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Hand Tap M7X0.5 LH ISO 529/2 6H HSS
12391
Thread size: M7x0,542 sizes of this tap
€45.32 tax inc.
Net price: €36.84
Description
Technical data for the M7x0.5 left-hand hand tap
| Technical data | |
|---|---|
| Nominal diameter d1 mm | M7 |
| Thread pitch P mm | 0.5 mm |
| Overall length l1 | 66 mm |
| Flute length l2 | 19 mm |
| Shank diameter d2 | 4.5 mm |
| Square drive size a | 3.5 mm |
| Tap drill diameter | 6.5 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 M7x0.5 LH thread is cut into the wall of a hole with a diameter of 6.5 mm. The thread groove extends 0.25 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 M7x0.5 LH hole – sequence 1, 2
Hand tapping step by step
Thread M7x0.5 LH in four steps
ØDrilling
Drill bit 6.5 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 7 mm minus pitch 0.5 mm gives 6.5 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 17.5 mm, or 2.5 times the thread diameter (2.5 x 7 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 M7x0.5 LH screw.
M7x0.5 left-hand hand taps
M7x0.5 hand tap left-hand fine-thread HSS for cutting left-hand threads. The tolerance class of the finished threads is 6H. M7x0.5 hand taps left-hand versions are sold as a set of two: No. 1 with a 8P chamfer and No. 2 with a 2P chamfer. Thread cutting takes place in two successive operating steps, with the machining allowance appropriately divided between the two tools. Offered by us M7x0.5 left-hand hand taps are manufactured in accordance with the DIN 529 dimensional standard from modern high-alloy HSS – High Speed Steel. This steel offers increased strength under severe cutting conditions and increased resistance to all types of mechanical damage (breakage, cracks, nicks, chipping). The use of HSS increases machining productivity and cutting accuracy. The tolerance zone of the finished threads is ISO2 – 6H. They are intended for machining materials in categories P1.2 – P1.3 (metals, unalloyed steels, aluminum, copper, bronze, brass, and plastics).
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Shipping
All orders are delivered by courier company GLS. For orders exceeding 369 PLN gross shipping is FREE
| 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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