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Description
Cutting diameter DØ19 H7hole 19.000–19.021 mm
MaterialHSShigh-speed steel (HSS)
StandardDIN 206hand reamer
Number of cutting edgesZ = 10straight flutes
Technical data for the 19 H7 hand reamer
dimensions, standard, and shank specifications
| Technical data | |
|---|---|
| Cutting diameter D | Ø19 H7 · hole 19.000–19.021 mm |
| Hole tolerance zone | H7 (+0.021 / 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 | 10 (straight flutes) |
| Shank / drive | Straight shank with square drive (for a tap wrench) |
Hand reamer 19 H7 NRTh — characteristics
construction, operation, and applications
This hand reamer 19 H7 NRTh (DIN 206) is a shank-type finishing tool for cylindrical holes. It is used for precision sizing of a Ø19 hole: it removes a few hundredths of a millimeter on diameter and brings the hole into the tolerance zone H7 (19.000–19.021 mm), while smoothing the hole wall and improving roundness.
The reamer is made of high-quality Polish-made high-speed steel (HSS). Its 10 straight cutting edges distribute cutting resistance over more edges — the key to good hole roundness and operation without the vibration typical of a drill. The slightly tapered lead facilitates self-centering, while the straight shank with square drive allows the tool to be operated with a tap wrench.
Reaming is a finishing operation, not a roughing operation. Drilling alone leaves the hole in a loose tolerance grade (around IT10–IT11), and only the reamer brings it to H7 and smooths 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 and on axis. Unlike a machine reamer, a hand reamer has a longer lead taper and more cutting edges, making even cutting easier under the less rigid conditions of manual machining. It is often used to prepare holes in machine tooling, where locating components require a repeatable fit.
H7 tolerance and Ø19 hole accuracy
final tolerance zone of the machined hole
Ø19 mm hole size by tolerance grade (ISO 286)
| Designation | Hole Ø range [mm] | Deviations [mm] | IT tolerance grade |
|---|---|---|---|
| 19 H6 | 19.000 – 19.013 | +0.013 / 0 | 13 µm |
| 19 H7 | 19.000 – 19.021 | +0.021 / 0 | 21 µm this product |
| 19 H8 | 19.000 – 19.033 | +0.033 / 0 | 33 µm |
| 19 H9 | 19.000 – 19.052 | +0.052 / 0 | 52 µm |
| 19 H11 | 19.000 – 19.130 | +0.130 / 0 | 130 µm |
Your reamer produces tolerance grade H7 — finished hole Ø19.000–19.021 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 Ø19 H7
tap wrench operation, allowance and predrilled hole
The tool is driven by a tap wrench fitted over the square drive on the shank; turn the tool evenly in one direction, applying light, continuous pressure. For Ø19 H7, allow a 0.2–0.3 mm allowance on diameter — predrilled hole Ø18.7 mm, and finish with a hand reamer. Apply moderate, even pressure and do not reverse the direction of rotation while cutting. Lubricate generously: cutting oil reduces resistance and allows surface roughness down to Ra 0.4–1.6 µm compared with approx. 1.6–3.2 µm after drilling alone.
▲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
Metals in group P1.2–P1.3: unalloyed and free-machining steel, nonferrous metals (brass, bronze, copper) and light alloys. HSS cutting edges handle these materials well; do not use the tool on hardened steel or hardened stainless steel.
The upper deviation is +0.021 / 0 mm — the hole is no smaller than 19.000 mm and no larger than 19.021 mm. Reaming also provides a smooth surface of Ra 0.4–1.6 µm, better than drilling.
Use a Ø18.7 mm drill bit — this leaves a diametral reaming allowance of 0.2–0.3 mm. Remove the remaining stock with a hand reamer, guiding it steadily and lubricating generously.
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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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