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Drill 68 NWKc HSS DIN 345
11601
Diameter (mm): 68301 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
€265.42 tax inc.
Net price: €215.79
Description
DIAMETER Ø68 mm
MORSE TAPER MT5
OVERALL LENGTH 437 mm
FLUTE LENGTH 250 mm
Technical specifications of the Ø68 mm drill bit
Twist drill with Morse taper shank
| TECHNICAL DATA | |
|---|---|
| Diameter | Ø68 NWKc HSS |
| Standard | DIN 345 |
| Drill type | NWKc — twist drill with taper shank |
| Material | HSS (high-speed steel) |
| Overall length l1 | 437 mm |
| Flute length l2 | 250 mm |
| Morse taper | MT5 |
| Point angle | 118° |
| Diameter tolerance | h8 |
| Cutting direction | Right-hand |
Ø68 mm HSS metal drill bit – Morse taper MT5
Product description and key benefits
The Ø68 mm HSS twist drill with an MT5 Morse taper is designed for use on machine tools with a rigid construction and sufficient drive power. At diameters above 50 mm, the chisel edge generates a significant portion of the axial force — pilot holes reduce this effect and improve tool guidance stability. The Ø68 Morse taper drill is used in machinery plants, shipyards, and valve and fitting factories.
Key benefits of the Ø68 mm metal drill bit
- Self-holding taper shank — MT5 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 437 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 MT4 to MT6 spindles using reduction sleeves
- Repeated resharpening — HSS steel allows the cutting edge to be restored without loss of cutting properties
The Ø68 Morse taper drill is used in heavy machinery manufacturing plants, ship repair yards, and industrial valve and fitting factories. Typical applications include holes for mechanical anchors in foundation plates, holes in gearbox bearing end shields, and bores for guide bushings. Hole tolerance class H12 (Ø68.000–Ø68.300 mm); H7 and tighter fits are achieved by boring.
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 Ø68 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 Ø68 mm drill bit according to ISO 513
Recommended machining conditions for a diameter of Ø68 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 | 0.32 | 51÷94 | 16÷30 |
| K Cast iron | Gray cast iron GG20–GG30 | 13÷16 | 0.32 | 61÷75 | 20÷24 |
| N Copper and Al alloys | Cu, CuZn, Al, and alloys | 25÷28 | 0.40÷0.50 | 117÷131 | 47÷66 |
Minimum machine power for diameters of 50+ mm
The Ø68 mm drill requires a machine with a power rating above 4 kW and an MT5 or larger spindle. Torque when drilling S355 steel reaches 136 Nm — pillar drilling machines rated below 3 kW will not provide stable cutting conditions.
Material compatibility of the Ø68 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 Ø68 mm drill bit
H12 tolerance as standard. Reaming or boring is required for H7 or tighter fits — a twist drill cannot achieve these tolerances without finishing.
At least 4 kW of motor power and an MT5 or larger spindle. When drilling S355 steel, torque at the drill reaches 170 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 68 mm generates 60–70% of the total axial force and severe vibration.
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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