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Description
Cutting diameter DØ17 H7hole 17.000–17.018 mm
MaterialHSShigh-speed steel (HSS)
StandardDIN 206hand reamer
Number of cutting edgesZ = 8straight flutes
Technical data for the 17 H7 hand reamer
dimensions, standard, and shank specifications
| Technical data | |
|---|---|
| Cutting diameter D | Ø17 H7 · hole 17.000–17.018 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 | 87 mm |
| Shank length l₁ | 60 mm |
| Overall length L | 175 mm |
| Number of cutting edges Z | 8 (straight flutes) |
| Shank / drive | Straight shank with square drive (for a tap wrench) |
Hand reamer 17 H7 NRTh — characteristics
construction, operation, and applications
Hand reamer 17 H7 NRTh (DIN 206) is a shank-type finishing reamer for cylindrical holes. It sizes a drilled Ø17 hole to the tolerance zone H7 (17.000–17.018 mm), removing a thin layer of material from the bore surface — a few hundredths of a millimeter on the diameter. In one pass, it improves the hole's dimensional accuracy, roundness, and surface finish.
The reamer is made from high-grade Polish HSS high-speed steel. Its 8 straight cutting edges each carry a lower cutting force — resulting in better hole roundness and reduced vibration compared with a drill with two cutting edges. The extended, slightly tapered lead helps align the tool with the axis of the predrilled hole, while the square drive on the shank transfers torque evenly from the tap wrench.
Reaming is a finishing operation, not a roughing operation. After drilling, the hole remains within a loose IT10–IT11 tolerance range, and the reamer improves its accuracy to H7 and smooths the surface. Bear in mind that the tool follows the existing hole and will not straighten a crooked hole — therefore, drill the initial hole perpendicular to the surface. Unlike a machine reamer, a hand reamer has a longer lead taper and more cutting edges, promoting even stock removal. It works well in reconditioning worn holes — light reaming restores their correct size and smoothness.
H7 tolerance and Ø17 hole accuracy
final tolerance zone of the machined hole
Ø17 mm hole size by tolerance grade (ISO 286)
| Designation | Hole Ø range [mm] | Deviations [mm] | IT tolerance grade |
|---|---|---|---|
| 17 H6 | 17.000 – 17.011 | +0.011 / 0 | 11 µm |
| 17 H7 | 17.000 – 17.018 | +0.018 / 0 | 18 µm this product |
| 17 H8 | 17.000 – 17.027 | +0.027 / 0 | 27 µm |
| 17 H9 | 17.000 – 17.043 | +0.043 / 0 | 43 µm |
| 17 H11 | 17.000 – 17.110 | +0.110 / 0 | 110 µm |
Your reamer produces tolerance grade H7 — finished hole Ø17.000–17.018 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 Ø17 H7
tap wrench operation, allowance and predrilled hole
The tool is driven by a tap wrench fitted over the square drive on the shank, turning it evenly in one direction with light, steady pressure. For a Ø17 H7 hole, allow a 0.2–0.3 mm allowance on diameter — predrill Ø16.7 mm, then ream by hand. Maintain moderate, even pressure and do not reverse rotation while cutting. Apply cutting oil generously: this reduces cutting resistance and produces a surface finish of Ra 0.4–1.6 µm, much smoother than after drilling (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
Primarily unalloyed and free-machining steels, nonferrous metals and light alloys (group P1.2–P1.3). Alloy steel can be machined with generous lubrication and low speeds. Hardened steels and hardened stainless steels are beyond the capabilities of HSS.
You will achieve an H7 hole, i.e. 17.000–17.018 mm (tolerance zone +0.018 / 0 mm). This is much tighter than drilling alone (IT10–IT11). The surface finish also improves to Ra 0.4–1.6 µm.
For this diameter, leave a 0.2–0.3 mm allowance and predrill a Ø16.7 mm hole. This allowance enables the reamer to remove an even layer, producing an accurate size and a smooth hole wall.
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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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