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Description
Material HSS
Thread size M18
ChamferC (2–3) threads
Standard DIN 376
Technical data for the M18 machine tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M18 |
| Thread Pitch P | 2.5 mm |
| Helix Angle | 35° |
| Overall Length l1 | 125 mm |
| Flute Length l2 | 34 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 blind-hole machine tap – HSS DIN 376
The M18 machine tap is a professional tool for cutting internal threads in blind holes. Made of HSS high-speed steel with a hardness of 62-64 HRC, it provides optimum cutting edge life and stable operation at temperatures up to 550°C. Tolerance 6H in accordance with DIN 376.
Main advantages of the M18 machine tap
- HSS material – hardness of 62-64 HRC and heat resistance up to 550°C
- Chamfer C (2÷3 threads) – optimal for blind holes
- Tolerance 6H – standard accuracy grade for bolted joints
- Compliance with DIN 376 – verified dimensional quality
- 35° spiral flutes – efficient rearward chip evacuation
The M18 machine tap is used in toolrooms and maintenance departments. The recommended tap drill diameter is 15.5 mm.
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 | 88-353 | 220-882 |
| MStainless steel | 5-10 | 88-176 | 220-440 |
| KCast iron | 5-15 | 88-265 | 220-662 |
| NAluminum | 10-25 | 176-442 | 440-1105 |
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)
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
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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