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

The OSG spiral flute tap #4-40 UNC is designed for threading blind holes in ferrous and non-ferrous materials. Its spiral flute design lifts chips upward, preventing clogging and ensuring clean threads. It is commonly used in automotive, aerospace, and general manufacturing applications where precise internal threads are required.

The OSG spiral flute tap #4-40 UNC has a thread size of #4-40 UNC, a H3 / 2B-3B tolerance class, 3 flutes, and a modified bottoming chamfer. The manufacturer part number is 2911401. It is a general purpose spiral-flute tap suitable for threading blind holes in various materials.

You can source OSG spiral flute taps worldwide through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to your location. Contact us for availability and lead times on the OSG spiral flute tap #4-40 UNC (MPN 2911401) and other OSG tooling.

For blind holes, choose a spiral flute tap like the OSG #4-40 UNC with a modified bottoming chamfer to thread close to the hole bottom. Ensure the tap's tolerance class (H3 / 2B-3B) matches your required thread fit. Use proper cutting fluid and speed based on material hardness to extend tool life and achieve clean threads.