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Drill 51 NWKc HSS DIN 345 Baildon
0000008513
Diameter (mm): 51301 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
€181.26 tax inc.
Net price: €147.37
Description
DIAMETER Ø51 mm
MORSE TAPER MT5
OVERALL LENGTH 412 mm
FLUTE LENGTH 225 mm
Technical specifications of the Ø51 mm drill bit
Twist drill with Morse taper shank
| TECHNICAL DATA | |
|---|---|
| Diameter | Ø51 NWKc HSS |
| Standard | DIN 345 |
| Drill type | NWKc — twist drill with taper shank |
| Material | HSS (high-speed steel) |
| Overall length l1 | 412 mm |
| Flute length l2 | 225 mm |
| Morse taper | MT5 |
| Point angle | 118° |
| Diameter tolerance | h8 |
| Cutting direction | Right-hand |
Ø51 mm HSS metal drill bit – Morse taper MT5
Product description and key benefits
The Ø51 mm metal drill bit is intended exclusively for stationary machine tools — box-column drilling machines, radial drilling machines, or boring machines with an MT5 Morse taper spindle and drive power above 4 kW. At this diameter, axial force when drilling S355 steel exceeds 10 kN, and torque reaches 100 Nm. The Ø51 Morse taper drill bit is used where a hole must be drilled into solid material without prior flame or plasma cutting.
Key benefits of the Ø51 mm metal drill bit
- Morse taper MT5 — self-holding mounting in the spindle eliminates slipping under full cutting torque
- HSS high-speed steel — the cutting edge retains its working hardness up to 600°C in structural and low-alloy steels
- Full compliance with DIN 345 — ensures interchangeability and compatibility with reduction sleeves and Morse taper spindles
- 118° point angle — versatile cutting geometry performs well in structural and medium-hard steels, cast iron, and aluminum
- Diameter tolerance h8 — repeatable hole size within a tolerance class that ensures consistent parameters in series production
- Resharpenable cutting edges — repeated sharpening on a grinder while maintaining the 118° angle and cutting edge symmetry
The Ø51 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, Ø51.000–Ø51.300 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 Ø51 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 Ø51 mm drill bit according to ISO 513
Recommended machining conditions for a diameter of Ø51 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 | 0.25 | 69÷125 | 17÷31 |
| K Cast iron | Gray cast iron GG20–GG30 | 13÷16 | 0.25 | 81÷100 | 20÷25 |
| N Copper and Al alloys | Cu, CuZn, Al, and alloys | 25÷28 | 0.32÷0.40 | 156÷175 | 50÷70 |
Mandatory pilot drilling
The Ø51 mm drill should not be used without a pilot hole. Drill a pilot hole using a Ø20–25 mm drill — this reduces axial force by 40–50% and eliminates engagement of the chisel edge responsible for vibration. At depths greater than 102 mm (2×D), use peck drilling with retraction every 30–40 mm and ample coolant (min. 8% emulsion, 8 l/min).
Material compatibility of the Ø51 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 Ø51 mm drill bit
Yes — it is required. A Ø20–25 mm pilot hole eliminates cutting by the chisel edge, which at a diameter of 51 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.
Yes — gray cast iron (GG20–GG30) and ductile cast iron (GGG40) are well suited to HSS drills. Short, brittle chips are easier to evacuate from the flutes than steel chips. Dry drilling with a compressed air blast is possible.
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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