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Description
Diameter D Ø58 mm
Tolerance H758.000–58.030 mm
Morse taper MT4
Material HSSE
Taper shank machine reamer Ø58 H7 for metal — technical data
NRTc — shank-type finishing reamer, Morse taper shank, HSSE DIN 208
| Technical Data | |
|---|---|
| Cutting diameter D | Ø58 H7 (58.000–58.030 mm) |
| Morse taper | MT4 |
| Flute length l | 90 mm |
| Overall length L | 360 mm |
| Number of teeth Z | 14 |
| Type | NRTc — shank-type finishing reamer, Morse taper shank |
| Dimensional standard | DIN 208 |
| Material | HSSE (cobalt high-speed steel) |
What H7 tolerance means for a diameter of 58 mm
| Class | Deviations [mm] | Dimension [mm] | |
|---|---|---|---|
| H6 | +0.019 / 0 | 58.000 – 58.019 | |
| H7 | +0.030 / 0 | 58.000 – 58.030 | SELECTED |
| H8 | +0.046 / 0 | 58.000 – 58.046 | |
| H9 | +0.074 / 0 | 58.000 – 58.074 |
The reamed hole falls within the tolerance zone 58.000–58.030 mm (ISO 286-2) — an accuracy level typical of dowel pin holes and sliding fits, among other applications.
Cutting data for the machine reamer Ø58 H7
Indicative values Ø58 mm Z = 14
| Material group (ISO 513) | Vc [m/min] | fz [mm/tooth] | n [rpm] Ø58 | f [mm/min] Z=14 |
|---|---|---|---|---|
| PStructural and carbon steel | 8–10 | 0.28–0.40 | 44 | 172 |
| MStainless steel | 2–3 | 0.28–0.40 | 11 | 43 |
| KCast iron | 3–5 | 0.28–0.40 | 16 | 63 |
| NAluminum and light alloys | 12–16 | 0.32–0.40 | 66 | 296 |
Vc — cutting speed, fz — feed per tooth (catalog values for HSS, selected for a diameter of Ø58 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 = 14. Start with the lower values and adjust according to the material and clamping rigidity. For an HSSE (cobalt) reamer, the cutting parameters can be increased by approx. 25% compared with HSS.
You may also need: Cutting parameters calculator
Applications of the machine reamer Ø58 H7 for metal
Hole finishing to H7 tolerance
Machine reamer Ø58 H7 for metal with a taper shank Morse MT4 — NRTc shank-type finishing reamer according to DIN 208 made of cobalt high-speed steel HSSE (approx. 5% Co). The taper shank provides secure, concentric mounting directly in the spindle socket or in a reduction sleeve — from lathes and milling machines to CNC machining centers. 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 Morse taper shank reamer Ø58 H7 for metal removes the allowance left after drilling and brings the hole to its final size within the tolerance zone H7 (58.000–58.030 mm). The result is a corrected axis, improved hole roundness and cylindricity, and surface roughness of approx. Ra 0.4–1.6 µm. 14 unequally spaced cutting edges reduce vibration and machining marks. Larger diameters are used for bearing and bushing seats and holes in machine housings, where consistent size over the full length is essential. Suitable for reaming steel, cast iron, and nonferrous metals — the cobalt content allows HSSE to retain hot hardness longer than standard HSS and perform more reliably in stainless steel.
Workpiece materials
✓Structural and carbon steel
✓Gray cast iron
✓Aluminum and nonferrous alloys
▲Stainless steels — cobalt-alloyed HSSE handles them significantly better than HSS; coolant is still recommended
✗Hardened steels above 45 HRC
Guidelines for correct reaming
- Pre-drilled hole Ø57.5 mm — stock allowance of 0.5 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 — Ø58 H7 reamer
Drill a hole Ø57.5 mm — stock allowance of approx. 0.5 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.
Use a Morse taper reduction sleeve — it allows the reamer to be mounted in a socket with a larger taper number without losing mounting concentricity.
The hole falls within the tolerance zone 58.000–58.030 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
Metal drill bit 29 NWKc HSS DIN 345 Baildon
Reference: 0397 In stock > 10 items
€26.32
€32.37 brutto
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