OSG 1/2"-20 UNF Spiral-Flute Extension Tap

This OSG extension tap is designed for threading blind holes in steel and stainless steel. Its spiral-flute design evacuates chips upward, making it ideal for deep-hole tapping where chip clearance is critical. The modified bottoming chamfer allows threading close to the bottom of the hole.

The OSG extension tap MPN 1769201 has a thread size of 1/2"-20 UNF, with a tolerance class of H3 / 2B-3B. It features 3 flutes and a modified bottoming chamfer. This spiral-flute tap is designed for steel and stainless steel applications.

You can source OSG extension taps worldwide through 3G Electric. As a global industrial equipment distributor since 1990, we handle full logistics, customs clearance, and delivery to your site. Contact us for availability and lead times on this OSG tap.

For stainless steel, select a spiral-flute tap like this OSG 1/2"-20 UNF model to manage chip evacuation. Ensure the tap tolerance (H3 / 2B-3B) matches your thread class requirement. Use appropriate cutting fluid and reduce speed by 20-30% compared to carbon steel tapping.