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Description
Material HSSE
Thread size M20
ChamferC (2–3) threads
Standard DIN 376
Technical data for the M20 HSSE INOX general-purpose machine tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M20 |
| Thread Pitch P | 2.5 mm |
| Overall Length l1 | 140 mm |
| Flute Length l2 | 34 mm |
| Shank Diameter d2 | 16 mm |
| Square Drive Size a | 12 mm |
| Tap Drill Diameter | 17.5 mm |
| Chamfer | C (2÷3) P |
| Thread tolerance | 6H |
Where chips remain in a straight-flute tap
The flute holds the chips until the tap is reversed out
The straight flute runs parallel to the tap axis. There is no helix to carry chips upward. The chamfer cutting edges are not ground at an angle, so they do not push chips downward. Short chips break into fragments and remain in the flute, next to the cutting edges that produced them. They leave the hole only when the tap is backed out. The M20 x2.5 tap has a reduced shank to DIN 376: diameter 16 mm, square size 12 mm.
1
Straight flute – chips remain in the flute, next to the cutting edges that produced them.
2
Chamfer C: 2–3 incomplete threads on the tapered lead.
3
The tap rotates clockwise to cut a right-hand thread.
4
Individual fragments exit at the top, onto the workpiece surface.
5
A few fragments fall below the tip and exit through the bottom of the hole.
6
Feed 2.5 mm/rev, equal to the pitch of the M20 x2.5 thread.
M20 INOX machine tap – a tool for precision tapping
This model in the HSSE series, designed to produce M20 metric threads in stainless and structural steels, features a long shank according to DIN 376. The M20 INOX machine tap has a reinforced straight shank that increases rigidity when operating at high spindle speeds on machining centers. With the addition of 5% cobalt, the tool retains a hardness of 66 HRC even at temperatures up to 650°C in the cutting zone. Form C with straight flutes provides general-purpose capability. The M20 HSSE machine tap is intended for manufacturers of hydraulic and pneumatic components.
Key advantages of the M20 INOX tap
- Compatibility with ER32 holders collets and synchronized tapping chucks for CNC machining centers with automatic tool change
- Material versatility covering austenitic stainless steels 304 and 316, structural steels up to 800 MPa and nonferrous metals such as aluminum and brass
- Durability increased by the addition of cobalt in HSSE steel allows 400-600 threads to be cut in structural steel with proper emulsion cooling
- Precision to tolerance class 6H for demanding fit tolerances in series production of mechanical, hydraulic and pneumatic components
- Compliance with DIN 376 ensures standardized long-shank dimensions and interchangeability with tools from European tool manufacturers
- Universal M20 machine tap with form C allows tapping of through holes and blind holes without changing the tool or parameters
The M20 machine tap for through holes and blind holes is used in automotive series production and on assembly lines requiring high repeatability. It performs well in components requiring leak-tight connections with high load capacity. The tap drill diameter for the M20 thread is 17.5 mm for a coarse thread with a pitch of 2.5 mm.
Cutting data for the universal M20 HSSE INOX machine tap
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 80-318 | 200-795 |
| MStainless steel / INOX | 5-10 | 80-159 | 200-398 |
| KCast iron | 5-15 | 80-239 | 200-598 |
| NAluminum | 10-25 | 159-398 | 398-995 |
Thread preparation M20
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 17.5 mm
3 Tapping
M20
✓ Done!
Tolerance 6H
Standard: DIN 376 | Chamfer: C (straight) | Application: general-purpose (through and 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 M20 HSSE tap with form C and straight flutes is universal – suitable for both through holes and blind holes. Its design ensures proper chip evacuation in both hole types.
The M20 HSSE tap produces an internal thread to tolerance class 6H. The designation 6H specifies the permissible deviations of the thread pitch and minor diameters – the digit 6 indicates the tolerance zone width (medium), and the letter H indicates the position of the zone at the zero line. Tolerance 6H ensures proper fit with screws to tolerance 6g.
When tapping stainless steels, an EP emulsion at a minimum concentration of 8% or tapping oil is recommended for cooling. Cooling extends tool life by a factor of 2-3 and improves the thread surface finish.
Product accessories
HSSE 17.5 cobalt metal drill bit DIN 338
Reference: 13297 In stock > 10 items
€17.11
€21.04 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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