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Metal drill bit 78 NWKc HSS DIN 345
11606
Diameter (mm): 78301 sizes of this drill
33,13,23,33,43,53,63,73,83,944,14,24,34,44,54,64,74,84,955,15,25,35,45,55,65,75,85,966,16,26,36,46,56,66,76,86,977,17,157,27,257,37,47,57,67,77,757,87,988,18,28,258,38,48,58,68,78,88,999,19,29,259,39,49,59,69,79,759,89,91010,110,210,310,410,510,610,710,7510,810,91111,111,211,2511,311,411,511,611,711,811,91212,112,212,312,412,512,612,712,812,91313,113,213,2513,313,413,513,613,713,7513,813,91414,2514,414,514,751515,2515,515,751616,2516,516,751717,2517,517,751818,2518,518,751919,2519,519,752020,2520,520,752121,2521,521,752222,2522,522,752323,2523,523,752424,2524,524,752525,2525,525,752626,2526,526,752727,2527,527,752828,2528,528,752929,2529,529,753030,2530,530,753131,2531,531,753232,2532,532,753333,2533,533,753434,2534,534,753535,2535,535,753636,2536,536,753737,2537,537,7537,83838,538,753939,2539,539,754040,2540,54141,54242,54343,54444,54545,54646,546,75474848,54949,55050,55151,55252,553545556575858,55960616263646566676869707172737475767778798081828384858687888990919293949596979899100
€404.61 tax inc.
Net price: €328.95
Description
DIAMETER Ø78 mm
MORSE TAPER MT6
OVERALL LENGTH 514 mm
FLUTE LENGTH 270 mm
Technical specifications of the Ø78 mm drill bit
Twist drill with Morse taper shank
| TECHNICAL DATA | |
|---|---|
| Diameter | Ø78 NWKc HSS |
| Standard | DIN 345 |
| Drill type | NWKc — twist drill with taper shank |
| Material | HSS (high-speed steel) |
| Overall length l1 | 514 mm |
| Flute length l2 | 270 mm |
| Morse taper | MT6 |
| Point angle | 118° |
| Diameter tolerance | h8 |
| Cutting direction | Right-hand |
Ø78 mm HSS metal drill bit – Morse taper MT6
Product description and key benefits
The Ø78 mm metal drill bit with an MT6 Morse taper is a tool at the upper end of the diameter range — the MT6 taper with a diameter of 63.35 mm is the largest standard size in the Morse taper system. At Ø78, cutting forces require a heavy-duty machine tool: a radial drilling machine or boring machine with a power rating above 7 kW. The Ø78 Morse taper drill bit should not be used without a pilot hole — at this diameter, the chisel edge generates an axial force exceeding 20 kN.
Key benefits of the Ø78 mm metal drill bit
- Self-holding taper shank — MT6 transmits full torque to the cutting edges without intermediate components
- HSS with a hardness of 63–65 HRC — stable cutting of materials with tensile strengths up to 900 N/mm² without loss of sharpness
- Overall length of 514 mm — proportional to the drilling diameter — provides a balance between reach and rigidity
- General-purpose 118° geometry — suitable for most materials encountered in shop machining
- Sleeve compatibility — use on drilling machines with MT5 to MT6 spindles using reduction sleeves
- Repeated resharpening — HSS steel allows the cutting edge to be restored without loss of cutting properties
The Ø78 mm Morse taper drill bit is a tool for plants equipped with heavy machine tools — radial drilling machines, boring machines, and machining centers. Typical applications: holes for bearing bushings, valve seats, and process holes in castings. Tolerance H12 (Ø78.000–Ø78.300 mm).
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 Ø78 MM DRILL BIT:
| ✓ | MT6 → MT5 — not recommended (socket capacity below the operating load) |
| ✓ | MT6 → MT4 — not recommended (socket significantly undersized for the load) |
| ✓ | MT6 drill drift — for removing the drill bit from the spindle |
Cutting data for the Ø78 mm drill bit according to ISO 513
Recommended machining conditions for a diameter of Ø78 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 | 0.40 | 45÷82 | 18÷33 |
| K Cast iron | Gray cast iron GG20–GG30 | 13÷16 | 0.40 | 53÷65 | 21÷26 |
| N Copper and Al alloys | Cu, CuZn, Al, and alloys | 25÷28 | 0.50÷0.63 | 102÷114 | 51÷72 |
Pressurized coolant is mandatory
At a diameter of 78 mm, drilling without pressurized coolant is not permitted. Minimum coolant system flow rate: 10 l/min, emulsion concentration 8–10%. Lack of cooling leads to cutting-edge overheating, hardening of the material in the cutting zone, and drill breakage.
Material compatibility of the Ø78 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 50%, pilot drilling required)
▲ Aluminum and Al alloys (increased Vc, emulsion cooling)
✗ Hardened steels above 45 HRC
Frequently asked questions about the Ø78 mm drill bit
Yes — an HSSE drill bit with the same dimensions (DIN 345) is a 1:1 replacement. The difference: HSSE with 5% cobalt better withstands the temperatures encountered during prolonged large-diameter drilling. When machining only carbon steels, the difference is small.
Maximum runout of 0.03 mm measured at the drill tip. Clean the taper and socket before each installation. Do not nest reduction sleeves. Replace the drill bit if the taper shows signs of wear or indentation.
At least 7 kW with an MT6 Morse taper spindle and power feed. Radial drilling machines with an arm length of at least 1200 mm. Torque at a diameter of 78 mm in steel exceeds 200 Nm.
Product accessories
Reduction sleeve MK6 MK5 1751 PTPa DIN 228
Reference: 1187 In stock < 10 items
€44.74
€55.03 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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