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Description
DIAMETER Ø33 mm
MORSE TAPER MT4
OVERALL LENGTH 334 mm
FLUTE LENGTH 185 mm
Technical specifications of the Ø33 mm drill bit
Twist drill with Morse taper shank
| TECHNICAL DATA | |
|---|---|
| Diameter | Ø33 NWKc HSSE |
| Standard | DIN 345 |
| Drill type | NWKc — twist drill with taper shank |
| Material | HSSE (cobalt high-speed steel) |
| Overall length l1 | 334 mm |
| Flute length l2 | 185 mm |
| Morse taper | MT4 |
| Point angle | 118° |
| Diameter tolerance | h8 |
| Cutting direction | Right-hand |
Ø33 mm HSSE twist drill – MT4 Morse taper
Product description and key benefits
The Ø33 mm NWKc metal drill bit with an MT4 Morse taper falls within the range where the volume of material removed per centimeter of depth requires particular attention to chip evacuation and cooling. The MT4 taper transmits the torque generated at diameters of 32–50 mm without the risk of slippage. The Ø33 Morse taper drill bit with a flute length of 185 mm enables through drilling in components with thicknesses encountered in heavy machinery manufacturing.
Key benefits of the Ø33 mm metal drill bit
- HSSE steel with 5% cobalt — heat resistance up to 650°C allows drilling in 304/316 stainless steels without rapid dulling of the cutting edge
- Morse taper MT4 — self-holding mounting in the spindle eliminates slippage at the high cutting torques generated in difficult-to-machine steels
- Increased hot hardness — cobalt in the steel matrix increases resistance to tempering — essential at low Vc and the high cutting resistance of austenitic steels
- DIN 345 — full interchangeability with HSS drills of the same size and compatibility with reduction sleeves
- Flute length 185 mm — drilling through holes in components up to 170 mm thick
- Machining INOX steel without coatings — HSSE geometry and composition allow drilling in acid-resistant steels without TiN/TiAlN coatings
The Ø33 mm drill bit is used in steel fabrication plants, maintenance departments, and industrial machinery service shops. It is suitable for drilling mounting holes in foundation plates, pipeline flanges, and machine housings. It normally produces holes to tolerance grade H12 (Ø33.000–Ø33.250 mm); holes requiring an H7 fit need additional reaming.
Morse tapers – dimensions to DIN 228
Dimension table for all Morse tapers MT0–MT6
| Taper | Diameter D [mm] | Length [mm] |
|---|---|---|
| MT0 | 9.045 | 49.8 |
| MT1 | 12.065 | 53.5 |
| MT2 | 17.780 | 64.0 |
| MT3 | 23.825 | 80.5 |
| MT4 | 31.267 | 117.5 |
| MT5 | 44.399 | 149.5 |
| MT6 | 63.348 | 210.0 |
REDUCTION SLEEVES COMPATIBLE WITH THE Ø33 MM DRILL BIT:
| ✓ | MT4 → MT5 — for a spindle with an MT5 socket |
| ✓ | MT4 → MT3 — for a spindle with an MT3 socket |
| ✓ | MT4 drill drift — for removing the drill bit from the spindle |
Cutting data for the Ø33 mm drill bit according to ISO 513
Recommended machining conditions for a diameter of Ø33 mm
| ISO symbol | Workpiece material | Vc [m/min] | f [mm/rev] | n [rpm] | Vf [mm/min] |
|---|---|---|---|---|---|
| P Steel | Structural steel up to 900 N/mm² | 11÷20 | 0.25 | 106÷193 | 26÷48 |
| K Cast iron | Gray cast iron GG20–GG30 | 13÷16 | 0.25 | 125÷154 | 31÷38 |
| N Copper and Al alloys | Cu, CuZn, Al, and alloys | 25÷28 | 0.32÷0.40 | 241÷270 | 77÷108 |
Minimum machine tool power
The Ø33 mm drill requires a drilling machine with at least 2.2 kW of power and power spindle feed. Stability is difficult to maintain with manual feed — uneven pressure leads to vibration and accelerated cutting edge wear. A box-column or radial drilling machine is recommended.
Material compatibility of the Ø33 mm drill bit
Range of workpiece materials and application limitations
✓ Structural steel (S235, S355) up to 900 N/mm²
✓ Gray and ductile cast iron (GG20, GGG40)
✓ Low-carbon and medium-alloy steel
▲ Stainless steel (Vc reduced by 30%, ample coolant)
▲ Aluminum and Al alloys (emulsion coolant required)
✗ Hardened steels above 45 HRC
Frequently asked questions about the Ø33 mm drill bit
For a drilling machine with an MT5 spindle: MT4→MT5 sleeve. For a smaller MT3 spindle: MT4→MT3 sleeve (check that the operating load does not exceed the socket capacity). For removal: MT4 drill drift.
Depth greater than 3×D (99 mm): reduce feed by 30–50%, retract every 1×D, and use a 6–8% emulsion at a minimum flow rate of 6 l/min. Peck drilling prevents chips from jamming in the flutes.
1) Clean the taper and spindle socket. 2) Check runout (maximum 0.03 mm). 3) Replace the drill if the taper is damaged or worn. 4) Do not stack reduction sleeves (e.g., MT4→MT3→MT5).
Product accessories
Reduction sleeve MK6 MK4 1751 PTPa DIN 228
Reference: 1186 In stock < 10 items
€36.84
€45.32 brutto
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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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