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Description
DIAMETER Ø8.8 mm
MORSE TAPER MT1
OVERALL LENGTH 162 mm
FLUTE LENGTH 81 mm
Technical specifications of the Ø8.8 mm drill bit
Twist drill with Morse taper shank
| TECHNICAL DATA | |
|---|---|
| Diameter | Ø8.8 NWKc HSSE |
| Standard | DIN 345 |
| Drill type | NWKc — twist drill with taper shank |
| Material | HSSE (cobalt high-speed steel) |
| Overall length l1 | 162 mm |
| Flute length l2 | 81 mm |
| Morse taper | MT1 |
| Point angle | 118° |
| Diameter tolerance | h8 |
| Cutting direction | Right-hand |
Ø8.8 mm HSSE twist drill – MT1 Morse taper
Product description and key benefits
The Ø8.8 mm twist drill with an MT1 Morse taper is an alternative to straight-shank drills wherever a drill chuck does not provide sufficient clamping rigidity. Direct mounting in the spindle of a pillar drilling machine eliminates the intermediate link — the chuck — which can become a source of runout and slippage during intensive use. The Ø8.8 Morse taper drill is particularly suitable for metalworking shops and toolrooms, where hole position accuracy matters when fitting pins and bushings.
Key benefits of the Ø8.8 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
- MT1 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 81 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 Ø8.8 Morse taper drill bit is most often selected for mounting holes in hollow sections, thick plates, and machine components. In toolrooms, it is used to prepare preliminary holes before reaming to a dowel pin fit. Holes are produced to tolerance class H12 (Ø8.800–Ø8.950 mm); if class H7 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 Ø8.8 MM DRILL BIT:
| ✓ | MT1 → MT2 — for a spindle with an MT2 socket |
| ✓ | MT1 → MT3 — for a spindle with an MT3 socket |
| ✓ | MT1 drill drift — for removing the drill bit from the spindle |
Cutting data for the Ø8.8 mm drill bit according to ISO 513
Recommended machining conditions for a diameter of Ø8.8 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 | 0.08 | 398÷723 | 32÷58 |
| K Cast iron | Gray cast iron GG20–GG30 | 13÷16 | 0.08 | 470÷579 | 38÷46 |
| N Copper and Al alloys | Cu, CuZn, Al, and alloys | 25÷28 | 0.10÷0.12 | 904÷1013 | 90÷122 |
Drill sharpening
Sharpen the Ø8.8 mm drill bit on a tool grinder, maintaining the 118° point angle and cutting edge symmetry. Asymmetric sharpening enlarges the hole diameter and loads the spindle unevenly. Each sharpening reduces the flute length by approximately 1–2 mm.
Material compatibility of the Ø8.8 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 Ø8.8 mm drill bit
Yes — using an MT1→MT2 reduction sleeve. The sleeve ensures proper seating of the taper in the larger spindle socket. Use a correctly sized drill drift for removal.
The maximum drilling depth is the flute length l2 = 81 mm minus the drill point length (approximately 3 mm). The effective usable depth is therefore approximately 78 mm.
In S235/S355 structural steels, spot drilling is not necessary — the 118° angle provides self-centering. Spot drilling with an NC 90° drill is recommended when drilling on milled surfaces, castings with machining allowance, or difficult-to-machine materials.
Product accessories
Reduction sleeve MK4 MK1 1751 PTPa DIN 228
Reference: 1179 In stock > 10 items
€15.79
€19.42 brutto
Reduction sleeve MK3 MK1 1751 PTPa DIN 228
Reference: 1184 In stock > 10 items
€11.84
€14.57 brutto
Reduction sleeve MK5 MK1 1751 PTPa DIN 228
Reference: 1185 In stock > 10 items
€22.37
€27.51 brutto
Reduction sleeve MK2 MK1 1751 PTPa DIN 228
Reference: 2586 In stock < 10 items
€9.21
€11.33 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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