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Roughing shell reamer 43.6 NRTb HSS
€80.92 tax inc.
Net price: €65.79
Description
Diameter D Ø43.6 mm
Tolerance h843.561–43.600 mm
Morse taper MT3
Material HSS
Long taper-shank roughing reamer Ø43.6 for metal — technical data
NRTb — long shank-type roughing reamer, spiral flutes, HSS
| Technical Data | |
|---|---|
| Cutting diameter D (h8) | Ø43.6 mm (43.561–43.600 mm) |
| Morse taper | MT3 |
| Flute length l | 170 mm |
| Overall length L | 291 mm |
| Type | NRTb — long shank-type roughing reamer, spiral flutes |
| Material | HSS (high-speed steel) |
Manufacturing tolerance h8 for a diameter of 43.6 mm
| Class | Deviations [mm] | Dimension [mm] | |
|---|---|---|---|
| h8 | 0 / −0.039 | 43.561 – 43.600 | VERSION |
Cutting diameter 43.6 mm prepares the hole for a finishing reamer Ø44 H7 — the roughing reamer leaves an allowance of approx. 0.4 mm on the diameter for finish reaming.
Cutting data for the roughing reamer Ø43.6
Indicative values for Ø43.6 mm
| Material group (ISO 513) | Vc [m/min] | fz [mm/tooth] | n [rpm] Ø43.6 |
|---|---|---|---|
| PStructural and carbon steel | 8–10 | 0.28–0.40 | 58 |
| MStainless steel | 2–3 | 0.28–0.40 | 15 |
| KCast iron | 3–5 | 0.28–0.40 | 22 |
| NAluminum and light alloys | 12–16 | 0.32–0.40 | 88 |
Vc — cutting speed, fz — feed per tooth (catalog values for HSS, selected for a diameter of Ø43.6 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 Ø43.6 for metal
Rough machining of holes before finish reaming
Long taper-shank roughing reamer Ø43.6 for metal — NRTb shank-type roughing reamer with Morse taper shank MT3 and spiral (helical) flutes, made of high-speed steel HSS. The long version facilitates machining of deep through and blind holes — it removes larger stock allowances and prepares the hole for a finishing reamer. The tool has a ~45° lead-in chamfer at the tip for centered entry, while the guiding margins on the cutting edges keep the tool aligned with the hole axis. Spiral flutes evacuate chips efficiently — the left-hand spiral version pushes them toward the exit, which benefits blind holes.
The Ø43.6 roughing reamer for metal straightens the hole after drilling: it corrects form errors, aligns the hole axis, and leaves a uniform stock allowance for finishing. Diameter 43.6 mm corresponds to a finished hole of Ø44 H7 (allowance of approx. 0.4 mm on the diameter). Cutting edges with large flutes evacuate chips efficiently when removing larger stock allowances, while HSS withstands demanding cutting conditions. Larger diameters are used for bearing and bushing seats and holes in machine housings, where consistent dimensions along the entire length are essential.
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 Ø44 H7 — stock allowance of 0.4 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 Ø43.6
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 43.6 mm diameter is selected for a finished hole of Ø44 H7 — after rough reaming, an allowance of approx. 0.4 mm remains on the diameter for the finishing reamer.
When the hole is deep or difficult to access — the long cutting section and spiral (helical) flutes facilitate tool guidance and chip evacuation. For shallow holes, the short NRTa provides greater rigidity.
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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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