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Description
Technical data for the PG 7 hand tap for electrical conduit
| Technical data | |
|---|---|
| Nominal diameter d1 | Pg 7 |
| Thread diameter | 12.5 mm |
| Thread pitch P | 20 threads per inch / 1.27 mm |
| Overall length l1 | 63 mm |
| Flute length l2 | 28 mm |
| Shank diameter d2 | 9 mm |
| Square drive size a | 7.1 mm |
| Thread angle | 80° |
| Thread standard | DIN 40430 |
| Tap drill hole | 11.35 mm |
Roughing tap and finishing tap – how much material each removes
Division of work in the 1–2 set
A Pg 7 thread is cut into the wall of a hole with a diameter of 11.35 mm. The thread groove extends 0.58 mm into the wall. A single tap would have to cut the entire groove at once – by hand, this means high resistance and a risk of breakage. The set divides this work into two passes.
The drawing shows the entire set in operation. Both taps have the same shank and the same length. They differ in their chamfer, the tapered tip: No. 1 has a chamfer spanning 5 threads, while No. 2 spans only 2 threads. The detail windows at the hole wall show how the thread groove deepens after each tap.
| Tap | Chamfer | Chamfer angle | Material removed | How it works in the hole |
|---|---|---|---|---|
| No. 1 – roughing tap | long, 5 threads | 7° | the main portion of the groove | enters smoothly and establishes thread alignment |
| No. 2 – finishing tap | short, 2 threads | 20° | the remainder, to the full profile | screws into the previously cut threads and produces the full thread profile |
How to distinguish the taps in the set
The chamfer on No. 1 is 2.5 times as long as the chamfer on No. 2 – the difference is immediately visible when you place them side by side. No. 1 has an incomplete thread profile; only No. 2 has the full profile. The number is also indicated on the shank: No. 1 has one ring, No. 2 has none. Keep the set together and always start with the roughing tap.
How to tap a Pg 7 hole – sequence 1, 2
Hand tapping step by step
Thread Pg 7 in four steps
ØDrilling
Drill bit 11.35 mm
1Roughing tap
Chamfer 5 threads
2Finishing tap
Chamfer 2 threads
✓Finished thread
Thread Pg 7
Turning sequence: half a turn clockwise, a quarter turn counterclockwise | Between taps: remove chips from the hole
Start with the hole. Pg thread pitch is specified in threads per inch: 25.4 mm : 20 threads = 1.27 mm. The 80° profile is shallow, so the 11.35 mm drill bit is only 1.15 mm smaller than the 12.5 mm thread diameter – less than one pitch. Drill the hole with this exact drill bit. An undersized hole is a common cause of a tap twisting off in the material.
Through hole or blind hole – how deep to drill
The set taps both types of holes. In a through hole, the thread extends through the full material thickness. In a blind hole, cut the thread to match the thread length of the fitting being installed. Drill the hole deeper than the thread. The finishing tap has a 2-thread chamfer, so approximately 2 incomplete threads remain near the bottom. The extra depth below the thread accommodates these along with the chips.
No. 1 – the roughing tap establishes thread alignment
Fit the roughing tap in the tap wrench and position it perpendicular to the surface. Check the angle from two sides, for example with a square. Turn half a turn clockwise, then a quarter turn counterclockwise. Reversing breaks the chip into short pieces – a slight crunch is normal. The first threads determine whether the thread will be straight.
No. 2 – the finishing tap produces the full profile
Unscrew the roughing tap and remove the chips from the hole. Screw the finishing tap into the cut threads by hand – it should engage them on its own. Continue turning at the same rhythm as with the roughing tap. The finishing tap removes the remaining material and cuts the groove to its full profile. When it screws in smoothly all the way, the thread is ready – check it with a fitting with a Pg 7 thread.
Czech-made taps from Tools Bu Bucovice
Professional NGSt tap for threading electrical conduits, complying with the dimensional standard DIN 40432. It is used to cut NGSt Pg-9 threads, with a Pg thread angle of 80. The tools are manufactured by Bucovice. The set available in our store includes two taps (roughing and finishing), and the complete thread is cut in two passes using a special tap wrench. Hand taps for electrical conduits are suitable for use in both small metalworking shops and large industrial plants. NGSt hand taps are made from special high-speed steel (HSS), which provides very high wear resistance, high resistance to demanding working conditions, and resistance to breakage, chipping, edge crumbling, dulling, and other types of mechanical damage. They are intended for individual customers and large industrial plants.
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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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