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Description
Cutting diameterØ48 mm
Pilot diameterØ26.5 mm
Overall length260 mm
Morse taperMT 4
48×26.5 mm counterbore with Morse taper MT 4 shank
Type DWCb · DIN 375 · high-speed steel (HSS) · Artykuly Techniczne brand
48×26.5 mm counterbore with Morse taper MT 4 shank (type DWCb), manufactured to DIN 375, is used to machine large, flat seats in holes with a diameter of 26.5 mm. The shank MT 4 provides rigid, coaxial mounting in the spindle of a pillar drill, radial drilling machine, or milling machine, while the fixed pilot Ø26.5 mm prevents the tool from drifting sideways in the hole. The tool bears the Polish brand Artykuly Techniczne — manufactured in Poland.
| Technical data | |
|---|---|
| Counterbore diameter D | 48 mm |
| Pilot diameter d₁ | 26.5 mm |
| Morse taper shank | MT 4 |
| Flute length l | 46 mm |
| Pilot length l₁ | 18 mm |
| Overall length L | 260 mm |
| 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 4 shank
Typical applications:
| ✓ | Flat Ø48 mm seats in holes with a diameter of 26.5 mm |
| ✓ | 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 Ø26.5 mm guides the tool coaxially in the hole, while the taper shank Morse taper MT 4 transmits high torque without slipping — at a cutting diameter of Ø48 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 · Ø48 mm
| Material group (ISO 513) | Vc [m/min] | fz [mm/tooth] | n [rpm] · Ø48 | f [mm/min] · Z=3 |
|---|---|---|---|---|
| PStructural and alloy steel | 5–25 | 0.03–0.10 | 35–170 | 3–50 |
| MStainless steel | 6–15 | 0.03–0.06 | 40–100 | 4–18 |
| KCast iron | 10–20 | 0.08–0.12 | 65–130 | 16–50 |
| NNonferrous metals (Al, Cu, brass) | 15–80 | 0.06–0.14 | 100–530 | 18–220 |
| SDifficult-to-machine alloys and titanium | 8 | 0.04 | ≈55 | ≈6 |
Vc — cutting speed, fz — feed per tooth. Columns n and f calculated for D = 48 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 (Ø48, 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 ÷ 150.8 ≈ 130 rpm, f = 0.1 × 3 × 130 ≈ 40 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 Ø26.5 mm, and before use, check that the taper is compatible MT 4 with the spindle socket — use a Morse taper reduction sleeve if needed.
Frequently asked questions
The shank seats directly in the MT 4 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. 35–170 rpm for structural steel, approx. 65–130 rpm for cast iron, and a maximum of approx. 530 rpm for aluminum. Start at the lower end of the range, use a firm, steady feed, and apply coolant.
The Ø26.5 mm pilot guides the tool in a hole with a diameter of 26.5 mm (the hole must not be smaller than the pilot). The counterbore machines a flat Ø48 mm seat in it — for nonstandard screw heads, washers, sleeves, or bearing surfaces.
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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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