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Drill 73 NWKc HSS DIN 345
300517
Diameter (mm): 73301 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
€317.21 tax inc.
Net price: €257.89
Description
DIAMETER Ø73 mm
MORSE TAPER MT5
OVERALL LENGTH 447 mm
FLUTE LENGTH 260 mm
Technical specifications of the Ø73 mm drill bit
Twist drill with Morse taper shank
| TECHNICAL DATA | |
|---|---|
| Diameter | Ø73 NWKc HSS |
| Standard | DIN 345 |
| Drill type | NWKc — twist drill with taper shank |
| Material | HSS (high-speed steel) |
| Overall length l1 | 447 mm |
| Flute length l2 | 260 mm |
| Morse taper | MT5 |
| Point angle | 118° |
| Diameter tolerance | h8 |
| Cutting direction | Right-hand |
Ø73 mm HSS metal drill bit – Morse taper MT5
Product description and key benefits
The Ø73 mm NWKc metal drill bit with an MT5 Morse taper is a tool used exclusively on heavy stationary machine tools — in the 51–76 mm diameter range. Neither a magnetic drill nor a benchtop drill press provides sufficient rigidity or power. The Ø73 Morse taper drill bit requires two-stage drilling (pilot + final diameter), which eliminates vibration generated by the chisel edge measuring several millimeters in length.
Key benefits of the Ø73 mm metal drill bit
- MT5 taper — direct mounting — eliminates the drill chuck as a source of radial runout and tool slippage
- HSS cutting edge, 63–65 HRC — hardness that ensures stable cutting of steels with tensile strengths up to 900 N/mm² throughout the interval between sharpenings
- Right-hand helical flutes — effective chip evacuation from the cutting zone — essential when drilling holes deeper than 2×D
- Compact 447 mm design — shorter tool overhang provides greater rigidity and less vibration
- Repeated reconditioning — the HSS cutting edge can be resharpened 8–12 times while retaining its geometry — at l2 = 260 mm, the resharpening allowance is approximately 32 mm
- Sleeve compatibility — use on drilling machines with MT4 to MT6 spindles using reduction sleeves
The Ø73 mm Morse taper drill is used in the production of drive, transmission, and hydraulic cylinder components. Holes for bearing bushings and valve seats require preliminary drilling with a twist drill before boring. H12 tolerance, Ø73.000–Ø73.300 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 Ø73 MM DRILL BIT:
| ✓ | MT5 → MT6 — for a spindle with an MT6 socket |
| ✓ | MT5 → MT4 — not recommended (socket capacity below the operating load) |
| ✓ | MT5 drill drift — for removing the drill bit from the spindle |
Cutting data for the Ø73 mm drill bit according to ISO 513
Recommended machining conditions for a diameter of Ø73 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 | 48÷87 | 19÷35 |
| K Cast iron | Gray cast iron GG20–GG30 | 13÷16 | 0.40 | 57÷70 | 23÷28 |
| N Copper and Al alloys | Cu, CuZn, Al, and alloys | 25÷28 | 0.50÷0.63 | 109÷122 | 54÷77 |
Minimum machine power for diameters of 50+ mm
The Ø73 mm drill requires a machine with a power rating above 4 kW and an MT5 or larger spindle. Torque when drilling S355 steel reaches 146 Nm — pillar drilling machines rated below 3 kW will not provide stable cutting conditions.
Material compatibility of the Ø73 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 Ø73 mm drill bit
At least 4 kW of motor power and an MT5 or larger spindle. When drilling S355 steel, torque at the drill reaches 182 Nm — bench and magnetic drilling machines do not provide sufficient rigidity. The optimal machine is a box-column or radial drilling machine with power feed.
Yes — it is required. A Ø20–25 mm pilot hole eliminates cutting by the chisel edge, which at a diameter of 73 mm generates 60–70% of the total axial force and severe vibration.
1) Drill a Ø20–25 mm pilot hole. 2) Check runout in the spindle (maximum 0.03 mm). 3) Clamp the workpiece rigidly. 4) Use power feed — manual feed causes uneven pressure and resonance.
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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