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Machine tap M33x2 DIN 374/35 C HSSE Fra
0000008369
€110.05 tax inc.
Net price: €89.47
Description
Material HSSE
Thread size M33x2
ChamferC (2–3) threads
Standard DIN 374
Technical data for the M33x2 blind hole tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M33x2 |
| Thread Pitch P | 2 mm |
| Helix Angle | 35° |
| Overall Length l1 | 160 mm |
| Flute Length l2 | 30 mm |
| Length l3 | 62 mm |
| Shank Diameter d2 | 25 mm |
| Square Drive Size a | 20 mm |
| Tap Drill Diameter | 31 mm |
| Chamfer | C (2÷3) P |
| Thread tolerance | 6H |
How a spiral flute tap evacuates chips from a blind hole
The 35° flute works like a screw conveyor
The flutes of this tap follow a right-hand helix at an angle of 35° to the axis. The tap rotates clockwise and advances into the hole. Chips cut by the chamfer enter the flute, and the helix carries them upward like the auger in a meat grinder. The bottom of the hole stays clear, and the cutting edges do not encounter packed chips. The M33x2 tap has a reduced shank to DIN 374: diameter 25 mm, square drive 20 mm.
1
The 35° spiral flute carries chips upward from the chamfer.
2
The stepped chip exits the hole and breaks into short pieces.
3
The tap rotates clockwise to cut a right-hand thread.
4
Chamfer C: 2–3 incomplete threads on the tapered lead.
5
Clearance below the tap tip – min. 2 thread pitches above the bottom.
6
Feed 2 mm/rev, equal to the pitch of the M33x2 thread.
M33x2 spiral flute machine tap – for metric fine threads
Fra's series of metric fine thread taps designed for steel structures includes the M33x2 spiral flute machine tap with an intermediate pitch of 2 mm. The 6H tolerance in accordance with DIN 374 guarantees the dimensional repeatability required in series production of mechanical components. HSSE steel construction with 5% added cobalt provides a hardness of 65-67 HRC and thermal resistance up to 650°C in the cutting zone. The 35° spiral flute directs chips backward when tapping blind holes in machine housings.
Why choose the M33x2 spiral flute machine tap
- Compliance with DIN 374 for metric fine threads ensures standardized dimensions and full interchangeability with tools from European manufacturers
- Designed for steel structures includes welded components, machine frames, load-bearing structures, and bolted connections with increased strength
- Tolerance class 6H precision guarantees full thread interchangeability and dimensional repeatability in high-volume production of mechanical components
- Durability of HSSE steel with 5% cobalt allows operation at temperatures up to 650°C without loss of the cutting edge's mechanical properties
- Form C chamfer for blind holes allows tapping close to the bottom of the hole with a minimal incomplete thread length of 2-3 pitches
- Compatibility with ER40 holders and tapping chucks with axial compensation for CNC machining centers and automatic lathes
The M33x2 spiral flute tap is used in steel structure fabrication and industrial welding applications requiring threaded connections with increased strength. The fine pitch of 2 mm provides a larger contact area than the standard M33x3.5 thread. The tap drill diameter for the M33x2 thread is 31 mm according to metric fine thread tables.
Cutting data for the M33x2 blind hole machine tap
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 48-193 | 96-386 |
| MStainless steel | 5-10 | 48-96 | 96-192 |
| KCast iron | 5-15 | 48-145 | 96-290 |
| NAluminum | 10-25 | 96-241 | 192-482 |
Thread preparation M33x2 in a blind hole
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 31 mm
3 Tapping
M33x2
✓ Done!
Tolerance 6H
Standard: DIN 374 | Chamfer: C (spiral flute) | Application: 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 M33x2 HSSE metric fine machine tap is suitable for structural steels up to 900 MPa, stainless steels, aluminum, and brass. The intermediate pitch of 2 mm is used in steel structures requiring connections with increased strength.
For the M33x2 metric fine thread in tolerance class 6H, the recommended tap drill diameter is 31 mm. The hole tolerance zone should fall within the range of 31.0 to 31.2 mm. Exceeding the upper limit results in an incomplete thread profile.
Yes, cooling with an oil emulsion at a minimum concentration of 8% or with tapping oil is recommended and extends tool life by a factor of 2-3. Intensive cooling under pressure is required when machining stainless steels.
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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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