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Description
Material HSSE
Thread size M18
ChamferC (2–3) threads
Standard DIN 376
Technical data for the M18 blind-hole tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M18 |
| Thread Pitch P | 2.5 mm |
| Helix Angle | 35° |
| Overall Length l1 | 125 mm |
| Flute Length l2 | 25 mm |
| Length l3 | 48 mm |
| Shank Diameter d2 | 14 mm |
| Square Drive Size a | 11 mm |
| Tap Drill Diameter | 15.5 mm |
| Chamfer | C (2÷3) P |
| Thread tolerance | 6H |
How a spiral flute tap evacuates chips from a blind hole
The 35° flute works like a screw conveyor
The flutes of this tap follow a right-hand helix at an angle of 35° to the axis. The tap rotates clockwise and advances into the hole. Chips cut by the chamfer enter the flute, and the helix carries them upward like the screw in a meat grinder. The bottom of the hole stays clean, and the cutting edges do not encounter packed chips. The M18 x2.5 tap has a reduced shank according to DIN 376: diameter 14 mm, square size 11 mm.
1
The 35° spiral flute carries chips upward from the chamfer.
2
The stepped chip exits the hole and breaks into short pieces.
3
The tap rotates clockwise to cut a right-hand thread.
4
Chamfer C: 2–3 incomplete threads on the tapered lead.
5
Clearance below the tap tip – min. 2 thread pitches above the bottom.
6
Feed 2.5 mm/rev, equal to the pitch of the M18 x2.5 thread.
M18 spiral-flute machine tap – for blind holes
The M18 spiral flute machine tap is a professional tool for cutting internal threads in blind holes up to 2.5D deep. The 35° spiral flute design ensures efficient backward chip evacuation, eliminating the risk of jamming during blind tapping. HSSE steel construction with 5% cobalt ensures a hardness of 65-67 HRC and thermal stability up to 650°C. The long shank according to DIN 376 increases clamping rigidity in machine tool holders. The 6H tolerance ensures the dimensional repeatability required in series production.
Key advantages of the M18 spiral flute machine tap
- 35° spiral flute geometry directs chips backward during cutting, which is essential when tapping blind holes without the risk of damaging the hole bottom
- Durability enhanced by the addition of 5% cobalt allows operation at temperatures up to 650°C in the cutting zone without loss of the tool's mechanical properties
- Tolerance class 6H precision in accordance with DIN 376 guarantees full thread interchangeability and dimensional repeatability in series production
- Material versatility covering structural steels up to 900 MPa, austenitic stainless steels 304/316, aluminum, and copper and brass alloys
- Chamfer form C allows tapping close to the bottom of a blind hole with a minimal incomplete thread length of just 2-3 pitches
- Compatibility with ER32 and ER40 tool holders and tapping chucks with axial compensation for CNC machining centers and automatic lathes
The M18 spiral flute tap is suitable for automotive series production and assembly lines requiring high repeatability. The standard pitch of the M18 thread is 2.5 mm, with a tap drill diameter of 15.5 mm. The tool is compatible with standard mineral oil-based tapping lubricants and coolant emulsions.
Cutting data for the M18 blind-hole machine tap
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 88-354 | 220-885 |
| MStainless steel | 5-10 | 88-177 | 220-442 |
| KCast iron | 5-15 | 88-265 | 220-662 |
| NAluminum | 10-25 | 177-442 | 442-1105 |
Thread preparation M18 in a blind hole
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 15.5 mm
3 Tapping
M18
✓ Done!
Tolerance 6H
Standard: DIN 376 | Chamfer: C (spiral flute) | Application: blind 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 M18 HSSE spiral flute machine tap is suitable for structural steels up to 900 MPa, 304/316 austenitic stainless steels, aluminum, brass, and gray cast iron. The M18 size is used in steel structures and machine building.
For the M18x2.5 thread in tolerance class 6H, the tap drill diameter should be 15.5 mm. The permissible hole tolerance range is 15.5-15.75 mm. A smaller hole increases cutting torque, while a larger hole reduces the thread class.
Yes, cooling with an oil emulsion at a minimum concentration of 8% or with tapping oil is recommended and extends tool life by a factor of 2-3. Intensive cooling is required when machining stainless steels, while aluminum can be tapped with minimal lubrication.
Product accessories
M18 DIN 376 C HSSE Machine Threader
Reference: 0000008242 In stock < 10 items
€21.58
€26.54 brutto
HSSE 15.5 cobalt metal drill bit DIN 338
Reference: 13293 In stock < 10 items
€15.26
€18.77 brutto
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Shipping
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| 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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