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Description
DIAMETER Ø12.5 mm
MORSE TAPER MT1
OVERALL LENGTH 182 mm
FLUTE LENGTH 101 mm
Technical specifications of the Ø12.5 mm drill bit
Twist drill with Morse taper shank
| TECHNICAL DATA | |
|---|---|
| Diameter | Ø12.5 NWKc HSSE |
| Standard | DIN 345 |
| Drill type | NWKc — twist drill with taper shank |
| Material | HSSE (cobalt high-speed steel) |
| Overall length l1 | 182 mm |
| Flute length l2 | 101 mm |
| Morse taper | MT1 |
| Point angle | 118° |
| Diameter tolerance | h8 |
| Cutting direction | Right-hand |
Ø12.5 mm HSSE twist drill – MT1 Morse taper
Product description and key benefits
The Ø12.5 mm NWKc twist drill with an MT1 taper is designed for precision drilling in structural steels on pillar drilling machines. The Morse taper shank provides secure, self-holding seating in the spindle — eliminating the risk of the tool slipping rotationally under increased cutting torque. With a flute length of 101 mm, the Ø12.5 Morse taper drill allows through holes to be drilled in typical shop sections and sheet metal.
Key benefits of the Ø12.5 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 MT1 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 Ø12.5 mm Morse taper drill is selected for repair and assembly work on pillar drilling machines. The tool allows fast drilling of through and blind holes in steels with tensile strengths up to 900 N/mm². H12 tolerance at Ø12.500–Ø12.680 mm provides dimensional accuracy sufficient for most bolted connections.
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 Ø12.5 MM DRILL BIT:
| ✓ | MT1 → MT2 — for a spindle with an MT2 socket |
| ✓ | MT1 → MT3 — for a spindle with an MT3 socket |
| ✓ | MT1 drill drift — for removing the drill bit from the spindle |
Cutting data for the Ø12.5 mm drill bit according to ISO 513
Recommended machining conditions for a diameter of Ø12.5 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 | 0.12 | 280÷509 | 34÷61 |
| K Cast iron | Gray cast iron GG20–GG30 | 13÷16 | 0.12 | 331÷407 | 40÷49 |
| N Copper and Al alloys | Cu, CuZn, Al, and alloys | 25÷28 | 0.16÷0.20 | 637÷713 | 102÷143 |
Coolant for drilling steel
The Ø12.5 mm HSS drill requires cooling with a 5–8% emulsion when drilling structural steels. Dry drilling reduces cutting edge life by 50–70% and reduces hole surface quality. Minimum coolant flow: 2 l/min.
Material compatibility of the Ø12.5 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 30%, ample coolant)
▲ Aluminum and Al alloys (emulsion coolant required)
✗ Hardened steels above 45 HRC
Frequently asked questions about the Ø12.5 mm drill bit
Yes — using an MT1→MT2 reduction sleeve. The sleeve ensures proper seating of the taper in the larger spindle socket. Use a correctly sized drill drift for removal.
The maximum drilling depth is the flute length l2 = 101 mm minus the drill point length (approximately 4 mm). The effective usable depth is therefore approximately 97 mm.
In S235/S355 structural steels, spot drilling is not necessary — the 118° angle provides self-centering. Spot drilling with an NC 90° drill is recommended when drilling on milled surfaces, castings with machining allowance, or difficult-to-machine materials.
Product accessories
Reduction sleeve MK4 MK1 1751 PTPa DIN 228
Reference: 1179 In stock > 10 items
€15.79
€19.42 brutto
Reduction sleeve MK3 MK1 1751 PTPa DIN 228
Reference: 1184 In stock > 10 items
€11.84
€14.57 brutto
Reduction sleeve MK5 MK1 1751 PTPa DIN 228
Reference: 1185 In stock > 10 items
€22.37
€27.51 brutto
Reduction sleeve MK2 MK1 1751 PTPa DIN 228
Reference: 2586 In stock < 10 items
€9.21
€11.33 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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