Osg 1305710808 Spiral Flute Tap 8-32 Unc 2B Ticn

Product Description

The OSG 1305710808 is a spiral flute tap designed for cutting right-hand internal threads to an 8-32 UNC specification with a 2B class of fit. Built from powdered metal and finished with a TICN (Titanium Carbon Nitride) coating, this tap is engineered for demanding threading operations in harder and more abrasive materials. It features a modified bottoming chamfer, allowing threads to be cut close to the bottom of blind holes. The 3-flute spiral design ejects chips upward out of the hole, reducing clogging and improving thread quality in deep or interrupted cuts. Overall length is 2.125 inches, and the shank diameter is 1.21 inches. This tap belongs to the OSG EXOTAP VC-10TI series, known for performance in high-heat and high-wear applications.

This tap is suited for threading operations in alloy steel, stainless steel, hardened steel, titanium, and high-nickel alloys. It is commonly used in precision machining, aerospace fabrication, tool-and-die work, and industrial manufacturing environments where thread integrity and tool life are critical. The modified bottoming chamfer makes it the correct choice when thread depth must extend near the base of a blind hole. A right-hand helix angle of 10 degrees aids chip evacuation in the materials listed above. Machinists and CNC operators working in job shops or production environments will find this tap appropriate for both manual tapping operations and machine tapping with appropriate toolholding.

Key Features

• 8-32 UNC thread form with 2B class of fit for standard tolerance internal threads
• Modified bottoming chamfer allows threading close to the bottom of blind holes
• 3-flute spiral design promotes upward chip ejection, reducing chip packing in blind holes
• TICN coating increases surface hardness and wear resistance for use in tough materials
• Powdered metal construction provides uniform grain structure and improved toughness over HSS
• H3 thread limit for consistent fit in 2B tolerance applications
• Right-hand flute and thread direction; no coolant-through feature

Compatibility

Designed for threading alloy steel, stainless steel, hardened steel, titanium, and high-nickel alloys. Part of the OSG EXOTAP VC-10TI series (Series 313TI). Suitable for both manual and machine tapping setups where 8-32 UNC internal threads are required.

Installation Notes

This tap is intended for use by trained machinists or CNC operators in a machine shop environment. Before tapping, verify that the pilot hole diameter and depth are correct for the 8-32 UNC thread specification and the 2B class of fit. Use appropriate tapping fluid or cutting oil for the work material, particularly with stainless steel, titanium, and high-nickel alloys, to reduce heat buildup and extend tool life. Never exceed the recommended spindle speed for the work material, and ensure the tap is properly supported to prevent deflection or breakage.