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Roughing reamer 12.8 NRTb HSS
€21.04 tax inc.
Net price: €17.11
Description
Diameter D Ø12.8 mm
Tolerance h812.773–12.800 mm
Morse taper MT1
Material HSS
Long taper-shank roughing reamer Ø12.8 for metal — technical data
NRTb — long shank-type roughing reamer, spiral flutes, HSS
| Technical Data | |
|---|---|
| Cutting diameter D (h8) | Ø12.8 mm (12.773–12.800 mm) |
| Morse taper | MT1 |
| Flute length l | 101 mm |
| Overall length L | 182 mm |
| Type | NRTb — long shank-type roughing reamer, spiral flutes |
| Material | HSS (high-speed steel) |
Manufacturing tolerance h8 for a diameter of 12.8 mm
| Class | Deviations [mm] | Dimension [mm] | |
|---|---|---|---|
| h8 | 0 / −0.027 | 12.773 – 12.800 | VERSION |
Cutting diameter 12.8 mm prepares the hole for a finishing reamer Ø13 H7 — the roughing reamer leaves an allowance of approx. 0.2 mm on the diameter for finish reaming.
Cutting data for the roughing reamer Ø12.8
Indicative values for Ø12.8 mm
| Material group (ISO 513) | Vc [m/min] | fz [mm/tooth] | n [rpm] Ø12.8 |
|---|---|---|---|
| PStructural and carbon steel | 8–10 | 0.12–0.16 | 199 |
| MStainless steel | 2–3 | 0.12–0.16 | 50 |
| KCast iron | 3–5 | 0.14–0.16 | 75 |
| NAluminum and light alloys | 12–16 | 0.16–0.20 | 298 |
Vc — cutting speed, fz — feed per tooth (catalog values for HSS, selected for a diameter of Ø12.8 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 Ø12.8 for metal
Rough machining of holes before finish reaming
Long taper-shank roughing reamer Ø12.8 for metal — NRTb shank-type roughing reamer with Morse taper shank MT1 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 Ø12.8 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 12.8 mm corresponds to a finished hole of Ø13 H7 (allowance of approx. 0.2 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 Ø13 H7 — stock allowance of 0.2 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 Ø12.8
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 12.8 mm diameter is selected for a finished hole of Ø13 H7 — after rough reaming, an allowance of approx. 0.2 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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