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Description
Diameter D Ø55.2 mm
Tolerance h855.154–55.200 mm
Mounting Hole Ø27 mmtaper 1:30
Material HSS
Shell roughing reamer Ø55.2 for metal — technical data
NRNa — shell roughing reamer, HSS DIN 222
| Technical Data | |
|---|---|
| Cutting diameter D (h8) | Ø55.2 mm (55.154–55.200 mm) |
| Mounting bore diameter d (taper 1:30) | 27 mm |
| Overall length L | 71 mm |
| Number of teeth Z | 4 |
| Type | NRNa — shell roughing reamer |
| Dimensional standard | DIN 222 |
| Material | HSS (high-speed steel) |
Manufacturing tolerance h8 for a diameter of 55.2 mm
| Class | Deviations [mm] | Dimension [mm] | |
|---|---|---|---|
| h8 | 0 / −0.046 | 55.154 – 55.200 | VERSION |
Cutting diameter 55.2 mm prepares the hole for a finishing reamer Ø55.5 H7 — the roughing reamer leaves an allowance of approx. 0.3 mm on the diameter for finish reaming.
Cutting data for the Ø55.2 shell roughing reamer
Indicative values Ø55.2 mm Z = 4
| Material group (ISO 513) | Vc [m/min] | fz [mm/tooth] | n [rpm] Ø55.2 | f [mm/min] Z=4 |
|---|---|---|---|---|
| PStructural and carbon steel | 8–10 | 0.28–0.40 | 46 | 52 |
| MStainless steel | 2–3 | 0.28–0.40 | 12 | 13 |
| KCast iron | 3–5 | 0.28–0.40 | 17 | 19 |
| NAluminum and light alloys | 12–16 | 0.32–0.40 | 69 | 88 |
Vc — cutting speed, fz — feed per tooth (catalog values for HSS, selected for a diameter of Ø55.2 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 = 4. Start with the lower values and adjust according to the material and clamping rigidity.
You may also need: Cutting parameters calculator
Applications of the Ø55.2 shell roughing reamer (preliminary reamer) for metal
Rough machining of holes before finish reaming
Shell roughing reamer Ø55.2 for metal — NRNa shell roughing reamer according to DIN 222 made of high-speed steel (HSS) HSS, mounted on an arbor through a tapered mounting bore Ø27 mm (1:30). The shell design allows economical machining of larger-diameter holes — one arbor accommodates multiple heads. 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.
The Ø55.2 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 55.2 mm corresponds to a finished hole of Ø55.5 H7 (allowance of approx. 0.3 mm on the diameter). 4 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 Ø55.5 H7 — stock allowance of 0.3 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 Ø55.2
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 55.2 mm diameter is selected for a finished hole of Ø55.5 H7 — after rough reaming, an allowance of approx. 0.3 mm remains on the diameter for the finishing reamer.
At larger diameters, a shell head is less expensive and lighter than a shank-type tool, and one arbor accommodates multiple diameters — an economical solution for workshops and maintenance.
Product accessories
Finishing shell reamer 55 H7 NRNb DIN 219A HSS
Reference: 2656 In stock > 10 items
€60.53
€74.45 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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