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Finishing shell reamer 48 H7 NRNb DIN 219 HSS
1274
€61.50 tax inc.
Net price: €50.00
Description
Diameter D Ø48 mm
Tolerance H748.000–48.025 mm
Mounting Hole Ø22 mmtaper 1:30
Material HSS
Shell reamer Ø48 H7 for metal — technical data
NRNb — HSS shell finishing reamer DIN 219
| Technical Data | |
|---|---|
| Cutting diameter D | Ø48 H7 (48.000–48.025 mm) |
| Mounting bore diameter d (taper 1:30) | 22 mm |
| Flute length l | 45 mm |
| Overall length L | 63 mm |
| Number of teeth Z | 12 |
| Type | NRNb — shell finishing reamer |
| Dimensional standard | DIN 219 |
| Material | HSS (high-speed steel) |
What H7 tolerance means for a diameter of 48 mm
| Class | Deviations [mm] | Dimension [mm] | |
|---|---|---|---|
| H6 | +0.016 / 0 | 48.000 – 48.016 | |
| H7 | +0.025 / 0 | 48.000 – 48.025 | SELECTED |
| H8 | +0.039 / 0 | 48.000 – 48.039 | |
| H9 | +0.062 / 0 | 48.000 – 48.062 |
The reamed hole falls within the tolerance zone 48.000–48.025 mm (ISO 286-2) — an accuracy level typical of dowel pin holes and sliding fits, among other applications.
Cutting data for the shell reamer Ø48 H7
Indicative values Ø48 mm Z = 12
| Material group (ISO 513) | Vc [m/min] | fz [mm/tooth] | n [rpm] Ø48 | f [mm/min] Z=12 |
|---|---|---|---|---|
| PStructural and carbon steel | 8–10 | 0.28–0.40 | 53 | 178 |
| MStainless steel | 2–3 | 0.28–0.40 | 13 | 44 |
| KCast iron | 3–5 | 0.28–0.40 | 20 | 67 |
| NAluminum and light alloys | 12–16 | 0.32–0.40 | 80 | 307 |
Vc — cutting speed, fz — feed per tooth (catalog values for HSS, selected for a diameter of Ø48 mm). Spindle speeds were calculated for the lower end of the range: n = (Vc × 1000) ÷ (π × D), feed rate per minute f = fz × Z × n for Z = 12. Start with the lower values and adjust according to the material and clamping rigidity.
You may also need: Cutting parameters calculator
Applications of the shell reamer Ø48 H7
Hole finishing to H7 tolerance
Shell reamer Ø48 H7 for metal — NRNb shell finishing reamer according to DIN 219 made of high-speed steel (HSS) HSS, mounted on an arbor through a tapered mounting bore Ø22 mm (1:30). The shell design allows economical finishing of large-diameter holes to tolerance H7 — one arbor accommodates multiple heads. 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 48 H7 shell reamer for metal removes the allowance left after drilling and brings the hole to its final size within the tolerance zone H7 (48.000–48.025 mm). The result is a corrected axis, improved hole roundness and cylindricity, and surface roughness of approx. Ra 0.4–1.6 µm. 12 unequally spaced cutting edges reduce vibration and machining marks. Larger diameters are used for bearing and bushing seats and holes in machine housings, where dimensional stability over the entire length is essential. Suitable as a reamer for steel, cast iron, and nonferrous metals — HSS retains its hardness and wear resistance even at elevated cutting temperatures.
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
- Pre-drilled hole Ø47.6 mm — stock allowance of 0.4 mm on the diameter.
- Drill the initial hole perpendicular to the surface and with minimal runout — a finishing reamer follows the existing hole and will not correct its misalignment.
- 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 — Ø48 H7 reamer
Drill a hole Ø47.6 mm — stock allowance of approx. 0.4 mm on the diameter. Too little allowance causes the material to be compressed rather than cut; too much overloads the cutting edges and reduces hole accuracy.
On a shell reamer arbor with a 1:30 taper and a Ø22 mm spigot, with a Morse taper shank at the other end. The arbor drive transmits torque to the head.
The hole falls within the tolerance zone 48.000–48.025 mm, and surface roughness is approx. Ra 0.4–1.6 µm — this accuracy is sufficient for sliding fits and dowel pin holes.
Product accessories
Roughing shell reamer 47.6 NRNa DIN 222 HSS
Reference: 2651 In stock > 10 items
€32.37
€39.81 brutto
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| 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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