Carbide Slim Shank Machine Reamer H7 Precision CNC Reaming Tool for Steel & Stainless Steel

Short Description:

The Slim Shank Machine Reamer is a high-precision cutting tool designed to enlarge and finish pre-drilled holes with exceptional accuracy. It is manufactured from premium tungsten carbide (WC-Co) with optional HSS grade, featuring a slim shank that prevents tool interference, precision-ground flutes for smooth burr-free finishes, and machines hardened steels up to 60 HRC. Compatible with drill presses, lathes and CNC machines.

Product: Slim Shank Machine Reamer
Material: Tungsten carbide
Shank: Slim
Compatibility: Drill press, lathe, CNC machining center; standard collets & chucks

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Bullet Points

Full tungsten carbide (WC-Co) substrate delivers superior wear resistance — up to 5–8× longer tool life than HSS, cutting per-part cost in high-volume production.

Slim shank design eliminates tool/workpiece interference in deep holes, stepped holes and multi-axis machining — a unique advantage over standard reamers.

Sub-micron machining accuracy: H7 tolerance, Ra 0.4–0.8 μm finish, runout ≤0.005 mm — holes are ready to use without secondary operations.

Material-matched coatings (TiN/TiCN/TiAlN) reduce cutting heat and adhesive wear, extending tool life by an additional 30–50% on demanding materials.

Machines hardened steel up to 60 HRC, replacing grinding in many finish-hole applications and enabling one-setup production.

Applications

Mold Making：Precision reaming of guide-pin holes, ejector-pin holes and insert holes in mold bases to achieve H7 press/interference fits and mirror-smooth finishes.
Aerospace：Finishing critical holes in engine components, landing gear and structural parts; special coatings and angles are tailored for titanium and superalloys.
Automotive Parts：High-volume, consistent reaming of cylinder bores, cylinder heads, transmission housings and gear shaft holes on production lines.
General Metalworking：Enlarging and finishing holes in steel, stainless steel, aluminum alloy, cast iron and other metals with high dimensional accuracy.

Hot Q&A

What is the difference between a slim shank machine reamer and a standard reamer?

Answer: Unlike bulkier reamers, the slim (reduced) shank design is smaller than the cutting diameter, which prevents tool interference, reduces vibration and improves concentricity — ideal for deep holes and stepped holes.

Can this reamer machine hardened materials?

Answer: Yes. The carbide version excels at machining hardened steels up to 60 HRC; the HSS model is optimal for softer metals below 45 HRC. Please advise your workpiece material and hardness so we can recommend the best grade and coating.

What tolerance grades can you provide?

Answer: We supply H7, H8 and H9 standard grades and can customize down to ±0.005 mm per drawing. When ordering, please specify the hole diameter tolerance and required surface finish.

Which coatings are available?

Answer: iN (gold), TiCN (blue-gray), TiAlN/AlTiN (purple-black) and more. The coating is selected according to the workpiece material; it significantly improves tool life and hole surface quality.