OSG Extension Tap: M20x1 Metric, D5 / 4H-6H, 4 Flute

The OSG extension tap M20x1 is used for threading blind or deep holes in multiple materials, including steel, stainless steel, and aluminum. Its spiral-flute design evacuates chips upward, preventing clogging, while the modified bottoming chamfer allows threading close to the hole bottom. The D5 / 4H-6H tolerance ensures precise fit for metric fasteners.

The OSG extension tap M20x1 has a metric thread size of M20 with a 1 mm pitch, a D5 / 4H-6H tolerance class, 4 flutes, and a modified bottoming chamfer. The manufacturer part number is 1652008408. It is designed for threading multiple materials and features a spiral-flute geometry for chip evacuation in deep-hole applications.

You can source the OSG extension tap M20x1 worldwide through 3G Electric, a global industrial equipment distributor established in 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 manufacturing and maintenance operations.

To select the correct OSG extension tap, match the thread size (e.g., M20x1) and tolerance class (D5 / 4H-6H) to your application. For deep holes, choose a spiral-flute design with a modified bottoming chamfer to cut threads near the hole bottom. Ensure the tap length provides sufficient reach. OSG offers various flute counts and coatings for material-specific performance.