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Machine Tap M20X1.5 DIN 374/35 C HSSE
922988
€37.22 tax inc.
Net price: €30.26
Description
Material HSSE
Thread size M20x1.5
ChamferC (2–3) threads
Standard DIN 374
Technical data for the M20x1.5 blind hole tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M20x1.5 |
| Thread Pitch P | 1.5 mm |
| Helix Angle | 35° |
| Overall Length l1 | 125 mm |
| Flute Length l2 | 24 mm |
| Length l3 | 48 mm |
| Shank Diameter d2 | 16 mm |
| Square Drive Size a | 12 mm |
| Tap Drill Diameter | 18.5 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 auger in a meat grinder. The bottom of the hole stays clear, and the cutting edges do not encounter packed chips. The M20x1.5 tap has a reduced shank to DIN 374: diameter 16 mm, square drive 12 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 1.5 mm/rev, equal to the pitch of the M20x1.5 thread.
M20x1.5 spiral flute machine tap – metric fine thread for industrial hydraulics
The M20x1.5 spiral flute machine tap with a fine pitch is designed for precision tapping of blind holes in hydraulic systems. Its HSSE steel construction with 5% cobalt guarantees a hardness of 65-67 HRC and long cutting edge life even when machining stainless steels. The 35° spiral flute design directs chips backward, which is essential for blind-hole tapping. The 6H tolerance in accordance with DIN 374 guarantees leak-tight joints in pressure systems up to 400 bar.
Technical specifications of the M20x1.5 spiral flute machine tap
- Material versatility covering structural steels up to 900 MPa, alloy steels, austenitic stainless steels 304/316, aluminum, and copper alloys
- Durability of HSSE steel with 5% cobalt allows operation at temperatures up to 650°C in the cutting zone without loss of mechanical properties
- Compatibility with ER32 and ER40 tool holders and collets for precise clamping on machining centers with axial compensation
- Precision to tolerance class 6H for tight fit tolerances in series production of hydraulic and pneumatic components with demanding requirements
- Conforms to DIN 374 ensures standardized dimensions for metric fine threads and full interchangeability with tools from European manufacturers
- 35° flute geometry with form C chamfer allows tapping close to the bottom of a blind hole with a minimal incomplete thread length of 2-3 pitches
The M20x1.5 spiral flute tap is used in toolrooms and valve block production for CNC machining of hydraulic components. The fine pitch of 1.5 mm provides a larger contact area than the standard M20x2.5 thread. The tap drill diameter for the M20x1.5 thread is 18.5 mm according to fine thread tables.
Cutting data for the M20x1.5 blind hole machine tap
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 80-318 | 120-477 |
| MStainless steel | 5-10 | 80-159 | 120-238 |
| KCast iron | 5-15 | 80-239 | 120-358 |
| NAluminum | 10-25 | 159-398 | 238-597 |
Thread preparation M20x1.5 in a blind hole
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 18.5 mm
3 Tapping
M20x1.5
✓ Done!
Tolerance 6H
Standard: DIN 374 | 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 M20x1.5 HSSE machine tap for metric fine threads performs well in structural steels with a tensile strength up to 900 MPa, 304/316 austenitic stainless steels, aluminum, and brass. The 1.5 mm pitch is used in industrial hydraulics and pressure valves and fittings.
For the M20x1.5 metric fine thread in tolerance class 6H, the recommended tap drill diameter is 18.5 mm. The hole tolerance zone should fall within the range of 18.5 to 18.7 mm. Exceeding the upper limit results in an incomplete thread profile.
Yes, cooling with an oil emulsion of at least 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 minimum quantity lubrication (MQL).
Product accessories
HSSE 18.5 cobalt metal drill bit DIN 338
Reference: 13299 In stock > 10 items
€18.42
€22.66 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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