OSG Extension Tap: 1/4"-20 UNC, H5 / 2B-3B, 2 Flute

An OSG extension tap is used to thread blind or deep holes where standard taps cannot reach. The 1/4"-20 UNC spiral-flute design evacuates chips upward, making it ideal for production threading in steel, stainless, and aluminum across machining, automotive, and general manufacturing applications.

This OSG extension tap has a 1/4"-20 UNC thread, H5 tolerance for 2B-3B class fit, 2-flute spiral-flute design, and modified bottoming chamfer. The MPN is 1652501708. It is designed for threading multiple materials including steel and aluminum in deep or blind-hole applications.

3G Electric supplies OSG extension taps worldwide, handling full logistics and customs clearance. As a global industrial sourcing partner, we provide genuine OSG cutting tools like the 1/4"-20 UNC spiral-flute tap (MPN 1652501708) to customers in machining, automotive, and manufacturing sectors across all regions.

Select an OSG extension tap based on thread size (e.g., 1/4"-20 UNC), hole depth, material, and chamfer type. For blind holes, use a modified bottoming chamfer. Spiral-flute taps like this OSG model are best for chip evacuation in deep holes. Always match tap tolerance (H5) to the required thread class (2B-3B).