- 98% satisfied customers
- 72h delivery
- 30 dni na zwrot
Counterbore 18X8.5 DIN 375 HSS
0000011343
Diameter × pilot: 18×8.5 mm49 sizes of this countersink
18×8.5 mm18×11 mm20×10.2 mm20×14 mm23×12 mm23×15 mm23×16 mm24×12 mm24×16 mm26×14 mm26×17 mm26×18 mm28×15,3 mm29×15.5 mm29×20 mm30×15.5 mm30×19 mm30×20 mm32×26 mm33×17.5 mm33×21 mm33×22 mm34×29 mm36×19.5 mm36×24 mm37×25 mm38×21 mm38×25 mm38×31.5 mm39×21 mm39×26 mm40×21 mm40×26 mm42×28 mm43×24 mm43×28 mm43×30 mm46×27 mm46×3348×26.5 mm48×3349×36 mm53×29.5 mm53×36 mm54×22 mm55×31.5 mm57×32 mm57×36 mm57×39 mm
€23.63 tax inc.
Net price: €19.21
Description
Cutting diameterØ18 mm
Pilot diameterØ8.5 mm
Morse taperMT 2
For threadM10
M10 18×8.5 mm counterbore with Morse taper MT 2 shank
Type DWCb · DIN 375 · high-speed steel (HSS) · Artykuly Techniczne brand
18×8.5 mm counterbore with Morse taper MT 2 shank (type DWCb per standard DIN 375) produces flat, perpendicular seats Ø18 mm in Ø8.5 mm holes. The pilot matches the tap drill hole for the thread M10 (Ø8.5 mm drill) — the head counterbore is machined before tapping. The taper mounting MT 2 transmits high torque without slipping, while the pilot Ø8.5 mm keeps the counterbore coaxial with the hole. High-speed steel HSS allows machining of steel, cast iron, aluminum, and nonferrous metals. A tool from the Polish brand Artykuly Techniczne.
| Technical data | |
|---|---|
| Counterbore diameter D | 18 mm |
| Pilot diameter d₁ | 8.5 mm |
| Morse taper shank | MT 2 |
| Flute length l | 25 mm |
| Pilot length l₁ | 10 mm |
| Overall length L | 150 mm |
| For thread | M10 |
| Material | HSS |
| Standard | DIN 375 DWCb |
| Brand | Artykuly Techniczne |
| Country of manufacture | Poland |
Applications and workpiece materials
Applications and materials for the counterbore with Morse taper MT 2 shank
Typical applications:
| ✓ | Counterboring holes for cylindrical heads of M10 screws (DIN 912 / ISO 4762) |
| ✓ | Machining large steel parts, housings, and welded structures |
| ✓ | Spotfacing around the hole |
| ✓ | Use on pillar and radial drilling machines with Morse taper sockets and on milling machines |
Workpiece materials
✓Structural and carbon steels
✓Copper, brass, bronze
✓Aluminum and light alloys
▲Alloy and stainless steels — with coolant
✗Hardened steels above 45 HRC
Fixed pilot and Morse taper shank — rigid guidance
Pilot Ø8.5 mm guides the tool coaxially in the hole, while the taper shank Morse taper MT 2 transmits high torque without slipping — at a cutting diameter of Ø18 mm, this is essential for stable operation without vibration. Steel HSS retains its cutting hardness up to an operating temperature of approx. 600°C.
Cutting data
Guideline values for HSS · Ø18 mm
| Material group (ISO 513) | Vc [m/min] | fz [mm/tooth] | n [rpm] · Ø18 | f [mm/min] · Z=3 |
|---|---|---|---|---|
| PStructural and alloy steel | 5–25 | 0.03–0.10 | 90–440 | 8–130 |
| MStainless steel | 6–15 | 0.03–0.06 | 110–270 | 10–50 |
| KCast iron | 10–20 | 0.08–0.12 | 180–350 | 40–130 |
| NNonferrous metals (Al, Cu, brass) | 15–80 | 0.06–0.14 | 270–1 400 | 50–590 |
| SDifficult-to-machine alloys and titanium | 8 | 0.04 | ≈140 | ≈17 |
Vc — cutting speed, fz — feed per tooth. Columns n and f calculated for D = 18 mm assuming Z = 3, the typical number of cutting edges on counterbores (rounded). For tools made of steel HSS-E the cutting parameters can be increased by 25%.
How n and f were calculated (Ø18, assumed Z = 3)
Spindle speed n = (Vc × 1000) ÷ (π × D), feed rate per minute f = fz × Z × n. Example for steel (Vc = 20, fz = 0.1): n = 20 000 ÷ 56.5 ≈ 350 rpm, f = 0.1 × 3 × 350 ≈ 110 mm/min. Start at the lower end of the range and adjust according to the material and clamping rigidity.
Tips and limitations
How to extend tool life
HSS limitations
The tool is not intended for hardened steels above 45 HRC. For stainless and alloy steels, reduce the speed and use coolant — overheating accelerates cutting edge wear. Make sure the hole diameter matches the pilot Ø8.5 mm, and before use, check that the taper is compatible MT 2 with the spindle socket — use a Morse taper reduction sleeve if needed.
Frequently asked questions
The shank seats directly in the MT 2 spindle socket of a pillar drill, radial drilling machine, or milling machine. If the spindle has a larger taper, use a Morse taper reduction sleeve; a drift wedge is used for removal. The taper must be clean and dry before insertion — only then can it transmit full torque without slipping.
The larger the cutting diameter, the lower the spindle speed: approx. 90–440 rpm for structural steel, approx. 180–350 rpm for cast iron, and a maximum of approx. 1 400 rpm for aluminum. Start at the lower end of the range, use a firm, steady feed, and apply coolant.
The counterbore machines seats for cylindrical heads of M10 screws (DIN 912 / ISO 4762). The Ø8.5 mm pilot matches the tap drill hole for an M10 thread — the head seat is machined before tapping the hole. The Ø18 mm counterbore diameter accommodates an M10 socket head cap screw head (Ø16 mm per DIN 912) with clearance.
Reviews
No customer reviews for the moment.
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 |
Recommended for you
This website uses its own and third-party cookies to improve our services and show you advertising related to your preferences by analyzing your browsing habits. To give your consent to its use, press the Accept button.
Cookie preferences
Functional cookiesTechnical
Functional cookies are strictly necessary to provide the services of the shop, as well as for its proper functioning, so it is not possible to refuse their use. They allow the user to browse through our website and use the different options or services that exist on it.
Advertising Cookies
These are cookies that collect information about the advertisements shown to users of the website. They can be anonymous, if they only collect information about the advertising spaces shown without identifying the user, or personalised, if they collect personal information about the user of the shop by a third party, for the personalisation of these advertising spaces.
Analytics cookies
Collect information about the user's browsing experience in the shop, usually anonymously, although sometimes they also allow the user to be uniquely and unequivocally identified in order to obtain reports on the user's interests in the products or services offered by the shop.