OSG Spiral Flute Tap: 7/8"-14 UNF, H4 / 2B-3B, 4 Flute

An OSG spiral flute tap is used for threading blind holes in materials such as steel, stainless steel, and aluminum. The spiral flute design pulls chips upward and out of the hole, preventing chip clogging and ensuring clean threads. This 7/8"-14 UNF tap with modified bottoming chamfer is ideal for threading close to the bottom of a blind hole.

The OSG 2939201 is a general purpose spiral flute tap with size 7/8"-14 UNF, H4 / 2B-3B tolerance, 4 flutes, and a modified bottoming chamfer. It is designed for threading blind holes in ferrous and non-ferrous materials. The H4 tolerance allows for adjustment to achieve 2B or 3B class fit.

3G Electric supplies and delivers OSG taps, including the 2939201 spiral flute tap, to customers worldwide. As a global industrial solutions provider, we handle full logistics and customs clearance for international orders. Contact us for pricing and lead time on this and other OSG threading tools.

Select a spiral flute tap with a modified bottoming chamfer when you need threads close to the bottom of a blind hole. Choose flute count based on material: 4 flutes for general purpose use. Ensure the tap tolerance (e.g., H4 / 2B-3B) matches your required thread class. OSG taps are a reliable choice for consistent thread quality.