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Description
Material HSSE
Thread size M24
ChamferB (3.5–5.5) threads
Standard DIN 376
Technical data for the M24 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 clockwise to cut a right-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 machine tap for through holes – Narex HSSE with a long shank to DIN 376
The Narex M24 through-hole machine tap is a professional tool for cutting M24 internal threads in through holes on CNC and conventional machine tools. Its HSSE high-speed steel construction with 5% cobalt provides a hardness of 65-67 HRC and high thermal resistance in the cutting zone up to 650°C. As a renowned manufacturer with a long tradition, Narex guarantees the highest manufacturing quality and stable geometry. The long shank to DIN 376 provides increased clamping rigidity.
Technical specifications of the Narex M24 machine tap
- The Narex brand as a renowned cutting tool manufacturer with a long tradition, guarantees the highest manufacturing quality and consistent specifications
- Long shank to DIN 376 provides greater clamping rigidity and improved tool guidance, which is essential when tapping M24 diameters
- HSSE steel with 5% cobalt guarantees a hardness of 65-67 HRC and heat resistance up to 650°C, extending cutting edge life
- Tolerance 6H according to DIN 376 ensures accurate threads and full interchangeability with standard-grade fasteners
- Compatibility with ER32 and ER40 tool holders and tapping chucks with axial compensation for CNC machining centers
- Metric pitch of 3 mm compliant with DIN 13 for M24 coarse threads, the recommended tap drill diameter is 21 mm
The Narex M24 machine tap is used in series production of structural components, machine building, and maintenance departments for repairing and restoring large-diameter threads. Form B with straight flutes ensures efficient chip evacuation. The tool requires cooling with an oil emulsion at a minimum concentration of 8-10%.
| 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
Narex is a reputable manufacturer with a long tradition, offering tools with consistent quality and repeatable geometric specifications. Narex taps offer good value for money.
The recommended tap drill diameter for the M24 coarse thread is 21 mm. Accurate hole preparation ensures a full thread profile and minimizes the load on the tap.
The Narex M24 HSSE tap is suitable for structural steels up to 800 MPa, alloy steels, austenitic stainless steels, gray and ductile cast iron, and aluminum.
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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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