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Description
Material HSSE
Thread size M33
ChamferC (2–3) threads
Standard DIN 376
Technical data for the M33 HSSE INOX general-purpose machine tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M33 |
| Thread Pitch P | 3.5 mm |
| Overall Length l1 | 180 mm |
| Flute Length l2 | 50 mm |
| Shank Diameter d2 | 25 mm |
| Square Drive Size a | 20 mm |
| Tap Drill Diameter | 29.5 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 M33 x3.5 tap has a reduced shank to DIN 376: diameter 25 mm, square size 20 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 3.5 mm/rev, equal to the pitch of the M33 x3.5 thread.
M33 INOX machine tap – HSSE for stainless steel
In this product line, Fra offers the M33 INOX machine tap with optimized cutting geometry for metric threads with a diameter of 33 mm. The tool meets DIN 376 requirements and provides thread tolerance class 6H required in series production of mechanical and precision components. HSSE steel construction with 5% cobalt ensures a hardness of 66 HRC and resistance to temperatures up to 650°C in the cutting zone. Form C with straight flutes provides versatile use in through and blind holes in stainless steels.
Advantages of the M33 general-purpose tap for through and blind holes
- Compatibility with ER40 holders collets and synchronized tapping chucks for CNC machining centers with automatic tool change
- 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
- M33 HSSE machine tap with form C ensures proper chip evacuation in through holes and blind holes without the risk of jamming
The Fra M33 general-purpose machine tap is used in steel structures, hydraulic power systems and the production of industrial automation components. The M33 machine tap for through and blind holes is compatible with automatic tool changing systems. The tap drill diameter for the M33 thread is 29.5 mm for a coarse thread with a pitch of 3.5 mm.
Cutting data for the universal M33 HSSE INOX machine tap
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 48-193 | 168-676 |
| MStainless steel / INOX | 5-10 | 48-96 | 168-336 |
| KCast iron | 5-15 | 48-145 | 168-508 |
| NAluminum | 10-25 | 96-241 | 336-844 |
Thread preparation M33
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 29.5 mm
3 Tapping
M33
✓ 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
With proper cooling and lubrication, the M33 HSSE tap produces 400-600 threads in structural steel or 250-350 threads in stainless steel. Dry machining reduces tool life by 40-50%.
Yes, the M33 HSSE tap with 5% cobalt is designed for austenitic stainless steels 304 and 316. The cobalt addition increases heat resistance up to 650°C in the cutting zone.
An HSSE tap contains 5% cobalt, which increases hardness from 64 to 66 HRC and heat resistance to 650°C. HSSE is suitable for stainless steels, while HSS is suitable only for structural steels up to 800 MPa.
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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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