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Description
Material HSSE
Thread size M33
ChamferB (3.5–5.5) threads
Standard DIN 376
Technical data for the M33 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 | 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 M33 x3.5 tap has a reduced shank to DIN 376: diameter 25 mm, square size 20 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 3.5 mm/rev, equal to the pitch of the M33 x3.5 thread.
M33 machine tap for through holes – Fra HSSE with DIN 376 long shank
Fra offers the M33 machine tap for through holes, made from HSSE high-speed steel with 5% added cobalt for machine building and special-purpose structures. The long shank in accordance with DIN 376 provides increased clamping rigidity and better tool guidance when tapping the nonstandard M33 diameter. The 6H tolerance guarantees dimensional repeatability. The M33 diameter is a special size used in applications where standard M32 or M36 sizes do not meet the requirements.
Key benefits of the Fra M33 machine tap
- Manufacturer Fra as a specialist in special-purpose taps, guarantees high manufacturing quality and accurate nonstandard thread geometry
- Nonstandard M33 size used in specialized industrial applications requiring an intermediate diameter between M32 and M36
- Long shank to DIN 376 provides greater clamping rigidity and better tool guidance, which is essential when tapping large diameters
- HSSE steel with 5% cobalt guarantees a hardness of 65-67 HRC and heat resistance up to 650°C, extending cutting edge life
- Tolerance 6H according to DIN 376 ensures precise thread production and full interchangeability with fasteners
- Metric pitch of 3.5 mm compliant with DIN 13 for M33 coarse threads, the recommended tap drill diameter is 29.5 mm
The Fra M33 machine tap is used in specialized machinery designs and heavy industry where a nonstandard diameter is required. Form B with straight flutes directs chips forward when tapping through holes. Cooling with an oil emulsion at a concentration of 8-10% is recommended.
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 48-193 | 168-676 |
| MStainless steel | 5-10 | 48-96 | 168-336 |
| KCast iron | 5-15 | 48-145 | 168-508 |
| NAluminum | 10-25 | 96-241 | 336-844 |
Thread preparation M33 in a through hole
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 29.5 mm
3 Tapping
M33
✓ 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 M33 thread is used in specialized industrial applications where standard M32 or M36 sizes do not meet design requirements for diameter or load capacity.
The recommended tap drill diameter for the M33 coarse thread is 29.5 mm. Accurate hole machining ensures a full thread profile.
M33 is a nonstandard size, and fasteners may require a special order. Checking availability with industrial suppliers in advance is recommended.
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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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