Osg 1727701 Spiral Point Tap 8-36 Unc 3 Flute Plug

Product Description

The OSG 1727701 is a spiral point plug tap designed for cutting 8-36 UNC internal threads in a range of ferrous materials. Manufactured from vanadium high-speed steel (HSS-E) with a steam oxide coating, this tap offers improved lubricity and corrosion resistance during threading operations. It features 3 flutes and a plug chamfer, which eases entry into through-hole applications by distributing cutting load across several leading threads. The H2 thread limit holds tight tolerance control on the finished thread form. With an overall length of 2.126 inches and a thread length of 0.374 inches, this tap is suited for short-reach threading in production and maintenance environments. Licensed machinists and toolroom technicians are the primary installers.

This tap is intended for use in through-hole threading applications on hardened steel, low-carbon steel, medium-carbon steel, and stainless steel workpieces. The spiral point design pushes chips forward ahead of the cutting zone, making it well suited for machine tapping on CNC machining centers, drill presses, or tapping arms where chip evacuation ahead of the tap is practical. It is a common choice for production threading of small-diameter fastener holes in fabrication, repair, and assembly operations.

Key Features

• 8-36 UNC thread form with H2 thread limit for consistent tolerance control
• Vanadium high-speed steel (HSS-E) construction for durability in ferrous materials
• Steam oxide coating improves lubricity and reduces galling during threading
• Plug chamfer distributes cutting load for smooth entry in through-hole applications
• Spiral point geometry pushes chips forward, reducing clogging in machine tapping
• Right-hand thread direction, 3-flute design, non-coolant-through construction

Compatibility

Rated for use in hardened steel, low-carbon steel, medium-carbon steel, and stainless steel. Designed for through-hole machine tapping applications requiring an 8-36 UNC thread form with a 2B class of fit.

Installation Notes

This tap should be installed in a properly aligned tap holder or floating tapper to prevent cross-threading and breakage. Always apply cutting fluid appropriate for the workpiece material before and during tapping. Ensure the spindle speed and feed rate match the tap manufacturer recommendations for the material being threaded. Inspect the tap for chipping or wear before each use, as a damaged tap can destroy the workpiece thread.