Osg 2830000 Spiral Point Tap 1/4-20 Unc 3 Flute Hss

Product Description

The OSG 2830000 is a spiral point tap designed to cut internal 1/4-20 UNC threads in through-hole applications. Built from Vanadium High Speed Steel (HSS-E), this tap delivers consistent thread formation across a wide range of ferrous and non-ferrous materials. The spiral point geometry pushes chips forward ahead of the cutting action, keeping the flutes clear and reducing the risk of tap breakage in production environments. With a plug chamfer, H3 thread limit, and 3B class of fit, the 2830000 is suited for threading operations where standard tolerance and clean chip evacuation are priorities. Qualified machinists, tool and die workers, and maintenance technicians are the typical installers.

This tap is used in general machining, fabrication, and maintenance-repair-overhaul (MRO) operations wherever 1/4-20 UNC through-holes are required. The plug chamfer makes it well suited for starting threads in pre-drilled holes where partial thread engagement at entry is acceptable. Compatible material applications include aluminum, hardened steel, stainless steel, high-carbon steel, low-carbon steel, medium-carbon steel, alloy steel, die steel, and cast iron. It is not rated for coolant-through use and does not produce an interrupted thread profile.

Key Features

• Spiral point design pushes chips forward for cleaner through-hole threading
• Vanadium High Speed Steel (HSS-E) construction for broad material compatibility
• Plug chamfer for standard through-hole entry and thread starting
• H3 thread limit and 3B class of fit for consistent, standard-tolerance threads
• Bright finish with no coating — suitable for use with cutting fluid or oil
• Right-hand thread direction, no coolant-through requirement

Compatibility

Designed as a standard 1/4-20 UNC spiral point plug tap for through-hole threading in aluminum, hardened steel, stainless steel, high-carbon steel, low-carbon steel, medium-carbon steel, alloy steel, die steel, and cast iron.

Installation Notes

This tap is installed by qualified machinists or maintenance technicians using a tap wrench, tapping head, or CNC machine spindle with appropriate tap holder. Always drill the correct tap drill size for 1/4-20 UNC before tapping, and ensure the workpiece is securely fixtured. Apply a suitable cutting fluid or tapping oil to extend tool life and improve thread quality. Do not reverse the tap under power without confirming the machine setup supports it, and inspect the tap for wear or chipping before each use.