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Description
Material HSSE
Thread size M20
ChamferB (3.5–5.5) threads
Standard DIN 376
Technical data for the M20 left-hand machine tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M20 |
| Thread Pitch P | 2.5 mm |
| Overall Length l1 | 140 mm |
| Flute Length l2 | 32 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 counterclockwise – this is how it cuts a left-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 left-hand machine tap for through holes – cobalt HSSE with a long shank
The manufacturer offers the M20 left-hand machine tap for through holes, made of HSSE high-speed steel with 5% cobalt, for applications in components that rotate clockwise during normal operation. A left-hand thread is essential in applications where a right-hand thread could loosen under the torque of large mechanical components. The long shank according to DIN 376 provides increased clamping rigidity and better tool guidance when tapping large M20 diameters in deep holes. The tool is intended for professional toolrooms handling special orders and manufacturers of rotating components.
Main advantages of the M20 left-hand machine tap
- Left-hand thread direction (LH) used in drive shafts, spindles, and large components that rotate clockwise, where a right-hand thread could loosen
- Popular M20 size in a left-hand version for applications in heavy machinery manufacturing, the power industry, and structures requiring protection against self-loosening
- Long shank to DIN 376 provides greater clamping rigidity and better tool guidance when tapping large 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
- Compatibility with ER32 and ER40 tool holders and tapping heads with reversible rotation for cutting left-hand threads on CNC centers
- Metric pitch of 2.5 mm in accordance with DIN 13, with a recommended tap drill diameter of 17.5 mm, identical to that for the M20 right-hand thread with the same pitch
The M20 left-hand machine tap is used in drive shafts, spindles, large rotating machine components, and wherever a component rotates clockwise during normal operation. Form B with straight flutes directs chips forward when tapping through holes. Cooling with an oil emulsion at a concentration of 8-10% is recommended 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 left-hand thread is used in drive shafts, spindles, large rotating machine components, and wherever a component rotates clockwise and a right-hand thread could loosen.
The recommended tap drill diameter for the M20 left-hand thread is 17.5 mm — identical to that for the right-hand thread. Thread direction does not affect the tap drill diameter.
Yes, the M20 left-hand thread requires bolts and nuts with a left-hand thread. These components are available from industrial suppliers, but the thread direction must be specified when ordering.
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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