Polski 
- 98% satisfied customers
- 72h delivery
- 30 dni na zwrot
Description
Material HSS
Thread size M10 LH
Number of pieces3 pcs
Tolerance 6H ISO2
Technical data for the M10 left-hand hand tap
| Technical data | |
|---|---|
| Thread Diameter d1 | M10 |
| Thread Pitch P | 1.5 mm |
| Overall Length l1 | 70 mm |
| Flute Length l2 | 22 mm |
| Shank Diameter d2 | 7 mm |
| Square Drive Width Across Flats a | 5.5 mm |
| Tap Drill Hole | 8.5 mm |
Roughing, intermediate, and finishing taps – how much material each removes
Division of work in the 1–2–3 set
The M10 x1.5 LH thread is formed in the wall of a hole with a diameter of 8.5 mm. The thread groove extends 0.75 mm into the wall. A single tap would have to cut the entire groove at once – by hand, this creates high resistance and a risk of breakage. The set divides this work into three layers.
The drawing shows the entire set in operation. All three taps have the same shank and the same length. They differ in chamfer length: No. 1 has a taper spanning 7–10 threads, while No. 3 spans only 1–2 threads. The detail views at the hole wall show how the thread groove deepens after each tap.
| Tap | Chamfer | Material removed | How it works in the hole |
|---|---|---|---|
| No. 1 – roughing tap | long, 7–10 threads | approx. 60% | enters smoothly and establishes thread alignment |
| No. 2 – intermediate | medium, 3–5 threads | approx. 30% | screws into the previously cut threads and starts cutting only deeper in the hole |
| No. 3 – finishing tap | short, 1–2 threads | approx. 10% + sizing | turns easily and produces the full 6H profile |
How to identify the tap numbers in the set
The chamfer is the tapered end of the tap. No. 1 has the longest chamfer and No. 3 the shortest – the difference is immediately visible when they are placed side by side. No. 1 and No. 2 have shallower thread profiles; only No. 3 has the full profile. The number can also be identified on the shank: No. 1 has one ring, No. 2 has two, and No. 3 has none. Keep the set together and always start with the roughing tap.
How to tap an M10 LH hole – sequence 1, 2, 3
Hand tapping step by step
Thread M10 x1.5 LH in five steps
ØDrilling
Drill bit 8.5 mm
1Roughing tap
Removes approx. 60%
2Intermediate
Removes approx. 30%
3Finishing tap
Removes approx. 10%
✓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 10 mm minus pitch 1.5 mm gives 8.5 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 15 mm, or 1.5 times the thread diameter (1.5 x 10 mm, shown as 1.5D in the drawing). Drill the hole deeper than the thread. The clearance below the thread accommodates chips and the finishing tap chamfer.
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 and No. 3 – deepening and full profile
Unscrew the roughing tap and remove chips from the hole. Screw the intermediate tap by hand into the previously cut threads – it should engage them naturally. It turns easily at first and starts cutting only deeper in the hole. The finishing tap enters with almost no resistance and cuts the final portion of the profile only at the end. When it screws smoothly all the way in, the thread is ready – check it with an M10 LH screw.
M10 left-hand HSS hand tap DIN 352 – professional 3-piece set for left-hand threads
The M10 left-hand hand tap set is a complete set of three tools for cutting internal left-hand threads with a diameter of 10 mm and a pitch of 1.5 mm. M10 left-hand HSS hand taps are used in machine drives, machine tool spindles, and wherever the direction of rotation requires a thread opposite to the standard direction.
Key benefits of the M10 left-hand tap set
- 3-piece set (roughing, intermediate, and finishing taps) – progressive cutting distributes the load and extends tool life by 40%
- M10 left-hand thread – essential in spindles, lead screws, and mechanisms protected against self-loosening
- HSS high-speed steel – enables machining of structural and alloy steels with tensile strengths up to 800 MPa
- Tolerance 6H according to DIN 352 – precise fit with left-hand screws in tolerance class 6g
- Universal application – for carbon steels, gray cast iron, aluminum, and brass
The M10 left-hand hand tap set is suitable for manufacturing plants, machine tool service facilities, and industrial machinery repair shops. Use a drill bit with a diameter of 8.5 mm to prepare the hole for an M10 left-hand thread. Remember to turn counterclockwise.
Tolerance 6H — metric thread tolerance classes
| Class | Accuracy | Application | Status |
|---|---|---|---|
| 4H / 4g | High | Precision connections, hydraulics | — |
| 6H / 6g | Standard | Machine building, general-purpose | SELECTED |
| 7H / 8g | Low | Large clearance, easy assembly | — |
6H = internal thread (nut, hole) | 6g = external thread (screw)
Frequently asked questions
Use a 8.5 mm drill bit for an M10 thread with a pitch of 1.5 mm. The diameter is identical to that for a right-hand thread.
M10 left-hand threads are found in machine tool spindles, machine drives, and lead screws. They prevent self-loosening during equipment operation.
Three taps divide the work into stages, reducing the risk of jamming. This is particularly important with left-hand threads, with which the operator has less experience.
Product accessories
Reviews
No customer reviews for the moment.
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 |
Recommended for you
This website uses its own and third-party cookies to improve our services and show you advertising related to your preferences by analyzing your browsing habits. To give your consent to its use, press the Accept button.
Cookie preferences
Functional cookiesTechnical
Functional cookies are strictly necessary to provide the services of the shop, as well as for its proper functioning, so it is not possible to refuse their use. They allow the user to browse through our website and use the different options or services that exist on it.
Advertising Cookies
These are cookies that collect information about the advertisements shown to users of the website. They can be anonymous, if they only collect information about the advertising spaces shown without identifying the user, or personalised, if they collect personal information about the user of the shop by a third party, for the personalisation of these advertising spaces.
Analytics cookies
Collect information about the user's browsing experience in the shop, usually anonymously, although sometimes they also allow the user to be uniquely and unequivocally identified in order to obtain reports on the user's interests in the products or services offered by the shop.