OSG Extension Tap: 1/4"-20 UNC, H3 / 2B-3B, 3 Flute

An OSG extension tap is used to cut internal threads in deep or hard-to-reach holes in steel and stainless steel. Its extended reach and spiral-flute design efficiently evacuate chips, making it ideal for automotive, aerospace, and general machining applications where standard taps cannot access the workpiece.

The OSG extension tap 1767901 has a thread size of 1/4"-20 UNC, with a thread tolerance of H3 / 2B-3B. It features 3 flutes and a modified bottoming chamfer, designed for tapping steel and stainless steel. This spiral-flute tap provides reliable chip evacuation in deep-hole applications.

3G Electric supplies OSG extension taps worldwide, handling full logistics and customs clearance for global delivery. As a sourcing specialist across 14 industrial departments, we provide genuine OSG taps like the 1767901 to customers in any country. Contact us for a quote and delivery options.

To select the right OSG extension tap for steel, match the thread size (e.g., 1/4"-20 UNC) and tolerance (H3 / 2B-3B) to your hole requirements. Choose a spiral-flute design for deep holes to ensure chip evacuation. Verify the chamfer type—modified bottoming for blind holes—and confirm the tap is rated for steel or stainless steel.