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Drill 91 NWKc HSS DIN 345 Guhring
0000009245
Diameter (mm): 91301 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
€550.26 tax inc.
Net price: €447.37
Description
DIAMETER Ø91 mm
MORSE TAPER MT6
OVERALL LENGTH 530 mm
FLUTE LENGTH 280 mm
Technical specifications of the Ø91 mm drill bit
Twist drill with Morse taper shank
| TECHNICAL DATA | |
|---|---|
| Diameter | Ø91 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 | 280 mm |
| Morse taper | MT6 |
| Point angle | 118° |
| Diameter tolerance | h8 |
| Cutting direction | Right-hand |
Ø91 mm HSS metal drill bit – Morse taper MT6
Product description and key benefits
The Ø91 mm metal drill bit is a specialist tool for machining very large-diameter holes on radial drilling machines and boring machines with an MT6 Morse taper spindle. At a diameter of 91 mm, axial force in structural steel exceeds 20 kN, and torque reaches 200 Nm — many times more than typical pillar drilling machines can handle. The Ø91 Morse taper drill bit is used exclusively for industrial machining: heavy machinery manufacturing, shipyards, and valve manufacturing plants.
Key benefits of the Ø91 mm metal drill bit
- MT6 taper — direct mounting — eliminates the drill chuck as a source of radial runout and tool slippage
- HSS cutting edge, 63–65 HRC — hardness that ensures stable cutting of steels with tensile strengths up to 900 N/mm² throughout the interval between sharpenings
- Right-hand helical flutes — effective chip evacuation from the cutting zone — essential when drilling holes deeper than 2×D
- Compact 530 mm design — shorter tool overhang provides greater rigidity and less vibration
- Repeated reconditioning — the HSS cutting edge can be resharpened 8–12 times while retaining its geometry — at l2 = 280 mm, the resharpening allowance is approximately 35 mm
- Sleeve compatibility — use on drilling machines with MT5 to MT6 spindles using reduction sleeves
The Ø91 mm Morse taper drill bit is used in plants equipped with heavy machine tools — radial drilling machines with an arm length of 1200+ mm and boring machines with an MT6 Morse taper spindle. Applications include holes in turbine, rolling mill, and press components. Tolerance grade H12, Ø91.000–Ø91.350 mm.
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 Ø91 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 Ø91 mm drill bit according to ISO 513
Recommended machining conditions for a diameter of Ø91 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 | 38÷70 | 15÷28 |
| K Cast iron | Gray cast iron GG20–GG30 | 13÷16 | 0.40 | 45÷56 | 18÷22 |
| N Copper and Al alloys | Cu, CuZn, Al, and alloys | 25÷28 | 0.50÷0.63 | 87÷98 | 44÷62 |
Pressurized coolant is mandatory
At a diameter of 91 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 Ø91 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 Ø91 mm drill bit
At least two: 1) a Ø25–30 mm pilot hole, 2) the final Ø91 mm drill bit. For diameters above 90 mm, consider three stages: pilot Ø25 → intermediate Ø50 → final Ø91 mm.
Pressurized coolant is mandatory: emulsion concentration 8–10%, minimum flow rate 10 l/min. Lack of cooling leads to cutting-edge overheating, hardening of the cutting zone, and tool breakage.
Yes — an HSSE drill bit with the same dimensions (DIN 345) is a 1:1 replacement. The difference: HSSE with 5% cobalt better withstands the temperatures encountered during prolonged large-diameter drilling. When machining only carbon steels, the difference is small.
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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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