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Description
Technical data for the G 1/8 inch tap
| Technical data | ||
|---|---|---|
| Nominal diameter d1 inches/mm | G 1/8 in | 9.72 mm |
| Thread pitch P inches/mm | 28 threads per inch | approximately 0.907 mm |
| Overall length l1 | 90 mm | |
| Flute length l2 | 18 mm | |
| Shank diameter d2 | 7 mm | |
| Square drive size a | 5.5 mm | |
| Tap drill diameter | 8.8 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 1/8 tap according to DIN 5156 has a diameter of 7 mm and a square size of 5.5 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 1/8 thread has 28 threads per inch; the feed is approximately 0.907 mm/rev.
G 1/8 inch machine tap for stainless steel
Machine Tap G 1/8 DIN 5156 C HSSE is a precision tap designed for producing parallel pipe threads G1/8 inch in through holes. Made of cobalt-alloyed HSSE high-speed steel, it provides long tool life and abrasion resistance when working in steel, stainless steel and cast iron.
The tap features a form C chamfer (2–3 cutting threads), which facilitates a fast, accurate start to tapping. The product meets the requirements of DIN 5156, ensuring dimensional compliance and reliability in professional applications.
G1/8 inch machine tap is widely used in precision piping installations and pneumatic and hydraulic systems where leak tightness and repeatability of the threaded connection are essential.
- High-quality HSSE steel – enhanced abrasion and heat resistance
- Form C chamfer – 2–3 cutting threads, ideal for through holes
- Application – for steel, stainless steel and cast iron
- Precision manufacturing – compliance with DIN 5156
- Excellent for G pipe connections in pneumatics, hydraulics and precision installations
Frequently asked questions
The question “how many mm is G 1/8 inch” or “how many cm is G 1/8 inch” often arises when selecting pipe tapping tools. Contrary to what one might expect, the value 1/8 inch (equivalent to 9.72 mm or 0.97 cm) does not indicate the thread diameter, but the nominal size of the pipe that the thread fits. In practice, the 1/8 inch G tap has an outside diameter of 9.721 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.
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| Courier GLS | Przelew24 / Prepayment | 14,76 zł gross | Delivery time 1 working day |
| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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