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Description
DIAMETER Ø17.5 mm
MORSE TAPER MT2
OVERALL LENGTH 228 mm
FLUTE LENGTH 130 mm
Technical specifications of the Ø17.5 mm drill bit
Twist drill with Morse taper shank
| TECHNICAL DATA | |
|---|---|
| Diameter | Ø17.5 NWKc HSSE |
| Standard | DIN 345 |
| Drill type | NWKc — twist drill with taper shank |
| Material | HSSE (cobalt high-speed steel) |
| Overall length l1 | 228 mm |
| Flute length l2 | 130 mm |
| Morse taper | MT2 |
| Point angle | 118° |
| Diameter tolerance | h8 |
| Cutting direction | Right-hand |
Ø17.5 mm HSSE twist drill – MT2 Morse taper
Product description and key benefits
The Ø17.5 mm twist drill with an MT2 taper shank conforming to DIN 345 is used on pillar and box-column drilling machines in metalworking shops, toolrooms, and maintenance departments. The 17.5 mm diameter falls within the MT2 taper range, the most common size in shop drilling machines rated at 0.75–1.5 kW. The Ø17.5 Morse taper drill with right-hand helical flute geometry evacuates chips from the cutting zone even when drilling deep holes.
Key benefits of the Ø17.5 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 MT2 — 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 130 mm — drilling through holes in components up to 115 mm thick
- Machining INOX steel without coatings — HSSE geometry and composition allow drilling in acid-resistant steels without TiN/TiAlN coatings
The Ø17.5 Morse taper drill is suitable for drilling holes in hollow sections, medium-thickness sheet metal, and components used in machinery repairs. H12 tolerance (Ø17.500–Ø17.680 mm) is sufficient for assembly holes; if H7 tolerance is required, additional reaming is necessary.
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 Ø17.5 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 Ø17.5 mm drill bit according to ISO 513
Recommended machining conditions for a diameter of Ø17.5 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 | 0.16 | 200÷364 | 32÷58 |
| K Cast iron | Gray cast iron GG20–GG30 | 13÷16 | 0.16 | 236÷291 | 38÷47 |
| N Copper and Al alloys | Cu, CuZn, Al, and alloys | 25÷28 | 0.20÷0.25 | 455÷509 | 91÷127 |
Deep-hole drilling (over 3×D)
When drilling holes deeper than 52 mm (3×Ø17.5), periodically retract the drill every 1–1.5×D to remove chips. Use ample emulsion cooling (minimum concentration of 6–8%). Reduce the feed by 30–50% from nominal values.
Material compatibility of the Ø17.5 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 Ø17.5 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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