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Description
Material HSS
Thread size M24 left
Number of pieces3 pcs
Tolerance 6H ISO2
Technical data for the M24 left-hand hand tap
| Technical data | |
|---|---|
| Thread Diameter d1 | M24 |
| Thread Pitch P | 3 mm |
| Overall Length l1 | 110 mm |
| Flute Length l2 | 34 mm |
| Shank Diameter d2 | 18 mm |
| Square Drive Width Across Flats a | 14.5 mm |
| Tap Drill Hole | 21.0 mm |
Roughing, intermediate, and finishing taps – how much material each removes
Division of work in the 1–2–3 set
The M24 x3 LH thread is formed in the wall of a hole with a diameter of 21 mm. The thread groove extends 1.5 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 M24 LH hole – sequence 1, 2, 3
Hand tapping step by step
Thread M24 x3 LH in five steps
ØDrilling
Drill bit 21 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 24 mm minus pitch 3 mm gives 21 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 36 mm, or 1.5 times the thread diameter (1.5 x 24 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 M24 LH screw.
M24 left-hand HSS hand tap – 3-piece set for left-hand threads
The M24 left-hand hand tap set is a professional 3-piece HSS set for cutting left-hand internal threads with a diameter of 24 mm. The M24 left-hand tap set contains a taper tap, a plug tap, and a bottoming tap, allowing precise thread cutting in structural and machinery steels.
Key benefits of the M24 left-hand tap set
- Left-hand direction – essential in mechanisms that prevent self-loosening during clockwise rotation
- High-speed steel HSS 64 HRC – a proven material for machining structural steels with tensile strengths up to 800 MPa
- Compliance with DIN 352 – ensures tool dimensional precision and consistent quality
- Thread tolerance 6H – a standard accuracy class for machinery and industrial connections
- Industrial applications – machine tool spindles, counterclockwise-rotating shafts, securing components, differential drives
M24 left-hand taps are specialized tools for creating connections resistant to self-loosening. The M24 left-hand tap set is chosen by professionals in the machinery sector and heavy industry. Order the set and produce large-diameter left-hand threads with maximum precision.
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
An M24 thread with a pitch of 3 mm requires a hole diameter of 21 mm. The diameter is the same for right-hand and left-hand threads.
A left-hand tap rotates counterclockwise, in the opposite direction to a right-hand tap.
M24 left-hand threads are used in machine tool spindles, drive mechanisms, gas pipe connections, and components that prevent loosening.
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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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