Osg 1727501 Spiral Point Tap 8-32 Unc 3 Flute Hss

Product Description

The OSG 1727501 is a spiral point plug tap designed for cutting 8-32 UNC internal threads in a wide range of ferrous materials. Built from vanadium high-speed steel (HSS-E) and finished with a steam oxide coating, this tap offers improved lubricity and resistance to built-up edge during cutting. The spiral point geometry pushes chips forward ahead of the tap, making it well suited for through-hole tapping applications. It carries a H4 thread limit and a 2B class of fit, producing threads that meet standard fastener assembly tolerances. Licensed machinists, toolroom technicians, and maintenance professionals are the typical users.

This tap is used in production and maintenance tapping operations on hardened steel, low-carbon steel, medium-carbon steel, and stainless steel workpieces. The plug chamfer makes it appropriate for through-hole applications where the tap can advance past the full thread depth. With a 0.381-inch thread length and an overall length of 2.126 inches, it fits standard tap holders and machines used in both shop and field settings.

Key Features

• Spiral point geometry pushes chips forward, reducing chip packing in through-hole applications
• Vanadium high-speed steel (HSS-E) construction for improved wear resistance in ferrous materials
• Steam oxide coating improves lubricity and reduces friction during cutting
• H4 thread limit with 2B class of fit for standard assembly tolerances
• Plug chamfer suitable for through-hole tapping
• Right-hand thread direction, 3-flute design

Compatibility

Designed for tapping 8-32 UNC through-holes in hardened steel, low-carbon steel, medium-carbon steel, and stainless steel. Compatible with standard 8-32 tap holders and tapping attachments. No coolant-through feature; use with external cutting fluid or tapping compound appropriate for the workpiece material.

Installation Notes

Installation and use should be performed by a qualified machinist or maintenance technician familiar with tapping operations. Always secure the workpiece and ensure the spindle or tap wrench is properly aligned before starting the cut to prevent tap breakage. Apply a suitable cutting fluid for the workpiece material, particularly when tapping stainless steel. Do not exceed the recommended speed range for the material being tapped, and back the tap out periodically to clear chips when working in deeper holes.