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Description
Technical data of 1/2 inch left hand threader G
| Technical data | ||
|---|---|---|
| Nominal diameter d1 inch/mm | G 1/2 inch left | 20.96 mm |
| Thread pitch P inch/mm | 14 turns per inch | 1.81 mm |
| Overall length l1 | 80 mm | |
| Length of working part l2 | 22 mm | |
| Diameter of the shank part d2 | 16 mm | |
| Size of square drive a | 12 mm | |
| Threaded bore diameter | 19 mm | |
| Threaded hole diameter C | (2÷3) P | |
| Thread angle G | 55 degrees | |
| Thread standard | BSP DIN ISO 228 | |
Hand Tap 1/2 inch left for pipes
Hand Tap 1/2 inch left G DIN 5157/2 HSS is a specialized 2-piece set (ripper + finisher) designed for manual cutting of cylindrical G-type(BSP - British Standard Pipe) pipe threads with a left-hand cut direction and a profile angle of 55 degrees. The tool is made of high-quality HSS high-speed steel, which ensures durability, wear resistance and precise guidance in the hole.
The G 1/2 inch thread is characterized by an outside diameter of 20.955 mm, in accordance with ISO 228-1. The left-hand notch direction is particularly useful in installations where there is a risk of spontaneous loosening of connections - for example, in hydraulic, gas, rotary and pneumatic systems.
The 1/2 inch left-hand pipe threader complies with the requirements of DIN 5157/2, making it possible to progressively and safely produce threads in two stages - first with a peeler threader and then with a finisher.
- The 2-piece set (DIN 5157/2) - the peeler and finisher allow stepwise cutting of the left-hand thread.
- G 1/2 inch left-hand thread - external diameter 20.955 mm (according to ISO 228-1).
- Thread profile of 55 degrees - in accordance with the BSP standard, ensures high tightness and durability of the connection.
- Material: high-speed steel HSS - wear-resistant, suitable for steel, cast iron and non-ferrous metals.
- Specialized use - ideal for industrial installations and services that require a left-hand thread.
Hand Tap 1/2 inch left G DIN 5157/2 HSS is a reliable tool for professionals who want precision, durability and full BSP compliance in applications requiring left-hand threads.
Thread cutting stages for G 1/2 inch left hand threads in 2-piece set: ripper and finisher
Frequently asked questions
1. Why is the G 1/2 inch left-hand thread cutter 20.96 mm in diameter? G 1/2 inch how much is mm? And how many cm is it?
The question "G 1/2 inch how many mm" or "G 1/2 inch how many cm" often arises when selecting tools for pipe threading. Contrary to appearances, the value of 1/2 inch(that is, 20.96 mm or 2.09 cm) does not mean the diameter of the thread, but the nominal size of the pipe to which the thread fits. In practice, a 1/2 inch G thread has an outside diameter of 20.96 mm, because G (BSP) pipe threads are designed for pipes with thick walls.
For this reason, always check the thread diameter value in the technical data, and do not convert inches directly to millimeters. In the BSP system, the thread size is a result of the design of the entire installation, not just the nominal dimension.
2. Is the G thread a tapered thread and does it provide tightness?
No. G thread (BSP) is a cylindrical pipe thread, which means that its diameter is constant along its entire length. Unlike tapered threads (designated as R or BSPT), G thread connections are not self-sealing. This means that a G thread does not provide a seal by itself - it requires an additional sealing element, such as a flat gasket, O-ring or plastic washer. Such a sealing method is commonly used in hydraulic, pneumatic and industrial installations.
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