Osg 1759901 Spiral Point Tap 8-32 Unc Plug 3 Flute

Product Description

The OSG 1759901 is a spiral point tap designed for threading 8-32 UNC right-hand internal threads in challenging materials. Built from powdered metal and finished with a steam oxide coating, this plug-chamfer tap is engineered for controlled chip evacuation in through-hole applications. The spiral point geometry pushes chips forward ahead of the tap, reducing clogging and heat buildup during cutting. With an H4 thread limit, it holds tight tolerances suitable for precision fastener applications. At 2.126 inches overall length and a 0.168-inch shank diameter, it fits standard tap holders and chucks used in CNC and manual machining operations. Machinists and maintenance technicians install this tap across a wide range of ferrous and high-strength workpiece materials.

This tap is suited for through-hole tapping operations in residential and industrial maintenance, manufacturing, and repair environments. The 8-32 UNC thread form is a common fastener standard used in electronics enclosures, sheet metal fabrication, and light structural assemblies. The plug chamfer with 3 flutes makes it a general-purpose workhorse for moderate-depth through holes. It is installed dry or with appropriate cutting fluid depending on the workpiece material and shop practice. The 0.381-inch thread length provides sufficient contact for standard fastener engagement depths in this thread size.

Key Features

• Spiral point geometry pushes chips forward for clean through-hole tapping
• Powdered metal construction offers improved wear resistance over standard high-speed steel
• Steam oxide coating reduces friction and provides mild corrosion resistance during storage and use
• H4 thread limit for controlled tolerance fit on 8-32 UNC threads
• Plug chamfer allows easy starting in through-hole applications
• Right-hand cut, compatible with standard tap holders and CNC rigid tapping

Compatibility

Rated for use in hardened steel, stainless steel, high-nickel alloy, titanium, alloy steel, and die steel workpieces. Designed as an OEM-style cutting tool replacement for any application requiring 8-32 UNC right-hand spiral point tapping.

Installation Notes

This tap is installed by machinists and maintenance technicians using standard tap holders, T-handle wrenches, or CNC rigid tapping setups. Ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap drill diameter for 8-32 UNC before starting. Apply appropriate cutting fluid for the workpiece material, particularly when tapping stainless steel, titanium, or high-nickel alloys. Do not reverse the tap under load without backing off chip buildup to avoid breakage in harder materials.