Hand taps G1″ DIN 5157 HSS – 2-piece set

The taps are used to make G-type cylindrical pipe threads (BSPP), compliant with DIN 5157. These are threads used in hydraulic and pneumatic systems, where tightness is achieved through additional sealing, not the thread itself.

No. A G-type thread is a cylindrical thread that does not provide a self-sealing connection. A gasket, washer or o-ring is required to achieve tightness.

The cylindrical thread (G) has a fixed diameter and is responsible for the connection of the components, while the tapered thread (R) narrows and can seal the connection by itself by wedging the components.

The kit includes a pre-tap (the so-called stripper), which starts the cutting process and guides the tool, and a finishing tap (finisher), which gives the final profile and thread accuracy. This increases precision and reduces the risk of tool damage.

This is not recommended. Skipping the pre-step (stripper) increases the load on the finishing tool and can lead to faster wear or damage, especially with larger thread diameters.

Taps made of HSS steel are suitable for machining mild steel, tool steel, stainless steel (with the right lubricant) and non-ferrous metals.

Yes. The use of threading oil significantly reduces friction, improves the quality of the thread surface, facilitates chip evacuation and extends tool life.

These taps are designed mainly for manual work. In some cases, they can be used in machines, but this requires an appropriate handle and control of operating parameters.

Use the right oil, perform retractable movements to break chips, and avoid excessive loading. It is particularly important to guide the tap axially to the bore.

Yes. G-type cylindrical threads provide high repeatability and allow multiple assembly and disassembly, provided the appropriate sealing element is used.