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Description
Diameter D Ø7 mm
Tolerance H77.000–7.015 mm
Morse taper MT1
Material HSS
Taper shank machine reamer Ø7 H7 for metal — technical data
NRTc — shank-type finishing reamer, Morse taper shank, HSS DIN 208
| Technical Data | |
|---|---|
| Cutting diameter D | Ø7 H7 (7.000–7.015 mm) |
| Morse taper | MT1 |
| Flute length l | 31 mm |
| Overall length L | 150 mm |
| Number of teeth Z | 6 |
| Type | NRTc — shank-type finishing reamer, Morse taper shank |
| Dimensional standard | DIN 208 |
| Material | HSS (high-speed steel) |
What H7 tolerance means for a diameter of 7 mm
| Class | Deviations [mm] | Dimension [mm] | |
|---|---|---|---|
| H6 | +0.009 / 0 | 7.000 – 7.009 | |
| H7 | +0.015 / 0 | 7.000 – 7.015 | SELECTED |
| H8 | +0.022 / 0 | 7.000 – 7.022 | |
| H9 | +0.036 / 0 | 7.000 – 7.036 |
The reamed hole falls within the tolerance zone 7.000–7.015 mm (ISO 286-2) — an accuracy level typical of dowel pin holes and sliding fits, among other applications.
Cutting data for the machine reamer Ø7 H7
Indicative values Ø7 mm Z = 6
| Material group (ISO 513) | Vc [m/min] | fz [mm/tooth] | n [rpm] Ø7 | f [mm/min] Z=6 |
|---|---|---|---|---|
| PStructural and carbon steel | 8–10 | 0.08–0.12 | 364 | 175 |
| MStainless steel | 2–3 | 0.08–0.12 | 91 | 44 |
| KCast iron | 3–5 | 0.10–0.14 | 136 | 82 |
| NAluminum and light alloys | 12–16 | 0.12–0.16 | 546 | 393 |
Vc — cutting speed, fz — feed per tooth (catalog values for HSS, selected for a diameter of Ø7 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 = 6. Start with the lower values and adjust according to the material and clamping rigidity.
You may also need: Cutting parameters calculator
Applications of the Ø7 H7 machine reamer
Hole finishing to H7 tolerance
Machine reamer Ø7 H7 for metal with a taper shank Morse MT1 — NRTc shank-type finishing reamer according to DIN 208 made of high-speed steel (HSS) HSS. The taper shank provides secure, concentric mounting directly in the spindle socket or in a reduction sleeve — on lathes, milling machines, drilling machines, and CNC machine tools. 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 Ø7 H7 for metal removes the allowance left after drilling and brings the hole to its final size within the tolerance zone H7 (7.000–7.015 mm). The tool aligns the hole axis, improves roundness and cylindricity, and reduces surface roughness to approx. Ra 0.4–1.6 µm. 6 unequally spaced cutting edges reduce vibration and machining marks. This diameter range is commonly used for sliding fits: pins, shafts, plain bushings, and dowel pin holes in housings. Suitable for reaming 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 Ø6.8 mm — stock allowance of 0.2 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 — Ø7 H7 reamer
Drill a hole Ø6.8 mm — stock allowance of approx. 0.2 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 7.000–7.015 mm, and surface roughness is approx. Ra 0.4–1.6 µm — this accuracy is sufficient for sliding fits and dowel pin holes.
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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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