OSG 1/2"-13 UNC Spiral-Flute Extension Tap

The OSG Extension Tap is used for threading blind or deep holes in metalworking applications. Its extended reach allows tapping in hard-to-access areas, common in automotive, aerospace, and general manufacturing. The 3-flute spiral design aids chip evacuation, while the plug chamfer provides a versatile entry for through or blind holes.

This OSG tap has a 1/2"-13 UNC thread size with an H3 / 2B-3B tolerance class. It features 3 flutes, a plug chamfer, and is made from high-speed steel. The manufacturer part number is 1299000. It is designed for threading steel and other materials where extended reach is required.

You can source the OSG Extension Tap 1/2"-13 UNC worldwide through 3G Electric. As a global industrial equipment distributor since 1990, we handle full logistics, customs clearance, and delivery to your location. Contact us for availability and lead time; we supply genuine OSG tooling for international orders.

To select the correct OSG extension tap, match the thread size (e.g., 1/2"-13 UNC) and tolerance class (H3 / 2B-3B) to your hole requirements. Consider material type and hole depth—the extended length reaches deep or obstructed areas. For blind holes, a plug chamfer is suitable. Always verify the tap's flute count and coating for chip evacuation.