Osg 1101505005 Spiral Point Tap 1/2-20 Unf Tin Hss

Product Description

The OSG 1101505005 is a spiral point tap designed for threading 1/2-20 UNF right-hand internal threads in a wide range of ferrous and non-ferrous materials. Built from vanadium high-speed steel and finished with a titanium nitride (TiN) coating, this plug-chamfer tap delivers extended tool life and reduced friction during cutting. It features 3 flutes, an H5 thread limit, and a 2B class of fit, making it suitable for standard tolerance threaded holes. Overall length is 3.375 inches with a thread length of 0.799 inches and a shank diameter of 0.367 inches. Machinists and toolroom technicians will find this tap well suited for production and maintenance threading operations.

The 1101505005 is intended for use in machine tapping applications where a spiral point design pushes chips ahead of the tap and out of the hole. It is appropriate for through-hole threading in materials including aluminum, low-carbon steel, medium-carbon steel, high-carbon steel, alloy steel, stainless steel, hardened steel, die steel, cast iron, high-nickel alloy, and titanium. The plug chamfer provides a gradual entry and even load distribution across the leading threads, making it a standard choice for CNC machining centers, drill presses, and tapping attachments in both production shop and maintenance environments.

Key Features

• 1/2-20 UNF thread form, right-hand, 2B class of fit with H5 thread limit for standard tolerance applications
• 3-flute spiral point geometry pushes chips forward through the hole, suited for through-hole tapping
• Vanadium high-speed steel construction provides toughness and wear resistance across a broad material range
• TiN coating reduces friction and heat buildup, extending tool life in production runs
• Plug chamfer (7-10 thread lead) allows controlled thread entry and consistent load on cutting edges
• No coolant-through design; compatible with flood coolant or tapping fluid applied externally

Compatibility

Designed for machine tapping of 1/2-20 UNF through-holes in materials including aluminum, low-carbon steel, medium-carbon steel, high-carbon steel, alloy steel, stainless steel, hardened steel, die steel, cast iron, high-nickel alloy, and titanium. Not intended for blind-hole applications where chip evacuation is restricted.

Installation Notes

This tap is intended for use by machinists and toolroom technicians operating machine tapping equipment such as CNC machining centers, drill presses with tapping attachments, or dedicated tapping machines. Always ensure the workpiece is securely fixtured and the spindle speed and feed rate are set per the tap manufacturer recommendations for the specific workpiece material before engaging the tap. Apply an appropriate cutting fluid or tapping oil to reduce heat and improve surface finish on the threaded form. Inspect the tap for wear or chipping before each use and replace if cutting edges show damage to avoid thread quality issues or tap breakage.