Osg 1737408 Spiral Point Tap 1/4-20 Unc Ticn Hss

Product Description

The OSG 1737408 is a spiral point tap designed to cut 1/4-20 UNC internal threads in a range of ferrous materials. It features three flutes with a plug chamfer, which provides a gradual cutting action suitable for through-hole applications. Manufactured from vanadium high-speed steel (HSS-E) and finished with a TiCN (titanium carbonitride) coating, this tap delivers improved wear resistance and heat tolerance compared to uncoated HSS taps. The H5 thread limit and 2B class of fit make it appropriate for standard fastener thread tolerances in production and maintenance machining.

This tap is suited for through-hole tapping operations in materials including low-carbon steel, medium-carbon steel, hardened steel, and stainless steel. The spiral point design pushes chips forward ahead of the tap, making it effective in CNC machining centers, drill presses, and tapping machines where a continuous chip flow is preferred. It is a common choice for job shops, production floors, and maintenance machinists working with 1/4-20 fastener threads in steel components.

Key Features

• 1/4-20 UNC thread form, H5 thread limit, 2B class of fit for standard tolerance applications
• Three-flute spiral point (gun tap) geometry pushes chips forward for use in through-hole applications
• Vanadium high-speed steel (HSS-E) construction provides toughness in ferrous materials
• TiCN coating increases surface hardness and reduces friction for extended tool life
• Plug chamfer with right-hand thread direction for conventional tapping setups
• No coolant-through design; suitable for flood or manual lubrication

Compatibility

Rated for use in hardened steel, low-carbon steel, medium-carbon steel, and stainless steel. Designed as a standard 1/4-20 UNC plug tap for through-hole tapping in applications requiring a 2B class of fit.

Installation Notes

This tap is intended for use by machinists and tooling professionals operating drill presses, tapping machines, or CNC machining centers. Secure the workpiece and ensure the tap is properly aligned before engagement to prevent breakage. Use an appropriate cutting fluid or tapping oil for the material being machined. Inspect the tap for wear or chip buildup between uses, and never force a tap that has stalled in the hole.