OSG Spiral Flute Tap: #4-40 UNC, H4 / 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 and enabling clean threads in materials up to 850 MPa tensile strength. It is commonly used in automotive, aerospace, and general manufacturing applications.

The OSG spiral flute tap #4-40 UNC has a thread size of #4-40, a 2-flute design, and a modified bottoming chamfer. It is rated H4 / 2B-3B for thread fit, meaning it produces Class 2B or 3B internal threads. The manufacturer part number is 1754201. It is designed for steel and stainless steel workpieces.

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 time on the OSG #4-40 UNC spiral flute tap (MPN 1754201). We supply genuine OSG tooling globally.

Select an OSG spiral flute tap based on thread size, chamfer type, and material. For blind holes in steel, use a modified bottoming chamfer to thread close to the hole bottom. Ensure the tap's hardness rating (e.g., H4) matches the required thread class (2B or 3B). Always match the tap to the workpiece material hardness for optimal tool life.