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Description
Cutting diameter DØ18 H7hole 18.000–18.018 mm
MaterialHSShigh-speed steel (HSS)
StandardDIN 206hand reamer
Number of cutting edgesZ = 8straight flutes
Technical data for the 18 H7 hand reamer
dimensions, standard, and shank specifications
| Technical data | |
|---|---|
| Cutting diameter D | Ø18 H7 · hole 18.000–18.018 mm |
| Hole tolerance zone | H7 (+0.018 / 0 mm) |
| Type | Fixed-size shank-type hand reamer |
| Dimensional standard | DIN 206 |
| Material | HSS (high-speed steel) |
| Flute length l | 93 mm |
| Shank length l₁ | 67 mm |
| Overall length L | 188 mm |
| Number of cutting edges Z | 8 (straight flutes) |
| Shank / drive | Straight shank with square drive (for a tap wrench) |
Hand reamer 18 H7 NRTh — characteristics
construction, operation, and applications
Hand reamer 18 H7 NRTh (DIN 206) is a tool for finishing Ø18 cylindrical holes. Operated by hand, it sizes a drilled hole to 18.000–18.018 mm within tolerance grade H7 — it removes only a thin layer, giving the hole an accurate size, correct roundness and low surface roughness.
The tool is made from high-grade Polish HSS high-speed steel, providing hard, durable cutting edges. The straight flutes accommodate 8 cutting edges; distributing the cut across this many edges improves hole roundness and dampens vibration compared with a two-edge drill. The tapered lead ensures concentricity, while the square drive on the straight shank fits into a tap wrench.
Reaming is classified as finishing, not roughing. A drilled hole falls within IT10–IT11, and the reamer tightens its tolerance to H7, while also smoothing the wall. Remember that the tool follows the existing hole and will not correct a crooked hole — drill the initial hole perpendicular to the surface. A hand reamer has a longer lead taper and more cutting edges than a machine reamer, making even cutting easier during manual feeding. It is useful when installing spring pins and press-fit components for which a precise tolerance zone is essential.
H7 tolerance and Ø18 hole accuracy
final tolerance zone of the machined hole
Ø18 mm hole size by tolerance grade (ISO 286)
| Designation | Hole Ø range [mm] | Deviations [mm] | IT tolerance grade |
|---|---|---|---|
| 18 H6 | 18.000 – 18.011 | +0.011 / 0 | 11 µm |
| 18 H7 | 18.000 – 18.018 | +0.018 / 0 | 18 µm this product |
| 18 H8 | 18.000 – 18.027 | +0.027 / 0 | 27 µm |
| 18 H9 | 18.000 – 18.043 | +0.043 / 0 | 43 µm |
| 18 H11 | 18.000 – 18.110 | +0.110 / 0 | 110 µm |
Your reamer produces tolerance grade H7 — finished hole Ø18.000–18.018 mm; the value is stated directly, without conversion from tables. A narrower tolerance zone means a more accurate hole. The reamed surface is smooth — typically Ra 0.4–1.6 µm, significantly better than after drilling alone (approx. 1.6–3.2 µm).
Manual machining — how to ream Ø18 H7
tap wrench operation, allowance and predrilled hole
The reamer is operated by hand, with a tap wrench fitted over the square drive on the shank and turned with an even, steady motion in one direction. For Ø18 H7, leave a 0.2–0.3 mm allowance on diameter: in practice, drill Ø17.7 mm, then remove the remaining stock with the reamer. Maintain moderate, even pressure and do not reverse rotation while cutting. Use plenty of cutting oil — generous lubrication reduces cutting resistance and produces a surface finish of Ra 0.4–1.6 µm, whereas drilling leaves approx. 1.6–3.2 µm.
▲Important: is a tool for manual machining — it is not intended for powered operation at high speeds. High-speed steel loses hardness above approx. 600 °C, so lubricate generously. Do not stop the reamer in the hole or reverse rotation — always withdraw it while continuing to rotate forward; withdrawing without rotation risks chip jamming, chipped cutting edges and a poorer hole finish.
Applications — workpiece materials
groups P1.2–P1.3 according to the material classification
✓Unalloyed and structural steel
✓Free-machining steel
✓Nonferrous metals — brass, bronze, copper
✓Light alloys and soft metals
▲Alloy steel — possible with generous lubrication and low speeds
✗Hardened steel and hardened stainless steel — beyond the capabilities of HSS
Frequently asked questions
It is suitable for unalloyed and free-machining steels, brass, bronze, copper and light alloys (P1.2–P1.3). When machining alloy steel, work slowly and lubricate generously. Hardened steel and hardened stainless steel are beyond the capabilities of an HSS tool.
H7 for Ø18 is 18.000–18.018 mm (+0.018 / 0 mm) — a narrower tolerance zone than H8 and H9, making the hole more accurate. A narrower tolerance means a tighter, more repeatable fit. The surface finish after reaming is Ra 0.4–1.6 µm.
Leave a stock allowance of 0.2–0.3 mm on the diameter. In practice, drill the pilot hole with a Ø17.7 mm drill, then hand-ream to the final size, lubricating generously with cutting oil.
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Shipping
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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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