Osg 1736601 Spiral Point Tap 1/4-20 Unc 3 Flute

Product Description

The OSG 1736601 is a spiral point plug tap designed for threading 1/4-20 UNC holes in a range of ferrous materials. The spiral point geometry pushes chips forward ahead of the cutting zone, making it well suited for through-hole tapping operations where chip evacuation is critical. Manufactured from vanadium high speed steel (HSS-E) and finished with a steam oxide coating for improved lubricity and corrosion resistance, this tap handles demanding production environments. It carries an H2 thread limit and a right-hand thread direction. Licensed machinists, tool-and-die makers, and maintenance technicians are the primary users.

This tap is intended for through-hole applications in hardened steel, low-carbon steel, medium-carbon steel, and stainless steel. The plug chamfer distributes the cutting load across several leading threads, making it a practical choice for general-purpose tapping in CNC machining centers, drill presses, and manual tapping setups. The 3-flute configuration balances chip clearance with thread form strength across the material range listed. Coolant-through capability is not included in this design.

Key Features

• Spiral point geometry pushes chips forward for clean through-hole tapping
• Vanadium high speed steel (HSS-E) construction for improved wear and toughness over standard HSS
• Steam oxide coating reduces friction and provides light corrosion protection
• H2 thread limit for close-tolerance fits on 1/4-20 UNC threads
• Plug chamfer distributes cutting load gradually - suitable for most general-purpose through-hole work
• Right-hand thread direction, 3 flutes, no interrupted thread design

Compatibility

Designed for through-hole tapping of 1/4-20 UNC threads in hardened steel, low-carbon steel, medium-carbon steel, and stainless steel workpieces. Part of OSG Series 300.

Installation Notes

Machinists and maintenance technicians should ensure the workpiece is securely fixtured and the tap is properly aligned before starting the cut. Use an appropriate cutting fluid or tapping compound for the material being threaded - dry tapping of stainless steel is not recommended. Always back the tap out periodically to clear chips when tapping by hand. Follow shop safety procedures and machine manufacturer guidelines for spindle speed and feed rate selection.