Tap 1-1/8-18 Unef

Product Description

The VALUE COLLECTION JY4862181 is a straight flute bottoming tap designed for cutting internal threads in through-holes and blind holes where threads must extend close to the bottom. Manufactured from high-speed steel with a bright, uncoated finish, this tap cuts a 1-1/8-18 UNEF right-hand thread to a 3B class of fit with an H4 thread limit. The 6-flute configuration provides additional cutting edges for improved finish and dimensional consistency in ferrous and non-ferrous workpiece materials. Overall length is 4 inches. This tap is suited for use in manual tapping, drill press, and CNC tapping operations performed by machinists, tool-and-die makers, and maintenance professionals.

This bottoming tap is intended for applications where a plug or taper tap has already been used to start the thread, or wherever the full thread depth must reach the bottom of a blind hole. The 1-1/8-18 UNEF thread form is commonly used in precision mechanical assemblies, hydraulic fittings, and aerospace or industrial equipment requiring fine-pitch threads in larger-diameter fastener locations. Suitable for use in both production and job-shop environments on steel, aluminum, brass, and similar machinable materials.

Key Features

• Bottoming chamfer allows threading to the base of blind holes
• 6 flutes provide additional cutting edges for improved thread finish and accuracy
• High-speed steel construction offers durability across a wide range of workpiece materials
• Bright, uncoated finish allows easy inspection of tool condition and wear
• H4 thread limit and 3B class of fit ensure proper dimensional tolerance for standard assemblies
• Right-hand thread direction matches the most common fastener orientation

Compatibility

Designed as a standard replacement or stock tap for any application requiring a 1-1/8-18 UNEF bottoming tap with a 3B class of fit and H4 thread limit.

Installation Notes

This tap should be installed in a tap wrench, tapping head, or CNC spindle rated for the tap size and workpiece material. Always apply a suitable cutting fluid to reduce heat and extend tool life. Power down or disengage the spindle before loading or removing the tap. Do not force the tap against the bottom of a blind hole, as this can cause breakage or thread damage.