Regal Cutting Tools 015144AS Extension Tap 1/2-13 Hss

Product Description

The REGAL CUTTING TOOLS 015144AS is a spiral point plug extension tap designed for right-hand tapping of 1/2-13 UNC threads. Built from high-speed steel with a bright uncoated finish, it delivers consistent thread cutting performance in a wide range of metals. The H3 thread limit provides reliable fit for 3B class tolerances. At 6 inches overall length with a 1-21/32 inch thread length, this tap reaches deeper into workpieces than standard-length taps, making it well suited for blind holes and deep-clearance applications. It carries 3 flutes and a plug chamfer for lead-in stability. Machinists, tool-and-die technicians, and maintenance professionals install this tap in manual tap handles or machine spindles.

This extension tap is used in production machining, maintenance and repair operations, and fabrication environments where 1/2-13 UNC internal threads are required. The spiral point geometry pushes chips ahead of the cutting edges, making it effective in through-hole applications. Compatible material applications include alloy steel, low-carbon steel, medium-carbon steel, high-carbon steel, free-machining steel, stainless steel, precipitation-hardened stainless steel, cast iron, nickel alloy, wrought aluminum, cast aluminum, and die cast aluminum. The reduced shank allows passage through close-clearance fixtures and guides.

Key Features

• Spiral point geometry pushes chips forward for clean through-hole tapping
• Plug chamfer provides controlled lead-in on starting threads
• H3 thread limit produces 3B class of fit for standard tolerance requirements
• Reduced shank at 0.367 inches diameter allows use in tight-clearance setups
• 6 inch overall length extends reach beyond standard tap lengths
• High-speed steel construction supports use across a broad range of ferrous and non-ferrous materials

Compatibility

Designed for cutting 1/2-13 UNC right-hand threads to a 3B class of fit in materials including alloy steel, carbon steel grades, stainless steel, cast iron, nickel alloy, and aluminum alloys. Fits standard tap handles and machine holders sized for a 0.367 inch shank diameter with a 0.275 inch square drive.

Installation Notes

Install and remove using a tap wrench or machine spindle rated for the shank diameter. Ensure the workpiece is securely fixtured before tapping. Apply cutting fluid appropriate for the workpiece material to extend tool life and improve thread finish. Inspect the tap for wear or chipping before each use and replace if cutting edges are damaged.