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Description
Technical data for the G 1 1/8 inch tap
| Technical data | ||
|---|---|---|
| Nominal diameter d1 inches/mm | G 1 1/8 inch | 37.90 mm |
| Thread pitch P inches/mm | 11 threads per inch | approximately 2.309 mm |
| Overall length l1 | 170 mm | |
| Flute length l2 | 34 mm | |
| Shank diameter d2 | 28 mm | |
| Square drive size a | 22 mm | |
| Tap drill diameter | 35.5 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 1.1/8 tap according to DIN 5156 has a diameter of 28 mm and a square size of 22 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 1.1/8 thread has 11 threads per inch; the feed is approximately 2.309 mm/rev.
G1.1/8 inch INOX machine tap
Machine Tap G 1.1/8 DIN 5156 C HSSE Narex is a precision tap designed for cutting parallel pipe threads G1.1/8 inch in through holes. Made of durable cobalt-alloyed HSSE high-speed steel, it provides long tool life, high wear resistance and effective tapping of steel, stainless steel and cast iron.
The tap features a form C chamfer (2–3 cutting threads), allowing a fast, accurate start without damaging the hole edge. Manufacture in accordance with DIN 5156 ensures precision and full compatibility with the BSP (G) pipe thread system used in industrial and hydraulic installations.
G1.1/8 inch machine tap is used for pipe connections where leak tightness, standardization and manufacturing repeatability are essential – in both workshop and production environments.
- High-quality HSSE steel – increased abrasion and heat resistance
- Form C chamfer – 2–3 cutting threads, ideal for through holes
- For use in steel, stainless steel and cast iron
- Compliance with DIN 5156 – precision and dimensional repeatability
- Designed for G (BSP) pipe connections in industrial environments
Frequently asked questions
The question “how many mm is G 1 1/8 inch” or “how many cm is G 1 1/8 inch” often arises when selecting pipe tapping tools. Contrary to what one might expect, the value 1 1/8 inch (equivalent to 37.9 mm or 3.79cm) does not indicate the thread diameter, but the nominal size of the pipe that the thread fits. In practice, the 1 1/8 inch G tap has an outside diameter of 37.9 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 | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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