Diamond honing reamers combine the rigid positioning of reaming with the high surface precision of honing. Designed for high-precision, mass-production machining of internal bores, they achieve IT5–IT6 tolerances and roundness within 1–2 μm — in a single pass, even on hard materials, thin-walled parts, and interrupted bores with keyways or cross-holes.
A diamond honing reamer merges two processes in one tool: the rigid, self-positioning character of reaming and the fine surface quality of honing. The diamond abrasive working section removes a small, controlled amount of material while guiding steadily in the bore, which makes the tool especially well suited to high-precision batch production of internal cylindrical surfaces.
Our adjustable honing reamers add a built-in sizing function to this process:
The tool consists of a tapered arbor and a slotted abrasive sleeve. Tightening the end nut moves the sleeve along the taper, micro-adjusting the outer diameter by a few to a few tens of microns.
● Compensates for abrasive wear during production, instead of scrapping an oversized tool
● Extends usable tool life and lowers cost per part
● Holds bore dimensions precisely inside tight tolerance bands
Diamond honing reamers are a strong fit wherever bore diameter, roundness, and surface finish must be held in volume production:
| Industry | Typical Workpieces |
| Hydraulics & pneumatics | Control and proportional valve bodies, plunger pump bodies, hydraulic cylinders, pneumatic cylinders |
| Automotive & fuel systems | Fuel injector nozzle valve bodies, connecting rod ends, steering gear housings, brake master and wheel cylinders |
| Refrigeration compressors | Cylinder bores, piston bores, and bearing seats for AC and refrigerator compressors |
| Gears & transmission | High-precision gear bores and reducer bearing seats |
| Hard-to-machine materials | Carbide dies, hardened steel parts, precision ceramic bushings, powder metallurgy components |
The decisive advantage of our diamond honing reamers shows on the difficult jobs:
● Hard materials — diamond abrasive finishes hardened steel, carbide, ceramics, and powder metallurgy parts that conventional reamers struggle with
● Thin-walled parts — low, evenly distributed cutting pressure avoids distorting delicate bores
● Interrupted bores — stable results on holes with keyways or cross-holes, where a rigid reamer would be deflected
● Precision class — IT5–IT6 tolerances and roundness of 1–2 μm
Diamond honing reamers are mounted through a floating tool holder, which allows the tool to self-center in the bore and absorb slight misalignment between spindle and workpiece. They are primarily applied on horizontal and vertical single-pass honing machines as well as high-precision reaming machines, fitting seamlessly into existing batch-production lines.
For manufacturers who need IT5–IT6 bore accuracy at production volume, diamond honing reamers replace slow, multi-step processes with one stable, single-pass operation. Our adjustable honing reamers go one step further: the tapered-arbor design keeps bore size on target throughout the tool's life, part after part.
Tell us your bore diameter, material, hardness, and tolerance requirements, and our engineering team will recommend the right honing reamer configuration for your workpieces and machine.
A tool that combines the rigid positioning of reaming with the high surface precision of honing. It finishes internal bores in a single pass, making it ideal for high-precision mass production.
IT5–IT6 grade tolerances with roundness within 1–2 μm, even on hard materials, thin-walled parts, and interrupted bores with keyways or cross-holes.
Its tapered arbor and slotted sleeve allow the outer diameter to be micro-adjusted by a few to a few tens of microns. This compensates for abrasive wear, extends tool life, and keeps bore size precisely within the tolerance band.
They are mounted via a floating tool holder for self-centering alignment and are primarily used on horizontal/vertical single-pass honing machines and high-precision reaming machines.
