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Description
DIAMETER Ø22.5 mm
MORSE TAPER MT2
OVERALL LENGTH 253 mm
FLUTE LENGTH 155 mm
Technical specifications of the Ø22.5 mm drill bit
Twist drill with Morse taper shank
| TECHNICAL DATA | |
|---|---|
| Diameter | Ø22.5 NWKc HSSE |
| Standard | DIN 345 |
| Drill type | NWKc — twist drill with taper shank |
| Material | HSSE (cobalt high-speed steel) |
| Overall length l1 | 253 mm |
| Flute length l2 | 155 mm |
| Morse taper | MT2 |
| Point angle | 118° |
| Diameter tolerance | h8 |
| Cutting direction | Right-hand |
Ø22.5 mm HSSE twist drill – MT2 Morse taper
Product description and key benefits
The Ø22.5 mm NWKc twist drill with an MT2 taper is standard equipment for pillar drilling machines in metalworking shops and toolrooms. The 22.5 mm diameter falls within the range where the MT2 taper provides an optimal ratio of contact area to operating load. The Ø22.5 Morse taper drill with type N flute geometry balances efficient chip evacuation with drill web rigidity.
Key benefits of the Ø22.5 mm metal drill bit
- Cobalt 5% — hardness up to 67 HRC — greater hardness than standard HSS (63–65 HRC) translates into longer service life between sharpenings
- MT2 Morse taper to DIN 345 — secure, self-holding mounting regardless of load level
- Cutting-edge stability in INOX steels — HSSE does not require as drastic a reduction in Vc as HSS when drilling acid-resistant steels
- Flute length 155 mm — allows drilling through standard structural component thicknesses
- Versatility — drilling structural steels, stainless steels, cast iron, and aluminum with one tool
- 118° angle — self-centering in most materials without spot drilling
The Ø22.5 Morse taper drill is used in structural steel fabrication plants, toolrooms, and machinery service shops. Typical applications include mounting holes for bolts, pins, and bushings in steel flanges, plates, and sections. Hole tolerance class H12 (Ø22.500–Ø22.710 mm); H7 fits require reaming with a finishing reamer.
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 Ø22.5 MM DRILL BIT:
| ✓ | MT2 → MT3 — for a spindle with an MT3 socket |
| ✓ | MT2 → MT4 — for a spindle with an MT4 socket |
| ✓ | MT2 drill drift — for removing the drill bit from the spindle |
Cutting data for the Ø22.5 mm drill bit according to ISO 513
Recommended machining conditions for a diameter of Ø22.5 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 | 0.20 | 156÷283 | 31÷57 |
| K Cast iron | Gray cast iron GG20–GG30 | 13÷16 | 0.20 | 184÷226 | 37÷45 |
| N Copper and Al alloys | Cu, CuZn, Al, and alloys | 25÷28 | 0.25÷0.32 | 354÷396 | 88÷127 |
Coolant selection when drilling diameters of 22.5
At a diameter of 22.5 mm, the volume of chips removed increases significantly — the helical flutes must evacuate more material per centimeter of depth. Use an emulsion with a concentration of 6–8% at a minimum delivery rate of 3 l/min. Without pressurized cooling, limit the depth of each pass to 67 mm.
Material compatibility of the Ø22.5 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 Ø22.5 mm drill bit
Use cooling with a 5–8% emulsion, do not exceed the recommended cutting parameters, and resharpen the tool before it becomes completely dull. Clean taper and spindle socket surfaces reduce runout — the main cause of accelerated wear.
In S235/S355 structural steels, spot drilling is not necessary — the 118° angle provides self-centering. Spotting with a 90° NC spotting drill is recommended when drilling on uneven or inclined surfaces, where the drill may slip away from the marked point.
The HSS drill can be used for stainless steel with Vc reduced by 40% and ample cooling with a 8–10% emulsion. An HSSE (cobalt) drill of the same diameter is a more efficient option, retaining its hardness up to 650°C.
Product accessories
Long reduction sleeve MK1-2 PTPb 1762
Reference: 0000006908 In stock > 10 items
€15.79
€19.42 brutto
Reduction sleeve MK4 MK2 1751 PTPa DIN 228
Reference: 1181 In stock > 10 items
€15.79
€19.42 brutto
Reduction sleeve MK5 MK2 1751 PTPa DIN 228
Reference: 4910 In stock > 10 items
€22.37
€27.51 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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