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Metal drill bit 27.5 NWKc HSS DIN 345 Baildon
0391
Diameter (mm): 27,5301 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
€31.72 tax inc.
Net price: €25.79
Description
DIAMETER Ø27.5 mm
MORSE TAPER MT3
OVERALL LENGTH 291 mm
FLUTE LENGTH 170 mm
Technical specifications of the Ø27.5 mm drill bit
Twist drill with Morse taper shank
| TECHNICAL DATA | |
|---|---|
| Diameter | Ø27.5 NWKc HSS |
| Standard | DIN 345 |
| Drill type | NWKc — twist drill with taper shank |
| Material | HSS (high-speed steel) |
| Overall length l1 | 291 mm |
| Flute length l2 | 170 mm |
| Morse taper | MT3 |
| Point angle | 118° |
| Diameter tolerance | h8 |
| Cutting direction | Right-hand |
Ø27.5 mm HSS metal drill bit – Morse taper MT3
Product description and key benefits
The Ø27.5 mm metal drill bit with an MT3 Morse taper shank to DIN 345 belongs to the group of tools designed for machining medium- and large-diameter holes. At Ø27.5, type N flute geometry provides chip evacuation proportional to the volume of material being removed. The Ø27.5 Morse taper drill bit with a 118° point angle allows self-centering in steels with tensile strengths up to 900 N/mm² without spot drilling.
Key benefits of the Ø27.5 mm metal drill bit
- Secure MT3 taper mounting — the self-holding taper conforming to DIN 345 transmits cutting torque without intermediate components — no drill chuck is required
- HSS steel resistant to temperatures up to 600°C — the cutting edge retains its working hardness at the cutting speeds recommended for structural steels and cast iron
- Flute length 170 mm — enables drilling through holes in components up to 160 mm thick without extensions
- Self-centering 118° geometry — eliminates spot drilling on flat surfaces — saves time in batch production
- Diameter tolerance class h8 — the predrilled hole is ready for reaming to H7 without an additional boring bar pass
- Full interchangeability according to DIN 345 — identical taper dimensions regardless of manufacturer — the drill can be replaced without adjusting the machine
The Ø27.5 mm Morse taper drill bit is used to manufacture infrastructure components — columns, supports, brackets, and load-bearing frames. In steel construction, hole diameters of 23–31 mm correspond to M22–M30 bolts. An H12 tolerance of Ø27.500–Ø27.710 mm is sufficient for through holes.
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 Ø27.5 MM DRILL BIT:
| ✓ | MT3 → MT4 — for a spindle with an MT4 socket |
| ✓ | MT3 → MT5 — for a spindle with an MT5 socket |
| ✓ | MT3 drill drift — for removing the drill bit from the spindle |
Cutting data for the Ø27.5 mm drill bit according to ISO 513
Recommended machining conditions for a diameter of Ø27.5 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 | 0.20 | 127÷231 | 25÷46 |
| K Cast iron | Gray cast iron GG20–GG30 | 13÷16 | 0.20 | 150÷185 | 30÷37 |
| N Copper and Al alloys | Cu, CuZn, Al, and alloys | 25÷28 | 0.25÷0.32 | 289÷324 | 72÷104 |
Deep-hole drilling (over 3×D)
When drilling holes deeper than 82 mm (3×Ø27.5), use peck drilling with retraction every 1×D. Use ample emulsion coolant at a minimum concentration of 6–8%. Reduce the feed by 30–50%.
Material compatibility of the Ø27.5 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 Ø27.5 mm drill bit
A pillar or box-column drill press with an MT3 spindle and a power rating of at least 1.5 kW. For diameters above 25 mm, power feed is recommended — manual feed will not provide uniform pressure.
An HSSE drill bit contains 5% cobalt, which increases heat resistance from 600°C to 650°C. The practical difference: HSSE performs much better in stainless and difficult-to-machine steels. When machining only carbon steels, the difference in tool life is minimal.
Use peck drilling: retract the drill every 1–1.5×D, clear chips from the flutes, and cool with a 6–8% emulsion. Reduce the feed by 30–50% from the nominal value.
Product accessories
Reduction sleeve MK4 MK3 1751 PTPa DIN 228
Reference: 1180 In stock > 10 items
€18.42
€22.66 brutto
Reduction sleeve MK6 MK3 1751 PTPa DIN 228
Reference: 11965 In stock < 10 items
€36.84
€45.32 brutto
Reduction sleeve MK5 MK3 1751 PTPa DIN 228
Reference: 5702 In stock > 10 items
€26.32
€32.37 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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