OSG Extension Tap: 3/4"-10 UNC, H3 / 2B-3B, 4 Flute, Plug Chamfer

An OSG extension tap is used to cut internal threads in hard-to-reach or deep-hole applications. It is commonly employed in automotive, aerospace, and general manufacturing for threading blind or through holes where standard taps cannot reach. The 3/4"-10 UNC size suits heavy-duty fastening in steel and cast iron.

The OSG extension tap 1293601 is a 3/4"-10 UNC pulley tap with a plug chamfer and 4 flutes. It is made from black oxide high-speed steel with an H3 / 2B-3B tolerance class. This design provides good wear resistance and chip evacuation for threading in deep or obstructed locations.

You can source OSG extension taps worldwide through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to your facility. Contact us for availability and lead time on the OSG 1293601 or other pulley taps.

To select the correct OSG extension tap, match the thread size (3/4"-10 UNC), chamfer type (plug for blind holes), and material (black oxide HSS for steel). Confirm the tolerance class (H3 / 2B-3B) fits your thread fit requirement. For deep holes, ensure the tap length reaches the depth without excessive extension.