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Description
Cutting diameter DØ12 H7hole 12.000–12.018 mm
MaterialHSShigh-speed steel (HSS)
StandardDIN 206hand reamer
Number of cutting edgesZ = 8straight flutes
Technical data for the 12 H7 hand reamer
dimensions, standard, and shank specifications
| Technical data | |
|---|---|
| Cutting diameter D | Ø12 H7 · hole 12.000–12.018 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 | 76 mm |
| Shank length l₁ | 56 mm |
| Overall length L | 152 mm |
| Number of cutting edges Z | 8 (helical flutes) |
| Shank / drive | Straight shank with square drive (for a tap wrench) |
Hand reamer 12 H7 NRTh — characteristics
construction, operation, and applications
Fixed-size, shank-type hand reamer 12 H7 NRTh to DIN 206 finishes cylindrical Ø12 holes. It brings them to grade H7 (12.000–12.018 mm), removing a thin layer of a few hundredths of a millimeter from the wall — the hole achieves an accurate size, better roundness, and lower roughness.
The reamer is made of high-quality Polish-made high-speed steel (HSS). A set of 8 straight cutting edges distributes cutting forces over multiple edges, maintaining hole roundness and avoiding the vibration typical of a two-lip drill. The tapered lead guides the tool concentrically into the pilot hole, while the straight shank ending in a square drive engages with a tap wrench.
This is a machining operation for finishing operation, not roughing. Drilling alone produces a hole of grade IT10–IT11; the reamer is intended to tighten its tolerance to H7 and smooth the wall. Important: the reamer follows the hole and cannot correct misalignment, so drill the pilot hole perpendicularly and on-axis. Unlike the machine version, the hand version has a longer tapered lead and more cutting edges, making it easier to guide under less rigid operating conditions. It is used for locating holes in housings and fixtures, where dimensional repeatability translates into assembly accuracy.
H7 tolerance and Ø12 hole accuracy
final tolerance zone of the machined hole
Ø12 mm hole size by tolerance grade (ISO 286)
| Designation | Hole Ø range [mm] | Deviations [mm] | IT tolerance grade |
|---|---|---|---|
| 12 H6 | 12.000 – 12.011 | +0.011 / 0 | 11 µm |
| 12 H7 | 12.000 – 12.018 | +0.018 / 0 | 18 µm this product |
| 12 H8 | 12.000 – 12.027 | +0.027 / 0 | 27 µm |
| 12 H9 | 12.000 – 12.043 | +0.043 / 0 | 43 µm |
| 12 H11 | 12.000 – 12.110 | +0.110 / 0 | 110 µm |
Your reamer produces tolerance grade H7 — finished hole Ø12.000–12.018 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 Ø12 H7
tap wrench operation, allowance and predrilled hole
The reamer is secured in a tap wrench by the square drive of the shank and operated by hand — with steady rotation in one direction and light, even pressure. For reaming to Ø12 H7, leave a 0.2–0.3 mm allowance on diameter: drill the pilot hole with a drill of Ø11.7 mm, then ream to the final size. Maintain moderate, even pressure and do not reverse rotation while cutting. Lubricate generously with cutting oil — it reduces cutting resistance and improves the surface finish to Ra 0.4–1.6 µm (drilling alone leaves 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
Unalloyed and free-machining steel, nonferrous metals (brass, bronze, copper), and light alloys — materials in group P1.2–P1.3. The HSS cutting edges provide durability during hand operation, but the tool is not intended for hardened steel or hardened stainless steel.
It means the hole is produced within 12.000–12.018 mm — upper deviation +0.018 / 0 mm, without falling below the nominal size. Reaming also produces a smooth wall with Ra 0.4–1.6 µm.
Yes — drill Ø11.7 mm, leaving a stock allowance of 0.2–0.3 mm on the diameter. The reamer is a finishing tool and removes only a thin layer; it cannot replace drilling from solid.
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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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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