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Drill 99 NWKc HSS DIN 345
0000009250
Diameter (mm): 99301 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
€679.74 tax inc.
Net price: €552.63
Description
DIAMETER Ø99 mm
MORSE TAPER MT6
OVERALL LENGTH 530 mm
FLUTE LENGTH 260 mm
Technical specifications of the Ø99 mm drill bit
Twist drill with Morse taper shank
| TECHNICAL DATA | |
|---|---|
| Diameter | Ø99 NWKc HSS |
| Standard | DIN 345 |
| Drill type | NWKc — twist drill with taper shank |
| Material | HSS (high-speed steel) |
| Overall length l1 | 530 mm |
| Flute length l2 | 260 mm |
| Morse taper | MT6 |
| Point angle | 118° |
| Diameter tolerance | h8 |
| Cutting direction | Right-hand |
Ø99 mm HSS metal drill bit – Morse taper MT6
Product description and key benefits
The Ø99 mm metal drill bit with an MT6 Morse taper requires experience in selecting cutting parameters and drilling sequences — the 77–100 mm diameter range is the domain of specialists. The operator must provide: a Ø25–30 mm pilot hole, power feed, pressurized coolant, and rigid workpiece clamping. Failure to meet any of these conditions when using the Ø99 Morse taper drill bit risks tool breakage or spindle damage.
Key benefits of the Ø99 mm metal drill bit
- Secure MT6 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 260 mm — enables drilling through holes in components up to 250 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 Ø99 Morse taper drill bit is reserved for the most demanding drilling operations — holes in thick castings, foundation plates with a thickness exceeding 100 mm, and mining machinery housings. Tolerance H12, Ø99.000–Ø99.350 mm; more precise holes require 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 Ø99 MM DRILL BIT:
| ✓ | MT6 → MT5 — not recommended (socket capacity below the operating load) |
| ✓ | MT6 → MT4 — not recommended (socket significantly undersized for the load) |
| ✓ | MT6 drill drift — for removing the drill bit from the spindle |
Cutting data for the Ø99 mm drill bit according to ISO 513
Recommended machining conditions for a diameter of Ø99 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 | 0.40 | 35÷64 | 14÷26 |
| K Cast iron | Gray cast iron GG20–GG30 | 13÷16 | 0.40 | 42÷51 | 17÷20 |
| N Copper and Al alloys | Cu, CuZn, Al, and alloys | 25÷28 | 0.50÷0.63 | 80÷90 | 40÷57 |
Pressurized coolant is mandatory
At a diameter of 99 mm, drilling without pressurized coolant is not permitted. Minimum coolant system flow rate: 10 l/min, emulsion concentration 8–10%. Lack of cooling leads to cutting-edge overheating, hardening of the material in the cutting zone, and drill breakage.
Material compatibility of the Ø99 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 Ø99 mm drill bit
Maximum runout of 0.03 mm measured at the drill tip. Clean the taper and socket before each installation. Do not nest reduction sleeves. Replace the drill bit if the taper shows signs of wear or indentation.
At least 7 kW with an MT6 Morse taper spindle and power feed. Radial drilling machines with an arm length of at least 1200 mm. Torque at a diameter of 99 mm in steel exceeds 200 Nm.
At least two: 1) a Ø25–30 mm pilot hole, 2) the final Ø99 mm drill bit. For diameters above 90 mm, consider three stages: pilot Ø25 → intermediate Ø50 → final Ø99 mm.
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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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