Osg 1101502305 Spiral Point Tap 1/4-28 Unf Tin Hss

Product Description

The OSG 1101502305 is a spiral point plug tap designed for threading 1/4-28 UNF internal threads in a wide range of materials. Built from vanadium high-speed steel with a titanium nitride (TiN) coating, this tap delivers extended tool life and reduced friction in demanding production and maintenance environments. The spiral point geometry pushes chips forward ahead of the cutting action, making it well suited for through-hole tapping operations. With 3 flutes, a right-hand thread direction, and an H5 thread limit, it holds tight tolerance and is appropriate for use in both manual and machine tapping setups. Installers and machinists working in metalworking, HVAC fabrication, and mechanical assembly will find this tap a reliable production tool.

This tap is rated for use in aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, alloy steel, die steel, stainless steel, hardened steel, high-nickel alloy, and titanium. It is suited to shop, field fabrication, and light production environments where 1/4-28 UNF threaded holes are required. The plug chamfer style provides a good balance between ease of starting and thread engagement length, making it a general-purpose choice across a broad range of base materials and part configurations.

Key Features

• Spiral point geometry pushes chips forward for clean through-hole tapping
• TiN coating reduces friction and extends tool life across multiple materials
• Vanadium high-speed steel construction for toughness and wear resistance
• H5 thread limit for consistent, close-tolerance UNF threads
• Plug chamfer for general-purpose starting in a wide range of applications
• Right-hand cut, 3-flute design compatible with standard tapping equipment

Compatibility

Designed for tapping 1/4-28 UNF through-holes across a broad range of metals including aluminum, stainless steel, carbon steels, alloy steel, cast iron, high-nickel alloy, and titanium. Suitable for use with standard hand tap wrenches and machine tapping setups. Series 11015.

Installation Notes

Use appropriate cutting fluid or tapping lubricant matched to the workpiece material to maximize tool life and thread quality. Ensure the workpiece is securely clamped and the tap is aligned perpendicular to the hole before beginning. For machine tapping, set spindle speed according to the material being tapped and the tap manufacturer guidance. Inspect tap condition regularly and replace at first sign of chipping or excessive wear to avoid thread damage.