Osg 1067200 Straight Flute Tap 5-40 Unc Plug Hss

Product Description

The OSG 1067200 is a straight flute tap designed for cutting internal threads to the 5-40 UNC standard. Built from high-speed steel (HSS) with a bright, uncoated finish, it features a plug chamfer and two flutes suited for through-hole and shallow blind-hole tapping applications. The overall length is 1-15/16 inches with a thread length of 5/8 inches and a shank diameter of 0.141 inches. The H2 thread limit and Class 2B/3B fit make this tap appropriate for standard-tolerance threaded fastener applications in machining and fabrication environments. It is installed by machinists, tool-and-die makers, and maintenance technicians.

This tap is intended for use in materials including aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel. The plug chamfer style makes it well suited for tapping through holes or starting threads in blind holes with adequate chip clearance. It is a common selection for small-diameter threaded hole production on manual mills, drill presses, and CNC equipment in light manufacturing and maintenance-repair-operations (MRO) settings.

Key Features

• 5-40 UNC thread form with right-hand thread direction
• Plug chamfer for versatile through-hole and blind-hole use
• High-speed steel construction for durability across a range of workpiece materials
• H2 thread limit for consistent Class 2B and 3B fit tolerances
• Two-flute design promotes chip evacuation in short-chipping materials
• Bright, uncoated finish with no coolant-through requirement

Compatibility

Designed for tapping 5-40 UNC threaded holes in aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel workpieces where a Class 2B or 3B fit is required.

Installation Notes

This tap is installed by machinists or maintenance technicians using a tap wrench, tapping head, or machine spindle. Use appropriate cutting fluid or tapping compound for the workpiece material to extend tool life and improve thread finish. Ensure the tap is started square to the hole to avoid thread damage or tool breakage. For blind-hole applications, confirm adequate chip clearance depth before tapping to prevent tap breakage from chip packing.