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Description
Cutting diameter DØ16.5 H7hole 16.500–16.518 mm
MaterialHSShigh-speed steel (HSS)
StandardDIN 206hand reamer
Number of cutting edgesZ = 8straight flutes
Technical data for the 16.5 H7 hand reamer
dimensions, standard, and shank specifications
| Technical data | |
|---|---|
| Cutting diameter D | Ø16.5 H7 · hole 16.500–16.518 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 16.5 H7 NRTh — characteristics
construction, operation, and applications
Shank-type hand reamer 16.5 H7 NRTh to DIN 206 is used to finish cylindrical Ø16.5 holes. Its purpose is to bring the hole into the tight tolerance zone H7 (16.500–16.518 mm): it removes a stock allowance of a few hundredths of a millimeter while improving roundness and wall smoothness.
The tool is made of high-quality Polish-made high-speed steel (HSS), giving the cutting edges high hardness and wear resistance — they retain their size for a long time. The cutting section has 8 straight cutting edges that distribute cutting resistance over multiple edges, resulting in a rounder hole and smoother operation than with a drill. The tapered lead centers the reamer, and the straight shank with a square drive connects to a tap wrench.
The operation is intended for finishing operation, not roughing. Drilling leaves a hole of grade IT10–IT11, while the reamer brings it to H7 and improves the wall finish. Bear in mind that a reamer follows the hole and will not correct a crooked hole, so the initial hole should be perpendicular to the surface and on axis. Unlike a machine reamer, the hand model has a longer lead taper and more cutting edges — making even cutting easier. It is used for locating holes in housings and fixtures, where dimensional repeatability translates into assembly accuracy.
H7 tolerance and Ø16.5 hole accuracy
final tolerance zone of the machined hole
Ø16.5 mm hole size by tolerance grade (ISO 286)
| Designation | Hole Ø range [mm] | Deviations [mm] | IT tolerance grade |
|---|---|---|---|
| 16.5 H6 | 16.500 – 16.511 | +0.011 / 0 | 11 µm |
| 16.5 H7 | 16.500 – 16.518 | +0.018 / 0 | 18 µm this product |
| 16.5 H8 | 16.500 – 16.527 | +0.027 / 0 | 27 µm |
| 16.5 H9 | 16.500 – 16.543 | +0.043 / 0 | 43 µm |
| 16.5 H11 | 16.500 – 16.610 | +0.110 / 0 | 110 µm |
Your reamer produces tolerance grade H7 — finished hole Ø16.500–16.518 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 Ø16.5 H7
tap wrench operation, allowance and predrilled hole
The tap wrench fits over the square drive of the straight shank; guide the reamer by hand with a steady motion in one direction, without jerking. Before machining to Ø16.5 H7, leave a 0.2–0.3 mm allowance on diameter and drill a pilot hole Ø16.2 mm, and finish with a reamer. Apply moderate, even pressure and do not reverse the direction of rotation while cutting. Use generous lubrication — cutting oil reduces resistance and improves the surface finish to Ra 0.4–1.6 µm (drilling produces approximately 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
For ordinary unalloyed steels, free-machining steels, nonferrous metals, and light alloys — yes. Avoid hardened steels and hardened stainless steels, as they exceed the capabilities of HSS. The intended materials are in group P1.2–P1.3.
The H7 zone, or +0.018 / 0 mm — the finished hole measures 16.500–16.518 mm. Grade H7 is a typical precision fit; after reaming, roughness is within Ra 0.4–1.6 µm.
Drill it with a Ø16.2 mm drill (stock allowance of 0.2–0.3 mm on the diameter), perpendicular to the surface. Ream slowly in one direction with generous lubrication — this ensures the H7 tolerance zone and low roughness.
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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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