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Hand Tap M27X2 LH DIN 2181/2 6H HSS
006718
€64.74 tax inc.
Net price: €52.63
Description
Technical data for the M27x2 left-hand hand tap
| Technical data | |
|---|---|
| Nominal diameter d1 mm | M27 |
| Thread pitch P mm | 2 mm |
| Overall length l1 | 127 mm |
| Flute length l2 | 37 mm |
| Shank diameter d2 | 20 mm |
| Square drive size a | 16 mm |
| Tap drill diameter | 25 mm |
| Thread angle G | 60° |
| Tap tolerance | ISO2 6H |
Roughing tap and finishing tap – how much material each removes
Division of work in the 1–2 set
The M27x2 LH thread is cut into the wall of a hole with a diameter of 25 mm. The thread groove extends 1 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 8 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, 8 threads | 5° | 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 | follows the cut threads and produces the full 6H profile |
How to distinguish the taps in the set
The chamfer on No. 1 is 4 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 an M27x2 LH hole – sequence 1, 2
Hand tapping step by step
Thread M27x2 LH in four steps
ØDrilling
Drill bit 25 mm
1Roughing tap
Chamfer 8 threads
2Finishing tap
Chamfer 2 threads
✓Finished thread
Tolerance 6H
Turning sequence: half a turn counterclockwise, a quarter turn clockwise | Between taps: remove chips from the hole
Start with the hole. The drill diameter is easy to calculate: thread diameter 27 mm minus pitch 2 mm gives 25 mm. An undersized hole is a common cause of a tap twisting off in the workpiece.
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 67.5 mm, or 2.5 times the thread diameter (2.5 x 27 mm, shown as 2.5D in the drawing). Drill the hole deeper than the thread. The finishing tap has a chamfer spanning 2 threads, so approx. 2 incomplete threads remain near the bottom. The extra depth below the thread accommodates them along with the chips.
No. 1 – the roughing tap establishes thread alignment
Fit the roughing tap into a tap wrench and position it perpendicular to the surface. Check the angle from two sides, for example with a square. This is a left-hand thread, so turn in the opposite direction to usual: half a turn counterclockwise, then a quarter turn clockwise. 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 chips from the hole. Screw the finishing tap by hand into the cut threads — it should engage them naturally. Continue with the same turning sequence as for the roughing tap. The finishing tap removes the remaining material and cuts the groove to its full profile within 6H tolerance. Once it screws smoothly all the way in, the thread is complete — check it with an M27x2 LH screw.
Left-hand metric fine hand taps M27x2
M27x2 left-hand hand tap fine-thread HSS. Set of high-quality M27x2 left-hand metric fine-thread taps compliant with ISO 529, with a 60° angle, ISO DIN-13. The set includes a tap with a 8P chamfer and a tap with a 2P chamfer. Completing the thread requires using both taps in sequence, and a suitable tap wrench is essential for operation. Our M27x2 left-hand hand taps fine-thread taps are manufactured with the highest precision from special molybdenum high-speed steel of HSS grade.
This tool steel offers exceptional cutting properties. Its composition significantly increases tool hardness and resistance to extremely demanding cutting conditions. The cutting edges of M27x2 left-hand hand taps resist breakage, cracking, chipping, and other types of mechanical damage, extending their service life and thereby reducing overall machining costs.
Product accessories
Metal drill bit 25 NWKc HSS DIN 345 Baildon
Reference: 0384 In stock > 10 items
€31.58
€38.84 brutto
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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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