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Description
Material HSSE
Thread size M56
ChamferB (3.5–5.5) threads
Standard DIN 376
Technical data for the M56 machine tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M56 |
| Thread Pitch P | 5.5 mm |
| Overall Length l1 | 180 mm |
| Flute Length l2 | 70 mm |
| Shank Diameter d2 | 40 mm |
| Square Drive Size a | 32 mm |
| Tap Drill Diameter | 50.5 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 M56 x5.5 tap has a reduced shank to DIN 376: diameter 40 mm, square size 32 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 5.5 mm/rev, equal to the pitch of the M56 x5.5 thread.
M56 machine tap for through holes – cobalt HSSE with a long shank DIN 376
The HSSE-series M56 machine tap for through holes is designed for cutting internal M56 threads in through holes on CNC machine tools and conventional machines. The long shank in accordance with DIN 376 provides increased clamping rigidity and improved tool guidance when tapping very large diameters. High-speed steel construction with 5% added cobalt provides a hardness of 65-67 HRC and high heat resistance in the cutting zone up to 650°C.
Key features of the M56 machine tap for through holes
- Very large M56 diameter used in heavy industry, the energy sector, construction machinery, and steel structures of the largest dimensions
- Long shank to DIN 376 provides greater clamping rigidity and improved tool guidance, which is essential when tapping M56 diameters
- HSSE steel with 5% cobalt guarantees a hardness of 65-67 HRC and heat resistance up to 650°C, extending cutting edge life
- The 6H tolerance to DIN 376 ensures thread precision and full interchangeability with standard-class fasteners
- Compatibility with ER40 holders and specialized tapping chucks for CNC machining centers
- Metric pitch of 5.5 mm in accordance with DIN 13 for M56 coarse threads, with a recommended tap drill diameter of 50.5 mm
The M56 machine tap for through holes is used in the production of structural components of the largest dimensions, heavy machinery manufacturing, and the energy industry. Form B with straight flutes ensures efficient chip evacuation. The tool requires cooling with an oil emulsion at a minimum concentration of 8-10%.
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 28-114 | 154-627 |
| MStainless steel | 5-10 | 28-57 | 154-314 |
| KCast iron | 5-15 | 28-85 | 154-468 |
| NAluminum | 10-25 | 57-142 | 314-781 |
Thread preparation M56 in a through hole
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 50.5 mm
3 Tapping
M56
✓ 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 M56 HSSE tap performs well in structural steels up to 800 MPa, alloy steels, stainless steels, gray cast iron, and ductile iron. The addition of 5% cobalt increases heat resistance.
The recommended tap drill diameter for the M56 coarse thread is 50.5 mm. Accurate hole preparation ensures a full thread profile and minimizes the load on the tap.
The M56 DIN 376 tap with long shank works with ER40 holders and specialized tapping chucks for large diameters. The long shank requires holders with an appropriate clamping depth.
Product accessories
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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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