CHICAGO-LATROBE Oversized Spiral-Flute Tap

The CHICAGO-LATROBE 313525 spiral flute tap is used for threading blind holes in materials such as steel and aluminum. Its spiral flute design evacuates chips upward, preventing clogging. The semi-bottoming chamfer allows threading close to the bottom of the hole. This oversized H11 / 1B tap is ideal for applications requiring a slightly larger thread tolerance.

The CHICAGO-LATROBE 313525 is a 1/4"-20 UNC spiral flute tap with an H11 / 1B tolerance, 3 flutes, and a semi-bottoming chamfer. It is designed for oversized threading applications. The manufacturer part number is 313525. This tap is suitable for creating threads in blind holes where chip evacuation is critical.

You can source CHICAGO-LATROBE taps, including the 313525, through 3G Electric. As a global industrial equipment distributor since 1990, we handle full logistics, customs clearance, and delivery to worldwide destinations. Contact us for availability and lead time. We supply genuine CHICAGO-LATROBE tooling for your manufacturing needs.

For blind holes, choose a spiral flute tap like the CHICAGO-LATROBE 313525 to evacuate chips upward. Ensure the tap size matches your thread specification, such as 1/4"-20 UNC. The chamfer type—semi-bottoming in this case—determines how close to the hole bottom you can thread. Always use proper cutting fluid and follow manufacturer speed recommendations.