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Metal drill bit 44.5 NWKc HSS DIN 345
0436
Diameter (mm): 44,5301 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
€119.76 tax inc.
Net price: €97.37
Description
DIAMETER Ø44.5 mm
MORSE TAPER MT4
OVERALL LENGTH 359 mm
FLUTE LENGTH 210 mm
Technical specifications of the Ø44.5 mm drill bit
Twist drill with Morse taper shank
| TECHNICAL DATA | |
|---|---|
| Diameter | Ø44.5 NWKc HSS |
| Standard | DIN 345 |
| Drill type | NWKc — twist drill with taper shank |
| Material | HSS (high-speed steel) |
| Overall length l1 | 359 mm |
| Flute length l2 | 210 mm |
| Morse taper | MT4 |
| Point angle | 118° |
| Diameter tolerance | h8 |
| Cutting direction | Right-hand |
Ø44.5 mm HSS metal drill bit – Morse taper MT4
Product description and key benefits
The Ø44.5 mm metal drill bit with an MT4 Morse taper is a large-diameter tool whose mechanical loads require an MT4 taper with a diameter of 31.27 mm. At Ø44.5, torque in S355 steel is high enough to require a rigid machine base. The Ø44.5 Morse taper drill bit can operate at full speed only with abundant emulsion cooling and power spindle feed.
Key benefits of the Ø44.5 mm metal drill bit
- Self-holding taper shank — MT4 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 359 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 MT3 to MT5 spindles using reduction sleeves
- Repeated resharpening — HSS steel allows the cutting edge to be restored without loss of cutting properties
The Ø44.5 Morse taper drill is designed for drilling holes in machine housings, frames, and foundation plates. At MT4 diameters, the tool requires a machine with power feed — manual drilling will not provide uniform pressure. Holes within tolerance class H12, Ø44.500–Ø44.750 mm; 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 Ø44.5 MM DRILL BIT:
| ✓ | MT4 → MT5 — for a spindle with an MT5 socket |
| ✓ | MT4 → MT3 — for a spindle with an MT3 socket |
| ✓ | MT4 drill drift — for removing the drill bit from the spindle |
Cutting data for the Ø44.5 mm drill bit according to ISO 513
Recommended machining conditions for a diameter of Ø44.5 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 | 79÷143 | 20÷36 |
| K Cast iron | Gray cast iron GG20–GG30 | 13÷16 | 0.25 | 93÷114 | 23÷28 |
| N Copper and Al alloys | Cu, CuZn, Al, and alloys | 25÷28 | 0.32÷0.40 | 179÷200 | 57÷80 |
Minimum machine tool power
The Ø44.5 mm drill requires a drilling machine with at least 2.2 kW of power and power spindle feed. Stability is difficult to maintain with manual feed — uneven pressure leads to vibration and accelerated cutting edge wear. A box-column or radial drilling machine is recommended.
Material compatibility of the Ø44.5 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 40%, ample coolant)
▲ Aluminum and Al alloys (emulsion coolant required)
✗ Hardened steels above 45 HRC
Frequently asked questions about the Ø44.5 mm drill bit
Depth greater than 3×D (133 mm): reduce feed by 30–50%, retract every 1×D, and use a 6–8% emulsion at a minimum flow rate of 6 l/min. Peck drilling prevents chips from jamming in the flutes.
1) Clean the taper and spindle socket. 2) Check runout (maximum 0.03 mm). 3) Replace the drill if the taper is damaged or worn. 4) Do not stack reduction sleeves (e.g., MT4→MT3→MT5).
For diameters up to approximately 40 mm, drilling into solid material is possible after spot drilling with an NC 90° drill. Above 40 mm, a Ø20–25 mm pilot hole is recommended to reduce axial force by 40–50% and eliminate vibration from the chisel edge.
Product accessories
Reduction sleeve MK6 MK4 1751 PTPa DIN 228
Reference: 1186 In stock < 10 items
€36.84
€45.32 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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