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Description
Cutting diameter DØ11 H7hole 11.000–11.018 mm
MaterialHSShigh-speed steel (HSS)
StandardDIN 206hand reamer
Number of cutting edgesZ = 8straight flutes
Technical data for the 11 H7 hand reamer
dimensions, standard, and shank specifications
| Technical data | |
|---|---|
| Cutting diameter D | Ø11 H7 · hole 11.000–11.018 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 | 71 mm |
| Shank length l₁ | 51 mm |
| Overall length L | 142 mm |
| Number of cutting edges Z | 8 (straight flutes) |
| Shank / drive | Straight shank with square drive (for a tap wrench) |
Hand reamer 11 H7 NRTh — characteristics
construction, operation, and applications
Hand reamer 11 H7 NRTh conforming to DIN 206 is a shank-type finishing tool for cylindrical holes. After drilling, it brings a Ø11 hole to the precise tolerance grade H7 (11.000–11.018 mm) — it removes a small allowance around the entire circumference, improving the hole size, roundness and surface finish.
The tool body is made of high-grade high-speed steel (HSS) produced in Poland. The cutting section has straight flutes and 8 cutting edges: more edges distribute cutting forces more evenly, improving hole roundness and reducing vibration compared with a two-edge drill bit. The extended lead taper centers the reamer in the hole, while the square drive on the shank transmits torque from the tap wrench.
Reaming is a finishing operation, not a roughing operation. After drilling, the hole falls within the broad IT10–IT11 tolerance range; the reamer tightens its tolerance to H7, while also improving the wall finish. Note that the tool follows the existing hole and will not straighten a crooked hole — the initial hole must therefore be drilled perpendicular to the surface. Unlike a machine reamer, the hand version has an extended lead taper and more cutting edges, promoting even cutting. The tool makes it easier to size holes for plain bearing bushings, where tolerance grade H7 determines the correct fit and operation of the assembly.
H7 tolerance and Ø11 hole accuracy
final tolerance zone of the machined hole
Ø11 mm hole size by tolerance grade (ISO 286)
| Designation | Hole Ø range [mm] | Deviations [mm] | IT tolerance grade |
|---|---|---|---|
| 11 H6 | 11.000 – 11.011 | +0.011 / 0 | 11 µm |
| 11 H7 | 11.000 – 11.018 | +0.018 / 0 | 18 µm this product |
| 11 H8 | 11.000 – 11.027 | +0.027 / 0 | 27 µm |
| 11 H9 | 11.000 – 11.043 | +0.043 / 0 | 43 µm |
| 11 H11 | 11.000 – 11.110 | +0.110 / 0 | 110 µm |
Your reamer produces tolerance grade H7 — finished hole Ø11.000–11.018 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 Ø11 H7
tap wrench operation, allowance and predrilled hole
The reamer engages with the tap wrench through the square drive on the shank — guide it by hand, steadily and in one direction, with moderate pressure. For Ø11 H7, leave a 0.2–0.3 mm allowance on diameter; predrill the hole with a drill of Ø10.7 mm, and finish with a reamer. Apply moderate, even pressure and do not reverse the direction of rotation while cutting. Generous lubrication with cutting oil is essential — it reduces resistance and improves the surface finish to Ra 0.4–1.6 µm (approx. 1.6–3.2 µm after drilling).
▲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
Yes — nonferrous metals and light alloys (brass, bronze, copper, aluminum) are among the recommended materials in group P1.2–P1.3, alongside unalloyed and free-machining steels. The limitations are hardened steels and hardened stainless steels, for which HSS is too soft.
The hole size falls within 11.000–11.018 mm (H7, +0.018 / 0 mm), and roughness drops to Ra 0.4–1.6 µm. By comparison, drilling alone leaves approx. 1.6–3.2 µm and a much looser IT10–IT11 tolerance grade.
The optimum diametral allowance is 0.2–0.3 mm. Drill the initial hole with a Ø10.7 mm drill bit; excessive allowance impairs the surface finish and loads the cutting edges, while insufficient allowance will not remove drilling marks.
Product accessories
Set of metal drill bits 1-13 HSSE Inox DIN 338
Reference: 0000005480 In stock > 10 items
€50.00
€61.50 brutto
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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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