H-Oversize HSS Tapered Tap

The H-Oversize HSS Tapered Tap, identified as “HO w/ Pilot Hole,” is a high-speed steel tapered tap designed for creating threads to accommodate HO Ductile Iron Plugs. This tap is crucial for preparing castings for repair using these specialized plugs.

The H-Oversize HSS Tapered Tap is a high-quality, high-speed steel (HSS) tap specifically designed for thread creation in preparation for the installation of HO Ductile Iron Plugs. This tap is identified with the designation “HO w/ Pilot Hole”. It has a specific design feature (taper) that aids in starting the threading process.

This tapered tap is intended for use with the HO Ductile Iron Plug, which has a Thread Length “A” of 1 inch and a Diameter at the Small End “B” of 1.147 inches. The corresponding tapered reamer, typically used to prepare the hole before tapping.

General Usage of Tapered Taps:

Tapered taps are designed to gradually cut threads along their entire length. When working with thicker metal castings, it is essential to first use a tapered reamer to create a properly sized and shaped hole. This pre-reaming step helps to ensure a reasonable lifespan for the tap by reducing the amount of material it needs to remove.

Proper technique is crucial when using a tapered tap. Consistent downward pressure, combined with a steady turning motion, is necessary to create clean and accurate threads. Furthermore, the use of a good quality tapping fluid, such as Irontite’s TAP-O (468-9920-08), is strongly recommended at all times. Tapping fluid helps to lubricate the cutting action, reduce friction and heat buildup, and flush away chips, all of which contribute to a smoother threading process and extend the life of the tap.

The H-Oversize HSS Tapered Tap is a vital tool for achieving secure and reliable repairs using HO Ductile Iron Plugs in ferrous castings.