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Machine reamer 3/4 inch H7 NRTc DIN 208
941121
€25.89 tax inc.
Net price: €21.05
Description
Diameter D 3/4″Ø19.050 mm
Tolerance H719.050–19.071 mm
Standard DIN 208
Material HSS
Taper-shank machine reamer 3/4 inch H7 for metal — technical data
NRTc — shank-type finishing reamer, Morse taper shank, HSS DIN 208
| Technical Data | |
|---|---|
| Cutting diameter D | 3/4 inch H7 (19.050–19.071 mm) |
| Flute length l | 62 mm |
| Overall length L | 230 mm |
| 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 19.05 mm
| Class | Deviations [mm] | Dimension [mm] | |
|---|---|---|---|
| H6 | +0.013 / 0 | 19.050 – 19.063 | |
| H7 | +0.021 / 0 | 19.050 – 19.071 | SELECTED |
| H8 | +0.033 / 0 | 19.050 – 19.083 | |
| H9 | +0.052 / 0 | 19.050 – 19.102 |
The reamed hole falls within the tolerance zone 19.050–19.071 mm (ISO 286-2) — an accuracy level typical of dowel pin holes and sliding fits, among other applications.
Cutting data for the 3/4 inch H7 machine reamer
Indicative values for Ø19.05 mm
| Material group (ISO 513) | Vc [m/min] | fz [mm/tooth] | n [rpm] Ø19.05 |
|---|---|---|---|
| PStructural and carbon steel | 8–10 | 0.16–0.20 | 134 |
| MStainless steel | 2–3 | 0.16–0.20 | 33 |
| KCast iron | 3–5 | 0.16–0.20 | 50 |
| NAluminum and light alloys | 12–16 | 0.20–0.24 | 201 |
Vc — cutting speed, fz — feed per tooth (catalog values for HSS, selected for a diameter of Ø19.05 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 3/4 inch H7 machine reamer for metal
Hole finishing to H7 tolerance
Machine reamer 3/4 inch H7 for metal with taper shank of the Morse type — 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 both conventional machine tools and 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 3/4 inch H7 reamer for metal with Morse taper shank removes the stock left after drilling and brings the hole to its final size within the tolerance zone H7 (19.050–19.071 mm). The tool aligns the hole axis, improves roundness and cylindricity, and reduces surface roughness to approx. Ra 0.4–1.6 µm. 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 Ø18.75 mm — stock allowance of 0.3 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 — 3/4 inch H7 reamer
Drill a hole Ø18.75 mm — stock allowance of approx. 0.3 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 19.050–19.071 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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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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