Osg 1730301 Spiral Point Tap 8-32 Unc 3 Flute Hss

Product Description

The OSG 1730301 is a spiral point tap designed for cutting internal threads in a wide range of ferrous metals. It carries an 8-32 UNC thread form with a plug chamfer, 3 flutes, and a 2B class of fit. The tap is manufactured from vanadium high-speed steel (HSS-E) and finished with a steam oxide coating that reduces friction and helps resist galling during threading operations. The H3 thread limit provides a controlled fit tolerance suitable for standard fastener assembly. Overall length is 2.126 inches with a thread length of 0.381 inches and a shank diameter of 0.168 inches.

This tap is suited for threading operations in hardened steel, low-carbon steel, medium-carbon steel, and stainless steel. Typical applications include production machining, MRO repair work, and fabrication environments where reliable 8-32 UNC thread quality is required. Right-hand thread direction makes it compatible with standard tapping chucks and hand tap wrenches. It is used in both manual and machine tapping setups where coolant-through tooling is not required.

Key Features

• 8-32 UNC thread form with 2B class of fit for standard fastener compatibility
• Plug chamfer (4-5 thread lead) allows starting in through-holes or deeper blind holes
• Vanadium HSS-E construction provides increased wear resistance over standard M2 HSS
• Steam oxide finish reduces friction and improves chip flow during cutting
• H3 thread limit for consistent, controlled fit tolerance
• Right-hand spiral point pushes chips ahead of the tap, keeping flutes clear in through-hole applications

Compatibility

Designed for threading 8-32 UNC right-hand internal threads in hardened steel, low-carbon steel, medium-carbon steel, and stainless steel workpieces. Not intended for coolant-through tapping setups.

Installation Notes

This tap is installed and driven by a machinist or tooling technician using a standard tapping chuck, CNC tapping attachment, or hand tap wrench. Ensure the workpiece is secured and the pilot hole is drilled to the correct tap drill diameter for 8-32 UNC before threading begins. Apply appropriate cutting fluid for the workpiece material, particularly when tapping stainless steel. Do not force the tap past resistance, as breakage in hardened materials can occur if feed rate or alignment is off.