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Drill 37.8 NWKc HSS DIN 345
637710
Diameter (mm): 37,8301 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
€58.26 tax inc.
Net price: €47.37
Description
DIAMETER Ø37.8 mm
MORSE TAPER MT4
OVERALL LENGTH 349 mm
FLUTE LENGTH 200 mm
Technical specifications of the Ø37.8 mm drill bit
Twist drill with Morse taper shank
| TECHNICAL DATA | |
|---|---|
| Diameter | Ø37.8 NWKc HSS |
| Standard | DIN 345 |
| Drill type | NWKc — twist drill with taper shank |
| Material | HSS (high-speed steel) |
| Overall length l1 | 349 mm |
| Flute length l2 | 200 mm |
| Morse taper | MT4 |
| Point angle | 118° |
| Diameter tolerance | h8 |
| Cutting direction | Right-hand |
Ø37.8 mm HSS metal drill bit – Morse taper MT4
Product description and key benefits
The Ø37.8 mm HSS metal drill bit with an MT4 Morse taper shank is designed for heavy-duty hole machining in structural and alloy steels. DIN 345 specifies an MT4 taper for diameters of 32–50 mm, providing a compromise between shank size and load capacity. The Ø37.8 Morse taper drill bit requires a machine tool with a power rating of at least 2.2 kW and a Morse taper spindle.
Key benefits of the Ø37.8 mm metal drill bit
- MT4 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 349 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 = 200 mm, the resharpening allowance is approximately 25 mm
- Sleeve compatibility — use on drilling machines with MT3 to MT5 spindles using reduction sleeves
The Ø37.8 Morse taper drill is designed for drilling holes in machine housings, frames, and foundation plates. At MT4 diameters, the tool requires a machine with power feed — manual drilling will not provide uniform pressure. Holes within tolerance class H12, Ø37.800–Ø38.050 mm; tighter fits are achieved by 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 Ø37.8 MM DRILL BIT:
| ✓ | MT4 → MT5 — for a spindle with an MT5 socket |
| ✓ | MT4 → MT3 — for a spindle with an MT3 socket |
| ✓ | MT4 drill drift — for removing the drill bit from the spindle |
Cutting data for the Ø37.8 mm drill bit according to ISO 513
Recommended machining conditions for a diameter of Ø37.8 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 | 0.25 | 93÷168 | 23÷42 |
| K Cast iron | Gray cast iron GG20–GG30 | 13÷16 | 0.25 | 109÷135 | 27÷34 |
| N Copper and Al alloys | Cu, CuZn, Al, and alloys | 25÷28 | 0.32÷0.40 | 211÷236 | 68÷94 |
Minimum machine tool power
The Ø37.8 mm drill requires a drilling machine with at least 2.2 kW of power and power spindle feed. Stability is difficult to maintain with manual feed — uneven pressure leads to vibration and accelerated cutting edge wear. A box-column or radial drilling machine is recommended.
Material compatibility of the Ø37.8 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 Ø37.8 mm drill bit
For diameters up to approximately 40 mm, drilling into solid material is possible after spot drilling with an NC 90° drill. Above 40 mm, a Ø20–25 mm pilot hole is recommended to reduce axial force by 40–50% and eliminate vibration from the chisel edge.
When drilling S355 steel with a Ø37.8 mm drill, the torque is approximately 94 Nm. This requires a drilling machine with a minimum power rating of 2.3 kW and power spindle feed.
For a drilling machine with an MT5 spindle: MT4→MT5 sleeve. For a smaller MT3 spindle: MT4→MT3 sleeve (check that the operating load does not exceed the socket capacity). For removal: MT4 drill drift.
Product accessories
Reduction sleeve MK6 MK4 1751 PTPa DIN 228
Reference: 1186 In stock < 10 items
€36.84
€45.32 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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