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Description
Material HSSE
Thread size M56
ChamferC (2–3) threads
Standard DIN 376
Technical data for the M56 HSSE INOX general-purpose machine tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M56 |
| Thread Pitch P | 5.5 mm |
| Overall Length l1 | 280 mm |
| Flute Length l2 | 90 mm |
| Shank Diameter d2 | 45 mm |
| Square Drive Size a | 35 mm |
| Tap Drill Diameter | 50.5 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 M56 x5.5 tap has a reduced shank to DIN 376: diameter 45 mm, square size 35 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 5.5 mm/rev, equal to the pitch of the M56 x5.5 thread.
M56 INOX machine tap – HSSE for stainless steel
In this line, manufacturer Fra offers the M56 INOX machine tap with a long shank according to DIN 376 and optimized cutting geometry for metric threads of the largest diameter in the range. The tool meets DIN 376 requirements and provides the 6H thread tolerance class required in series production of mechanical and precision components. Its HSSE steel construction with 5% cobalt guarantees a hardness of 66 HRC and resistance to temperatures up to 650°C in the cutting zone. Form C with straight flutes provides versatility for through and blind holes in stainless steels.
Advantages of the M56 general-purpose tap
- Long shank to DIN 376 provides maximum clamping rigidity and eliminates vibration at the high cutting torques typical of the largest diameters
- Durability increased by the addition of cobalt in HSSE steel extends cutting edge life by 40-60% compared with standard HSS taps
- Material versatility covering austenitic stainless steels 304 and 316, structural steels up to 800 MPa and nonferrous metals such as aluminum and brass
- Precision to tolerance class 6H meeting the requirements of series production of mechanical and pneumatic components with tight fit tolerances
- Conforms to DIN 376 ensures standardized long shank dimensions and interchangeability with tools from European cutting tool manufacturers
- M56 HSSE machine tap with form C ensures proper chip evacuation in through holes and blind holes without the risk of jamming
The Fra M56 general-purpose machine tap is used in steel structures, hydraulic power systems, and the manufacture of industrial valve and fitting components. The M56 machine tap for through and blind holes is compatible with ER40 holders. The tap drill diameter for the M56 thread is 50.5 mm for a coarse thread with a pitch of 5.5 mm.
Cutting data for the universal M56 HSSE INOX machine tap
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 28-114 | 154-627 |
| MStainless steel / INOX | 5-10 | 28-57 | 154-314 |
| KCast iron | 5-15 | 28-85 | 154-468 |
| NAluminum | 10-25 | 57-142 | 314-781 |
Thread preparation M56
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 50.5 mm
3 Tapping
M56
✓ 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 M56 HSSE tap is suitable for austenitic stainless steels 304 and 316, structural steels up to 800 MPa, ductile cast iron, and aluminum and brass alloys. It is not recommended for hardened steels above 45 HRC.
The nominal tap drill diameter for the M56 thread is 50.5 mm. The hole tolerance zone should be within the range of 50.4–50.6 mm. A hole at the lower tolerance limit produces a fuller thread profile, while a hole at the upper limit reduces tapping torque.
The M56 tap works with ER40 holders and tapping chucks with axial compensation. Synchronized heads with automatic tool change capability are recommended for CNC machines.
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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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