Osg 1407000 Spiral Flute Tap 5-40 Unc Plug Hss

Product Description

The OSG 1407000 is a spiral flute tap designed to cut internal 5-40 UNC threads in a wide range of ferrous and non-ferrous materials. Built from high-speed steel with a bright uncoated finish, it features two right-hand flutes with a 50-degree helix angle that evacuates chips upward out of the hole during the threading operation. The plug chamfer configuration makes it suitable for through-hole tapping applications where the tap can advance freely past the bottom of the threaded zone. Class of fit is 2B/3B with an H2 thread limit, providing reliable dimensional control for standard fastener clearances. Installation is performed by licensed machinists or maintenance technicians working to UNC thread standards.

The OSG 1407000 is used in production and maintenance machining environments requiring small-diameter UNC threads. Its H2 thread limit and 2B/3B class of fit make it appropriate for standard tolerance fastener holes in materials including aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. The 50-degree helix angle promotes smooth chip flow, reducing the risk of tap breakage in blind or semi-through applications. This tap is well suited for manual tapping handles, drill press setups, and CNC tapping cycles.

Key Features

• 5-40 UNC thread form with H2 thread limit for consistent 2B/3B class of fit
• 50-degree right-hand spiral flute helix for efficient upward chip evacuation
• Plug chamfer for through-hole tapping applications
• High-speed steel construction for durability across ferrous and non-ferrous materials
• Bright uncoated finish; no coolant-through feature required for standard applications
• Compact overall length of 1.938 inches suits tight-clearance setups

Compatibility

Designed as an OEM-style replacement or direct-use spiral flute tap compatible with standard 5-40 UNC tapping applications in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel workpieces.

Installation Notes

This tap should be installed and operated by qualified machinists or maintenance technicians familiar with UNC thread standards. Always secure the workpiece and ensure the tap is properly aligned before beginning the threading cycle to prevent breakage. Power down or disengage any motorized drive before installing or removing the tap from a holder. Follow applicable ANSI B94.9 tap standards and shop safety procedures when selecting cutting speeds and lubricants for the workpiece material.