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Honing · Finish Honing Without a Machine · Ø 4-457 mm

Honing: the Right Flex-Hone® Tool for Finish and Cross-Hatch

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Honing here means defined roughness, cross-hatch and clean edges – not dimensional correction. That is exactly what the flexible honing tool is built for: self-centring in the drill chuck, reproducible on the CNC, in 10-45 seconds per bore.

  • Cross-hatch with an included angle of ~45° – for oil retention, ring seating and sealing surfaces
  • No honing machine needed: a drill chuck or cordless drill is enough – no setup, no fixture
  • Grits 20-800 plus diamond, abrasive matched to the material – standard sizes in stock

Enter the nominal size in mm – we show the matching size.

mm
Unsure about material, coating or tolerance? Request a tool recommendation
Already know your size? Straight to the size selection →
60+ years of experience
ISO 9001 certified production
3,000+ tools in stock
30 days payment terms on invoice

Best-Selling Flex-Hone® Honing Tools – In Stock

Grit 180 is the standard for ring seating and plateau finish, 240 for a finer target roughness. Silicon carbide (SC) for grey cast iron and steel – for aluminium and coatings, the finder guides you to the right abrasive.

Honing without investing in a machine: tools from 15.60 € net.

Sizing: order the nominal size of your bore – the oversize is built into the design. In-between size? Choose the next larger standard size.

All prices net plus VAT · Shipping within Germany from 5.90 €.

Flex-Hone oil (1 l)
Goes well with it: Flex-Hone oil (1 l) – 8.95 € net
View all sizes and grits in the shop →
Selection criteria

Where Do You Want to Hone?

Application Recommendation Next step
Engine cylinders (grey cast iron, steel, aluminium) 180-240 SC/AO Cylinder honing →
Nikasil, hard chrome, hardened (> 50 HRC) Diamond Nikasil honing →
Hydraulics, bushings, general engineering 180-240 SC from 15.60 € (8 mm) · 29.05 € (38 mm/180 SC)
Burrs on bores and intersections 60-120 SC Deburring →

All prices net plus VAT and shipping.

Tool finder

Enter your bore Ø – the matching Flex-Hone in 30 seconds

If diameter and material are settled, the finder leads straight to the matching Flex-Hone®. For coated bores, series production or drawing parts, the technical enquiry is the safe route.

  1. Enter the bore diameter
  2. Select the material
  3. Specify the target finish – get a directly orderable recommendation
Flex-Hone honing tool rotating in a CNC spindle

Honing means defined roughness.

Cross-hatch and plateau – reproducible in any spindle.

Finish Honing and Dimensional Honing: Two Processes, One Word

Two different processes go by the name of "honing". Classic dimensional honing works with rigid, positively guided honing stones on a honing machine and corrects size and form to the micrometre. Finish honing with the flexible tool comes in afterwards: it creates the functional surface – cross-hatch, plateau, deburred edges – and leaves size and geometry unchanged.

For most jobs in repair work and series-production finishing, that is exactly what is needed: no machine investment, no re-clamping, and a reproducible result that any employee can achieve after a short briefing.

Flex-Hone honing tools in various diameters
One design from 4 to 457 mm – the same mechanics for every bore size.

How the Cross-Hatch Is Created

The cross-hatch angle results from the ratio of rotational speed to stroke speed – an included angle of around 45° has proven effective. Recommended speeds by bore Ø: up to 12.7 mm at 1,000-1,200 rpm, up to 50 mm at 900-1,000, up to 95 mm at 600-900, larger bores slower – never above 1,200 rpm. Always work with oil or emulsion and stroke the rotating tool evenly; 5-12 double strokes are usually enough.

Macro shot of a uniform cross-hatch pattern
Uniform cross-hatch with a plateau component – the surface that rings and seals need.

The Right Size: Order the Nominal Bore Size

The Flex-Hone tool leaves the factory larger than its nominal size – this oversize creates the contact pressure of the abrasive globules. You simply order the nominal size of your bore; for in-between sizes, the next larger standard size (86 mm → 89 mm). Rules of thumb such as "add 10-20% oversize" lead to buying the wrong size.

Diagram: the order size is the nominal bore size – for in-between sizes, round up to the next standard size
  1. Tool slightly oversized from the factory (dashed) – the contact preload is built in. Therefore: order the nominal size, bore Ø 50 mm → tool 50 mm.
  2. Measured an in-between size (e.g. 86 mm)?
  3. Order the next larger standard size (89 mm) – never round down: a tool that is too small generates no contact pressure.

Your Application Has Its Own Page

Engine cylinders, coated liners and deburring jobs each have their own requirements for grit, abrasive and procedure – which is why we cover them on dedicated pages with a curated tool selection. The overview table above takes you to the right one in a single click.

Or use the selection assistant directly →
Related topics

Matching applications and guides

FAQ

Technical

Questions about tool, material and process

Can I hone without a honing machine?
Yes – that is exactly what the flexible tool is built for: it centres itself in the bore and runs in a drill chuck, cordless drill or CNC spindle. Size and form correction, however, remain the domain of the honing machine.
What speed should I hone at?
By bore Ø: up to 12.7 mm at 1,000-1,200 rpm, up to 50 mm at 900-1,000, up to 95 mm at 600-900, from 100 mm at 350-600 – never above 1,200 rpm. Enter and exit with the tool rotating, stroke evenly.
Which oil do I need?
A low-viscosity honing oil is ideal; mineral oil or motor oil and the CNC's coolant emulsion also work. Not suitable: WD-40 and solvents such as brake cleaner. Running dry drastically shortens tool life.
How long does honing a bore take?
In practice 10-45 seconds, or 5-12 double strokes. Honing for longer does not improve the result – once the cross-hatch is established, it only costs tool life.
Buying & advice

Terms, delivery and B2B handling

How much does a honing tool cost?
Standard sizes start at 15.60 € net; common sizes up to 51 mm are in the 19-32 € range, engine sizes (83-95 mm) at 54-62 €. Diamond versions for coatings from 20.15 €.
Do you ship from stock?
Yes – over 3,000 tools are held in stock in Germany; the specific dispatch date is shown in the stock status line on each item. Invoice with 30-day terms for business customers.
Which grit and which abrasive suit my application?
The selection assistant takes you from diameter, material and task to the right tool – no contact needed, in 30 seconds. For special cases, enquiries sent via the form are usually answered on the same working day.
Question not covered? Send us your part, bore size and a photo – you will usually get an answer within 24 h.
Request a tool recommendation Find your tool by size