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Description
Material HSSE
Thread size M40
ChamferC (2–3) threads
Standard DIN 376
Technical data for the M40 HSSE INOX general-purpose machine tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M40 |
| Thread Pitch P | 4 mm |
| Overall Length l1 | 200 mm |
| Flute Length l2 | 65 mm |
| Shank Diameter d2 | 32 mm |
| Square Drive Size a | 24 mm |
| Tap Drill Diameter | 36 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 M40 x4 tap has a reduced shank to DIN 376: diameter 32 mm, square size 24 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 4 mm/rev, equal to the pitch of the M40 x4 thread.
M40 INOX machine tap – HSSE for stainless steel
In this line, manufacturer Fra offers the M40 INOX machine tap with optimized cutting geometry for metric threads with a diameter of 40 mm and a long shank according to DIN 376. 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 M40 general-purpose tap
- Long shank to DIN 376 provides increased clamping rigidity and eliminates vibration at the high cutting torques typical of large 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
- M40 HSSE machine tap with form C ensures proper chip evacuation in through holes and blind holes without the risk of jamming
The Fra M40 general-purpose machine tap is used in steel structures, hydraulic power systems, and the manufacture of industrial automation components. The M40 machine tap for through and blind holes is compatible with ER40 holders. The tap drill diameter for the M40 thread is 36 mm for a coarse thread with a pitch of 4 mm.
Cutting data for the universal M40 HSSE INOX machine tap
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 40-159 | 160-636 |
| MStainless steel / INOX | 5-10 | 40-80 | 160-320 |
| KCast iron | 5-15 | 40-119 | 160-476 |
| NAluminum | 10-25 | 80-199 | 320-796 |
Thread preparation M40
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 36 mm
3 Tapping
M40
✓ 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 M40 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 M40 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.
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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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