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Counterbore 18X8.5 M10 DIN 373 HSS
0000003390
Diameter × pilot: 18×8.5 mm37 sizes of this countersink
5,5×3.2 mm5,8×2.5 mm6×2.5 mm6×3.2 mm6×3.4 mm7,2×3.2 mm7,5×3.2 mm7,5×4.3 mm7,5×4.5 mm8×3.3 mm8×4.3 mm8×4.5 mm9,5×4.2 mm9,5×5.5 mm10×4.2 mm10×5.3 mm10×5.5 mm10,5×5 mm10,5×6.4 mm10,5×6.5 mm11×5 mm11×6.4 mm11×6.6 mm14×8.4 mm14×9 mm15×6.8 mm15×8.4 mm15×8.5 mm15×9 mm16×9 mm17×11 mm18×8.5 mm18×10.5 mm18×11 mm20×10.2 mm20×13 mm20×14 mm
€25.25 tax inc.
Net price: €20.53
Description
Cutting diameterØ18 mm
Pilot diameterØ8.5 mm
Shank diameterØ12.5 mm
For threadM10
M10 18×8.5 mm counterbore with pilot
Type NWCa · DIN 373 · high-speed steel (HSS) · Artykuly Techniczne brand
M10 18×8.5 mm counterbore with pilot (type NWCa), manufactured to DIN 373, is used to machine seats for cylindrical screw heads M10. The fixed pilot Ø8.5 mm matches the tap drill hole for an M10 thread (Ø8.5 mm drill) — counterboring is performed before tapping, and the pilot guides the tool precisely along the axis of the future thread. As a M10 counterbore for metal performs well in steel, aluminum, copper, and brass. The tool bears the Polish brand Artykuly Techniczne — manufactured in Poland.
| Technical data | |
|---|---|
| Counterbore diameter D | 18 mm |
| Pilot diameter d₁ | 8.5 mm |
| Shank diameter d | 12.5 mm |
| Flute length l | 22 mm |
| Pilot length l₁ | 10 mm |
| Shank length l₂ | 40 mm |
| Overall length L | 100 mm |
| Number of cutting edges Z | 3 |
| For thread | M10 |
| Material | HSS |
| Standard | DIN 373 NWCa |
| Brand | Artykuly Techniczne |
| Country of manufacture | Poland |
Applications and workpiece materials
Applications and materials for the M10 counterbore
Typical applications:
| ✓ | Counterboring seats for cylindrical heads of M10 screws (DIN 912 / ISO 4762) |
| ✓ | Seat machined before tapping the Ø8.5 mm tap drill hole |
| ✓ | Spotfacing around the hole |
| ✓ | Use on CNC machines, drilling machines, and conventional machine tools |
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 — centering and perpendicularity
Pilot Ø8.5 mm enters the tap drill hole for an M10 thread and guides the tool coaxially — the counterbore remains perpendicular to the hole axis, and after tapping, the screw head makes full surface contact. 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 and Z = 3 (rounded). For tools made of steel HSS-E the cutting parameters can be increased by 25%.
How n and f were calculated (Ø18, 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 tap drill hole diameter matches the pilot Ø8.5 mm — counterbore before tapping the hole.
Frequently asked questions
The counterbore produces a flat seat for cylindrical heads of M10 screws, including DIN 912 / ISO 4762 socket head cap screws. The Ø8.5 mm pilot matches the tap drill hole for an M10 thread (Ø8.5 mm drill), so 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 a small clearance.
Yes — the tool has a Ø12.5 mm straight shank and fits drill chucks and collets. However, at a diameter of Ø18 mm, low speeds (approx. 90–440 rpm for steel) and rigid workpiece clamping are recommended — preferably a benchtop or pillar drill rather than a handheld drill.
Yes — for ISO M materials (stainless steel), operate at a reduced cutting speed (Vc approx. 6–15 m/min, or approx. 110–270 rpm for Ø18 mm) and use coolant to limit work hardening and overheating. Do not use the tool on hardened steels above 45 HRC.
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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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