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Description
DIAMETER Ø8 mm
MORSE TAPER MT1
OVERALL LENGTH 156 mm
FLUTE LENGTH 75 mm
Technical specifications of the Ø8 mm drill bit
Twist drill with Morse taper shank
| TECHNICAL DATA | |
|---|---|
| Diameter | Ø8 NWKc HSSE |
| Standard | DIN 345 |
| Drill type | NWKc — twist drill with taper shank |
| Material | HSSE (cobalt high-speed steel) |
| Overall length l1 | 156 mm |
| Flute length l2 | 75 mm |
| Morse taper | MT1 |
| Point angle | 118° |
| Diameter tolerance | h8 |
| Cutting direction | Right-hand |
Ø8 mm HSSE twist drill – MT1 Morse taper
Product description and key benefits
The Ø8 mm NWKc twist drill combines two features important in everyday shop work: secure taper mounting and the ability to be resharpened repeatedly. The MT1 taper provides direct contact with the spindle — without play or slippage. With a flute length of 75 mm, the Ø8 Morse taper drill allows machining of workpieces of standard thicknesses, while the 118° point angle eliminates the need for preliminary spot drilling on flat surfaces.
Key benefits of the Ø8 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 MT1 — 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 75 mm — drilling through holes in components up to 60 mm thick
- Machining INOX steel without coatings — HSSE geometry and composition allow drilling in acid-resistant steels without TiN/TiAlN coatings
The Ø8 Morse taper drill is suitable for series production of steel components, where repeatable hole dimensions determine assembly quality. With H12 tolerance at Ø8.000–Ø8.150 mm, holes require no additional machining for bolted connections. More precise fits are achieved 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 Ø8 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 mm drill bit according to ISO 513
Recommended machining conditions for a diameter of Ø8 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 | 438÷796 | 35÷64 |
| K Cast iron | Gray cast iron GG20–GG30 | 13÷16 | 0.08 | 517÷637 | 41÷51 |
| N Copper and Al alloys | Cu, CuZn, Al, and alloys | 25÷28 | 0.10÷0.12 | 995÷1114 | 100÷134 |
Drill sharpening
Sharpen the Ø8 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 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 mm drill bit
The maximum drilling depth is the flute length l2 = 75 mm minus the drill point length (approximately 2 mm). The effective usable depth is therefore approximately 73 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.
A cooling and lubricating emulsion at a concentration of 5–8% is recommended. For stainless steels, increase the concentration to 8–10%. Cast iron can be drilled dry with compressed air to remove chips.
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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