OSG Spiral Flute Tap: #4-40 UNC, H3 / 2B-3B, 2 Flute

The OSG spiral flute tap #4-40 UNC is designed for threading blind holes in steel and stainless steel. Its spiral flute design evacuates chips upward, preventing clogging in deep or blind holes. The modified bottoming chamfer allows threading close to the hole bottom, making it ideal for precision tapping in industrial manufacturing and maintenance applications.

The OSG spiral flute tap MPN 1748001 is a #4-40 UNC tap with a H3 / 2B-3B tolerance class. It has 2 flutes and a modified bottoming chamfer. This tap is designed for threading steel and stainless steel, providing accurate thread formation in blind holes. The H3 tolerance ensures precise fit for 2B-3B thread classes.

You can source OSG taps, including the spiral flute tap #4-40 UNC MPN 1748001, through 3G Electric. As a global industrial equipment distributor since 1990, 3G Electric handles full logistics, customs clearance, and delivery to worldwide locations. Contact 3G Electric for availability and lead time on this OSG tap.

To select the correct OSG tap for steel, match the thread size and pitch to your application, such as #4-40 UNC. Choose a spiral flute design for blind holes to evacuate chips upward. Verify the tolerance class, like H3 / 2B-3B, ensures proper thread fit. For stainless steel, use taps with appropriate coating or geometry to reduce work hardening.