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Description
Technical data for the G1/2 inch tap
| Technical data | ||
|---|---|---|
| Nominal diameter d1 inches/mm | G 1/2 in | 20.96 mm |
| Thread pitch P inches/mm | 14 threads per inch | approximately 1.814 mm |
| Overall length l1 | 125 mm | |
| Flute length l2 | 25 mm | |
| Shank diameter d2 | 16 mm | |
| Square drive size a | 12 mm | |
| Tap drill diameter | 19 mm | |
| Chamfer | C (2÷3) P | |
| Thread angle G | 55° | |
| Thread standard | BSP DIN ISO 228 | |
Where chips remain in a straight-flute tap
The flute holds the chips until the tap is reversed out
The straight flute runs parallel to the tap axis. It has no helix to carry chips upward. The chamfer cutting edges are not ground at an angle, so they do not push chips downward. Short chips break into fragments and remain in the flute, next to the cutting edges that produced them. They leave the hole only with the tap as it is reversed out. The shank of the G 1/2 tap according to DIN 5156 has a diameter of 16 mm and a square size of 12 mm.
1
Straight flute – chips remain in the flute, next to the cutting edges that produced them.
2
Chamfer C: 2–3 incomplete threads on the tapered lead.
3
The tap rotates clockwise to cut a right-hand thread.
4
Individual fragments exit at the top, onto the workpiece surface.
5
A few fragments fall below the tip and exit through the bottom of the hole.
6
The G 1/2 thread has 14 threads per inch; the feed is approximately 1.814 mm/rev.
G1/2 inch tap for stainless steel and cast iron
Machine Tap G 1/2 DIN 5156 C HSSE Narex is a precision tap designed for producing parallel pipe threads G1/2 inch in through holes. Made of high-grade cobalt-alloyed HSSE high-speed steel, it provides long tool life, wear resistance and reliable performance when machining steel, stainless steel and cast iron.
The tap features a form C chamfer (2–3 cutting threads), allowing a fast, accurate start to tapping. It meets the requirements of DIN 5156, ensuring dimensional compliance and the high manufacturing quality required in industrial applications and piping installations.
G1/2 inch machine tap is one of the most commonly used models in pneumatics, hydraulics, compressed air installations and industrial systems where connection leak tightness and standardization are essential.
- High-quality HSSE steel – increased resistance to wear and thermal loads
- Form C chamfer – 2–3 cutting threads, ideal for through holes
- Application – for steel, stainless steel and cast iron
- Conforms to DIN 5156 – dimensional repeatability and high precision
- Designed for BSP pipe connections in industrial environments
Frequently asked questions
The question “how many mm is G 1/2 inch” or “how many cm is G 1/2 inch” often arises when selecting pipe tapping tools. Contrary to what one might expect, the value 1/2 inch (equivalent to 20.96 mm or 2.09 cm) does not indicate the thread diameter, but the nominal size of the pipe that the thread fits. In practice, the 1/2 inch G tap has an outside diameter of 20.96 mm, because G (BSP) pipe threads are designed for thick-walled pipes.
For this reason, always check the thread diameter in the technical data instead of converting inches directly to millimeters. In the BSP system, thread size is determined by the design of the entire installation, not just the nominal dimension.
No. A G (BSP) thread is a parallel pipe thread, meaning its diameter is constant along its entire length. Unlike taper threads (designated R or BSPT), G threaded connections are not self-sealing. This means that a G thread does not provide a seal on its own – it requires an additional sealing element, e.g. a flat gasket, O-ring or plastic washer. This sealing method is commonly used in hydraulic, pneumatic and industrial installations.
Product accessories
Countersink 1/2 inch G HSS DIN EN 24231 Cztool
Reference: 11660 In stock < 10 items
€13.68
€16.83 brutto
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| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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