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Description
Material HSSE
Thread size M24
ChamferB (3.5–5.5) threads
Standard DIN 376
Technical data for the M24 left-hand machine tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M24 |
| Thread Pitch P | 3 mm |
| Overall Length l1 | 160 mm |
| Flute Length l2 | 38 mm |
| Shank Diameter d2 | 18 mm |
| Square Drive Size a | 14.5 mm |
| Tap Drill Diameter | 21 mm |
| Chamfer | B (3.5÷5.5) P |
| Thread tolerance | 6H |
How the type B through-hole chamfer pushes chips down the hole
Chips exit at the bottom instead of returning through the thread
The type B through-hole chamfer has a chip breaker at the tip of the tap – an angled notch in the cutting edges. The chip breaker directs chips down the hole, ahead of the tap tip. The chips curl into a spring shape, break into short pieces and exit the hole on the other side of the workpiece. The threads already cut remain clean because the chips do not pass through them on their way up. The M24 x3 tap has a reduced shank to DIN 376: diameter 18 mm, square size 14.5 mm.
1
Straight flute – chips do not enter it; the flute carries lubricant to the cutting edges.
2
The chip breaker at the tip of the tap directs chips down the hole.
3
The tap rotates counterclockwise – this is how it cuts a left-hand thread.
4
B chamfer: 3.5–5.5 incomplete threads on the entry taper.
5
The chips break into segments: individual pieces at the top of the hole, with progressively more farther down. They fall out below the workpiece.
6
Feed 3 mm/rev, equal to the pitch of the M24 x3 thread.
M24 left-hand machine tap for through holes – HSSE for rotating components
The M24 left-hand machine tap for through holes is a specialized tool for cutting internal left-hand threads with a diameter of 24 mm in components that rotate clockwise. Made of HSSE high-speed steel with 5% cobalt, it guarantees a hardness of 65-67 HRC and optimum tool life when machining difficult-to-machine materials. The left-hand thread in the large M24 diameter is used in drive shafts, machine tool spindles, and adjustment mechanisms requiring protection against self-loosening during operation.
Key benefits of the M24 left-hand machine tap for through holes
- Left-hand thread direction (LH) used in components that rotate clockwise, where a right-hand thread could loosen under inertial forces and torque
- Long shank to DIN 376 provides greater clamping rigidity and better tool guidance, which is essential when tapping large diameters
- HSSE steel with 5% cobalt guarantees a hardness of 65-67 HRC and thermal resistance up to 650°C required when machining alloy and stainless steels
- Tolerance 6H according to DIN 376 ensures accurate left-hand threads and full interchangeability with left-hand threaded fasteners
- Compatibility with ER32 and ER40 tool holders and tapping chucks with axial compensation for CNC machining centers
- Metric pitch of 3 mm complies with DIN 13, recommended tap drill diameter of 21 mm for a full left-hand thread profile
The M24 left-hand machine tap is used in the machinery industry to manufacture drive shafts, machine tool spindles, and rotating components requiring protection against self-loosening. M24 left-hand threads are found in tensioners, turnbuckles, and adjustment mechanisms. Cooling with an emulsion containing EP additives at a concentration of 8-10% is recommended.
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 66-265 | 198-795 |
| MStainless steel | 5-10 | 66-133 | 198-399 |
| KCast iron | 5-15 | 66-199 | 198-597 |
| NAluminum | 10-25 | 133-332 | 399-996 |
Thread preparation M24 in a through hole
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 21.0 mm
3 Tapping
M24
✓ Done!
Tolerance 6H
Standard: DIN 376 | Chamfer: B (straight) | Application: through holes
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
The M24 left-hand thread is used in drive shafts, machine tool spindles, tensioners, turnbuckles, and wherever a component rotates clockwise and protection against self-loosening is required.
The recommended tap drill diameter for the M24 left-hand thread is 21 mm — identical to that for the right-hand thread. Thread direction does not affect the tap drill diameter.
Yes, the M24 left-hand thread requires screws and nuts with left-hand threads. Standard right-hand threaded fasteners are not compatible and may damage the thread.
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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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