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Description
DIAMETER Ø29 mm
MORSE TAPER MT3
OVERALL LENGTH 296 mm
FLUTE LENGTH 175 mm
Technical specifications of the Ø29 mm drill bit
Twist drill with Morse taper shank
| TECHNICAL DATA | |
|---|---|
| Diameter | Ø29 NWKc HSSE |
| Standard | DIN 345 |
| Drill type | NWKc — twist drill with taper shank |
| Material | HSSE (cobalt high-speed steel) |
| Overall length l1 | 296 mm |
| Flute length l2 | 175 mm |
| Morse taper | MT3 |
| Point angle | 118° |
| Diameter tolerance | h8 |
| Cutting direction | Right-hand |
Ø29 mm HSSE twist drill – MT3 Morse taper
Product description and key benefits
The Ø29 mm metal drill bit with an MT3 Morse taper is a tool in the diameter range where the MT2 taper no longer provides sufficient contact area. DIN 345 specifies an MT3 taper with a diameter of 23.83 mm for drill diameters of 23–31 mm, transmitting the torque generated when drilling heavy steel structures. The Ø29 Morse taper drill bit requires a pillar or box-column drilling machine with a power rating of at least 1.5 kW.
Key benefits of the Ø29 mm metal drill bit
- 5% cobalt in the HSS matrix — raises the tempering temperature to 650°C — 50°C higher than standard HSS
- Direct mounting in an MT3 spindle — eliminates the chuck as a source of runout — particularly important when drilling stainless steels, where runout reduces surface quality
- Drilling austenitic steels — the HSSE cutting edge handles work hardening in 304/316/321 steels
- h8 diameter tolerance — repeatable hole size even in difficult-to-machine materials
- Conforms to DIN 345 — dimensions identical to HSS — a replacement for use in existing machining cells
- Repeated resharpening — HSSE steel retains its properties after the cutting edge is reground on a tool grinder
The Ø29 mm Morse taper drill is selected for holes for pins, bearing bushings, and flanged connections in machinery manufacturing. It is suitable for machining foundation plates and bearing end shields. H12 tolerance holes (Ø29.000–Ø29.210 mm); tighter fits are achieved by reaming or 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 Ø29 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 Ø29 mm drill bit according to ISO 513
Recommended machining conditions for a diameter of Ø29 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 | 121÷220 | 24÷44 |
| K Cast iron | Gray cast iron GG20–GG30 | 13÷16 | 0.20 | 143÷176 | 29÷35 |
| N Copper and Al alloys | Cu, CuZn, Al, and alloys | 25÷28 | 0.25÷0.32 | 274÷307 | 68÷98 |
Coolant selection for drilling diameters of 23–31 mm
At a diameter of 29 mm, the volume of chips removed is considerable — the helical flutes must evacuate a large amount of material. Use an emulsion at a concentration of 6–8% with a flow rate of at least 5 l/min. Without pressurized coolant, limit the depth of each pass to 58 mm.
Material compatibility of the Ø29 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 30%, ample coolant)
▲ Aluminum and Al alloys (emulsion coolant required)
✗ Hardened steels above 45 HRC
Frequently asked questions about the Ø29 mm drill bit
The HSS drill can handle stainless steel with Vc reduced by 40% and ample coolant. For regular INOX machining, an HSSE (cobalt) drill of the same diameter is recommended.
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.
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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| 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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