Osg 1101512505 Spiral Point Tap 3/8-16 Unc Tin Hss

Product Description

The OSG 1101512505 is a spiral point plug tap designed for threading 3/8-16 UNC internal threads in through-hole applications. Made from vanadium high-speed steel (HSS) with a titanium nitride (TiN) coating, it delivers improved wear resistance and heat tolerance compared to uncoated HSS taps. The plug chamfer distributes cutting load across the first several threads, making it the standard choice for through-hole tapping where chip evacuation is straightforward. Three flutes push chips forward ahead of the tap, keeping the cutting zone clear. Overall length is 2.938 inches with a thread length of 0.976 inches (approximately 1-1/4 inches) and a shank diameter of 0.381 inches. Machinists, tool-and-die workers, and maintenance technicians are the primary users.

This tap suits general-purpose through-hole tapping in a wide range of workpiece materials. Per supplier data, rated material applications include aluminum, low-carbon steel, medium-carbon steel, high-carbon steel, alloy steel, die steel, stainless steel, hardened steel, cast iron, high-nickel alloy, and titanium. The H9 thread limit designates a tighter oversize tolerance range, making it well-suited for close-tolerance threading where fit class matters. It is appropriate for both manual hand-tapping and machine tapping setups where a spiral point style is called for.

Key Features

• 3/8-16 UNC thread form, right-hand cut
• Vanadium high-speed steel construction for toughness and wear resistance
• TiN coating extends tool life and reduces friction during cutting
• Plug chamfer distributes cutting forces across multiple leading threads
• 3-flute spiral point pushes chips forward for clean through-hole tapping
• H9 thread limit for controlled oversize tolerance in close-tolerance applications

Compatibility

Designed as a direct-use spiral point plug tap for 3/8-16 UNC through-hole threading across the material applications listed above. No specific machine or toolholder compatibility was stated in the input data.

Installation Notes

Installation should be performed by a qualified machinist or maintenance technician familiar with tapping feeds, speeds, and cutting fluid selection for the workpiece material. Secure the workpiece fully before tapping to prevent movement and tap breakage. Use an appropriate cutting fluid or tapping oil for the material being threaded. For machine tapping, verify spindle speed and feed rate are appropriate for the tap diameter and material before engaging the cut.