Osg 1733401 Spiral Flute Tap 1/2-13 Unc 3B Vanadium Hss

Product Description

The OSG 1733401 is a spiral flute tap designed for threading 1/2-13 UNC holes in ferrous materials. It is manufactured from vanadium high-speed steel and finished with a steam oxide coating that provides corrosion resistance and reduces galling during threading. The modified bottoming chamfer allows the tap to thread close to the bottom of a blind hole, making it well suited for applications where full thread depth near the bottom is required. The 45-degree helix angle helps evacuate chips efficiently, reducing the risk of chip packing. It carries a 3B class of fit and an H3 thread limit for reliable, standardized tolerance control. Machinists and toolroom technicians are the primary users of this tap.

This tap is rated for use in stainless steel, high-carbon steel, low-carbon steel, and medium-carbon steel. It is a right-hand tap with right-hand flutes, suitable for CNC machining centers, drill presses, and manual tapping operations. The modified bottoming chamfer makes it a practical choice for blind-hole work in general machining, maintenance, and fabrication environments. It belongs to OSG Series 303 and is sold individually.

Key Features

• Vanadium high-speed steel construction for wear resistance in ferrous materials
• Steam oxide coating reduces friction and galling during thread cutting
• 45-degree helix angle promotes upward chip evacuation in blind holes
• Modified bottoming chamfer allows threading close to the bottom of a blind hole
• H3 thread limit with 3B class of fit for consistent, standardized tolerance output
• Right-hand thread and right-hand flute direction for conventional tapping setups

Compatibility

Designed for cutting 1/2-13 UNC threads in stainless steel, high-carbon steel, low-carbon steel, and medium-carbon steel workpieces. Suitable for use in any tapping setup that accepts a standard shank tap with a 0.367 inch shank diameter.

Installation Notes

Tapping operations should be performed by a qualified machinist following shop safety procedures. Ensure the workpiece is securely fixtured and the spindle or tap driver is properly aligned before beginning the cut. Apply an appropriate cutting fluid for the workpiece material to extend tool life and improve thread quality. Do not reverse or back the tap out under power without confirming the machine setup supports synchronized reversing.