Osg 1412808 Spiral Flute Tap 8-32 Unc Hss Ticn

Product Description

The OSG 1412808 is a spiral flute tap designed to cut 8-32 UNC internal threads in a wide range of ferrous and non-ferrous materials. It is manufactured from high-speed steel and finished with a titanium carbonitride (TiCN) coating that reduces friction and extends tool life under production conditions. The plug chamfer — 3 to 5 lead threads — allows this tap to start easily in a drilled through-hole or a deep blind hole. With a 50-degree helix angle and three right-hand spiral flutes, the tool efficiently evacuates chips up and out of the hole, making it well suited for interrupted cuts and sticky materials. Machinists and maintenance technicians use this tap in CNC machining centers, drill presses, and hand-tapping applications.

The OSG 1412808 is suited for through-hole and blind-hole tapping in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. At 2.125 inches overall length, it fits standard tap holders and extension arms used in both production and maintenance-repair environments. The H3 thread limit produces a 2B class of fit, which is the standard tolerance for general-purpose UNC fastener threads across commercial and industrial assemblies.

Key Features

• 8-32 UNC thread form, H3 limit, 2B class of fit for general-purpose thread tolerance
• TiCN coating increases surface hardness and reduces built-up edge in aluminum and steel
• 50-degree right-hand helix angle promotes upward chip evacuation in blind holes
• Plug chamfer provides reliable thread lead-in without bottoming requirements
• High-speed steel construction withstands intermittent cutting loads and regrinding
• No coolant-through requirement — compatible with flood coolant or cutting oil applied externally

Compatibility

Designed for use in materials including aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. Fits standard 8-32 tap holders, tap wrenches, and CNC tapping chucks accepting a 0.168-inch shank diameter.

Installation Notes

This tap is installed by a machinist or maintenance technician using a tap wrench, tapping head, or CNC rigid-tapping cycle. Always ensure the pilot hole is drilled to the correct tap-drill diameter for 8-32 UNC before tapping. Apply appropriate cutting fluid for the workpiece material to reduce heat and extend tool life. Reverse the tap periodically when hand-tapping to break chips and prevent binding.