Osg 1207000 Spiral Point Tap 5-40 Unc 2 Flute Hss

Product Description

The OSG 1207000 is a spiral point tap designed to cut 5-40 UNC threads in through-hole applications. It features a 2-flute, plug chamfer geometry that pushes chips ahead of the cutting edge, keeping the flutes clear during production tapping. Built from high-speed steel with a bright finish, this tap handles a wide range of workpiece materials including aluminum, cast iron, and both low- and high-carbon steel. The H2 thread limit designation indicates a tight tolerance grind suitable for 2B and 3B class-of-fit threads. Overall length is 1.938 inches with a thread length of 0.625 inches and a shank diameter of 0.141 inches.

This tap is suited for light to medium production work in job shops, maintenance environments, and precision manufacturing where 5-40 UNC fastener holes are required. The plug chamfer makes it the standard choice for through-hole tapping in materials ranging from cast aluminum to medium-carbon steel. It belongs to OSG Series 105 and is sold individually, making it practical for both toolroom stocking and single-job procurement.

Key Features

• Spiral point geometry pushes chips forward, preventing re-cutting in through-hole applications
• H2 thread limit grind produces consistent 2B and 3B class-of-fit threads
• High-speed steel construction handles aluminum, cast iron, low-, medium-, and high-carbon steel
• Plug chamfer provides smooth thread lead-in for through-hole work
• Bright finish with no coating keeps cost low for general-purpose use
• Right-hand thread direction, no coolant-through feature

Compatibility

Designed for cutting 5-40 UNC threads in through-hole applications across aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel workpieces per the material application data provided.

Installation Notes

This tap should be installed in a machine tap holder or used with a tapping head that provides proper axial float to prevent thread distortion. Ensure the spindle is fully stopped and power is locked out before changing taps in any machine tool. Use a compatible tapping fluid or cutting oil for the workpiece material to extend tap life and maintain thread quality. Follow shop practices and applicable OSHA machine guarding standards during setup and operation.