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Description
Diameter D Ø18.75 mm
Tolerance h818.717–18.750 mm
Morse taper MT2
Material HSS
Taper shank roughing reamer Ø18.75 for metal — technical data
NRTa — shank-type roughing reamer, Morse taper shank, HSS
| Technical Data | |
|---|---|
| Cutting diameter D (h8) | Ø18.75 mm (18.717–18.750 mm) |
| Morse taper | MT2 |
| Flute length l | 44 mm |
| Overall length L | 203 mm |
| Type | NRTa — shank-type roughing reamer, Morse taper shank |
| Material | HSS (high-speed steel) |
Manufacturing tolerance h8 for a diameter of 18.75 mm
| Class | Deviations [mm] | Dimension [mm] | |
|---|---|---|---|
| h8 | 0 / −0.033 | 18.717 – 18.750 | VERSION |
Cutting diameter 18.75 mm prepares the hole for a finishing reamer Ø19 H7 — the roughing reamer leaves an allowance of approx. 0.25 mm on the diameter for finish reaming.
Cutting data for the roughing reamer Ø18.75
Indicative values for Ø18.75 mm
| Material group (ISO 513) | Vc [m/min] | fz [mm/tooth] | n [rpm] Ø18.75 |
|---|---|---|---|
| PStructural and carbon steel | 8–10 | 0.16–0.20 | 136 |
| MStainless steel | 2–3 | 0.16–0.20 | 34 |
| KCast iron | 3–5 | 0.16–0.20 | 51 |
| NAluminum and light alloys | 12–16 | 0.20–0.24 | 204 |
Vc — cutting speed, fz — feed per tooth (catalog values for HSS, selected for a diameter of Ø18.75 mm). Spindle speeds were calculated for the lower end of the range: n = (Vc × 1000) ÷ (π × D). Start with the lower values and adjust according to the material and clamping rigidity.
You may also need: Cutting parameters calculator
Applications of the roughing reamer Ø18.75 for metal
Rough machining of holes before finish reaming
Taper shank roughing reamer Ø18.75 for metal Morse MT2 — NRTa shank-type roughing reamer made of high-speed steel (HSS) HSS. Used for preliminary reaming of drilled holes — it removes a larger allowance, corrects the hole axis, and prepares the hole for a finishing reamer. The tool face has a ~45° lead-in chamfer for centered entry, while the guide margins on the cutting edges keep the tool aligned with the hole axis.
The roughing reamer Ø18.75 for metal improves hole geometry after drilling — it removes form errors, corrects the axis, and leaves a uniform allowance for finishing. The diameter 18.75 mm corresponds to a finished hole of Ø19 H7 (allowance of approx. 0.25 mm on the diameter). Cutting edges with large flutes efficiently evacuate chips when removing a larger allowance, while HSS withstands heavy cutting conditions. This diameter range is common in sliding fits: pins, shafts, plain bushings, and dowel pin holes in housings.
Workpiece materials
✓Structural and carbon steel
✓Gray cast iron
✓Aluminum and nonferrous alloys
▲Stainless steels — reduced cutting speed, generous coolant supply
✗Hardened steels above 45 HRC
Guidelines for correct reaming
- After rough reaming, ream to final size with a finishing reamer Ø19 H7 — stock allowance of 0.25 mm on the diameter.
- Use coolant (emulsion or cutting oil); cast iron can be machined dry.
- Withdraw the tool without reversing its rotation — reverse rotation damages the cutting edges.
Frequently asked questions — roughing reamer Ø18.75
A roughing reamer removes a large allowance after drilling, straightens the axis, and improves hole shape, but does not provide H7 tolerance. The hole is brought to final size with a finishing reamer.
The 18.75 mm diameter is selected for a finished hole of Ø19 H7 — after rough reaming, an allowance of approx. 0.25 mm remains on the diameter for the finishing reamer.
The short NRTa is more rigid — better for standard holes when clamped close to the spindle. The long NRTb with spiral flutes reaches deeper and evacuates chips from deep holes more efficiently.
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| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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