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Description
Technical data for the G 1 inch tap
| Technical data | ||
|---|---|---|
| Nominal diameter d1 inches/mm | G 1 inch | 33.25 mm |
| Thread pitch P inches/mm | 11 threads per inch | approximately 2.309 mm |
| Overall length l1 | 160 mm | |
| Flute length l2 | 30 mm | |
| Shank diameter d2 | 25 mm | |
| Square drive size a | 20 mm | |
| Tap drill diameter | 30.75 mm | |
| Chamfer | C (2÷3) P | |
| Thread angle G | 55° | |
| Thread standard | BSP DIN ISO 228 | |
| Cutting edge helix angle | 35° | |
How a spiral flute tap evacuates chips from a blind hole
The 35° flute works like a screw conveyor
The flutes of this tap follow a right-hand helix at an angle of 35° to the axis. The tap rotates clockwise and advances into the hole. The chip cut by the chamfer enters the flute, and the helix carries it upward like the auger in a meat grinder. The bottom of the hole stays clean, and the cutting edges do not encounter compacted chips. The shank of the G 1 tap to DIN 5156 has a diameter of 25 mm and a square size of 20 mm.
1
The 35° spiral flute carries chips upward from the chamfer.
2
The stepped chip exits the hole and breaks into short pieces.
3
The tap rotates clockwise to cut a right-hand thread.
4
Chamfer C: 2–3 incomplete threads on the tapered lead.
5
Clearance below the tap tip – min. 2 thread pitches above the bottom.
6
The G 1 thread has 11 threads per inch; the feed is approximately 2.309 mm/rev.
G 1 inch machine tap for blind holes
Machine Tap G 1 DIN 5156/35 HSSE Fra is a durable tap designed for cutting parallel pipe threads G1 inch in blind holes. Made of high-grade HSSE high-speed steel, it provides long tool life, wear resistance and stable performance in steel, stainless steel and cast iron.
This model features a short type C chamfer (2–3 cutting threads), which facilitates a reliable start to tapping and good control of the cutting process. Manufactured in accordance with the requirements of the DIN 5156/35 standard, it guarantees precise dimensions and reliability in industrial applications and pressurized installations.
G1 inch machine tap is a popular choice for hydraulics, pneumatics and piping installations where leak-tightness, repeatability and compliance with ISO 228 are essential.
- HSSE steel – increased resistance to wear and thermal loads
- Form C chamfer – 2–3 cutting threads, ideal for blind holes
- For use in steel, stainless steel and cast iron
- Manufacturing precision – compliance with DIN 5156/35
- Designed for BSP (G) pipe connections in industrial and workshop environments
Frequently asked questions
The question “how many mm is G 1 inch” or “how many cm is G 1 inch” often arises when selecting pipe tapping tools. Contrary to what one might expect, the value 1 inch (equivalent to 33.25 mm or 3.32 cm) does not indicate the thread diameter, but the nominal size of the pipe that the thread fits. In practice, the 1 inch G tap has an outside diameter of 33.25 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
Metal drill bit 30.75 NWKc HSS DIN 345 Baildon
Reference: 849343 In stock > 10 items
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Machine Tap G 1 DIN 5156 C HSSE Narex
Reference: 0000006322 In stock < 10 items
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Machine Tap G 1.1/2 DIN 5156 C HSSE Narex
Reference: 0000006301 In stock < 10 items
€139.47
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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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