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Description
Material HSSE
Thread size M20
ChamferB (3.5–5.5) threads
Standard DIN 376
Technical data for the M20 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 | 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 M20 x2.5 tap has a reduced shank to DIN 376: diameter 16 mm, square size 12 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 2.5 mm/rev, equal to the pitch of the M20 x2.5 thread.
M20 machine tap for through holes – cobalt HSSE with a long shank DIN 376
The M20 machine tap for through holes is a professional tool for cutting M20 internal threads in holes requiring increased clamping rigidity and high thread quality. HSSE high-speed steel with 5% cobalt provides a hardness of 65-67 HRC and high heat resistance in the cutting zone up to 650°C. M20 is among the most common large metric thread sizes used in heavy machinery manufacturing, steel structures, and the energy industry. The long shank to DIN 376 minimizes tool runout and improves thread quality when tapping large diameters in deep holes.
Advantages and applications of the M20 HSSE machine tap
- Popular M20 size widely used in heavy machinery manufacturing, steel structures, the energy industry, and series production requiring large threaded joints
- Long shank to DIN 376 provides greater clamping rigidity and improved tool guidance, which is essential when tapping M20 diameters in deep holes
- HSSE steel with 5% cobalt guarantees a hardness of 65-67 HRC and heat resistance up to 650°C, extending cutting edge life under intensive use
- The 6H tolerance to DIN 376 ensures thread precision and full interchangeability with fasteners used in heavy industry and the energy sector
- Compatibility with ER32 and ER40 tool holders and tapping heads for CNC machining centers with synchronous tapping and automatic compensation
- Metric pitch of 2.5 mm in accordance with DIN 13 for M20 coarse threads, with a recommended tap drill diameter of 17.5 mm for optimum thread engagement
The M20 machine tap for through holes is used in series production, heavy machinery manufacturing, the energy industry, and maintenance departments for repairing and restoring threads in large components. Form B with straight flutes provides effective forward chip evacuation. The tool requires cooling with an oil emulsion at a minimum concentration of 8-10% to maintain optimum tool life.
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 80-318 | 200-795 |
| MStainless steel | 5-10 | 80-159 | 200-398 |
| KCast iron | 5-15 | 80-239 | 200-598 |
| NAluminum | 10-25 | 159-398 | 398-995 |
Thread preparation M20 in a through hole
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 17.5 mm
3 Tapping
M20
✓ 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
The M20 HSSE tap performs well in structural steels up to 800 MPa, alloy steels, austenitic stainless steels 304/316, gray and ductile cast iron, aluminum, and brass.
The recommended tap drill diameter for the M20 coarse thread is 17.5 mm. Accurate hole preparation ensures a full thread profile and minimizes the load on the tap.
With proper cooling, the M20 HSSE tap cuts 250-400 threads in structural steel and 100-200 threads in stainless steel. Dry operation reduces tool life by 30-40%.
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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| 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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