Osg 1727401 Spiral Point Tap 6-40 Unc Plug 2B Hss

Product Description

The OSG 1727401 is a spiral point tap designed for machine tapping operations in a wide range of ferrous materials. It cuts a 6-40 UNC thread profile with a plug chamfer, which provides a gradual lead-in and is suited for through-hole applications. Manufactured from vanadium high speed steel and finished with a steam oxide coating, the 1727401 resists wear and reduces friction during the tapping cycle. With a 2B class of fit and H3 thread limit, it produces threads within standard tolerance for general mechanical assemblies. Overall length is 2 inches, thread length is 0.37 inches, and shank diameter is 0.141 inches.

This tap is used in production and maintenance machining environments where 6-40 UNC threads are required in through-hole configurations. Suitable material applications include hardened steel, low-carbon steel, medium-carbon steel, and stainless steel. It is appropriate for use in CNC machining centers, drill presses, and manual tapping setups where consistent thread quality and right-hand thread direction are required. Machinists, tool and die makers, and maintenance technicians working in industrial or MRO settings are the primary users of this tool.

Key Features

• 6-40 UNC thread form with plug chamfer for through-hole tapping
• Vanadium high speed steel construction for wear resistance in ferrous materials
• Steam oxide coating reduces friction and improves chip flow
• 2B class of fit with H3 thread limit for standard mechanical assembly tolerances
• Right-hand thread direction, no coolant-through requirement
• OSG Series 300 design with 0.141-inch shank diameter

Compatibility

Designed for through-hole tapping in hardened steel, low-carbon steel, medium-carbon steel, and stainless steel. Produces 6-40 UNC right-hand threads conforming to 2B tolerance class.

Installation Notes

This tap is installed by machinists and tool operators in machine tapping or hand tapping setups. Ensure the workpiece is securely clamped and the tap is properly aligned with the pre-drilled hole before beginning the tapping cycle. Use an appropriate tapping fluid or cutting oil for the workpiece material to extend tool life and improve thread quality. Do not force the tap if resistance increases unexpectedly, as this may indicate chip buildup or improper alignment.