Abrasive Flow Machine (AFM)

Function: What does it do?

Extrude honing, also known as abrasive flow machining, is a finishing process that uses a highly abrasive and viscous putty to polish, deburr, hone, and radius material in a single operation. Rather than using an abrasive stone as other honing operations do, an extrude hone pushes this putty back and forth through a controlled passage until it is forced out--thus the name.
Extrude Hone | Abrasive Flow Machine

Application & Benefit: What can I use it for? Why will it help me?

Common Industries

Aerospace     Automotive     Die-Casting     Plastic     Glass     Crystal     Vinyl     Aluminum

Common Processes

Extrude hones are most commonly used to remove burrs and thermal recast layers left behind by other secondary processes such as EDM or laser cutting. Users can expect to decrease roughness by 75-90%. 1

The abrasive flow machine can hone dozens of parts, holes, or passages at once, cutting down finishing times from hours of manual polishing to a 5-10 minute unmanned process. 2 It is also strong on consistency, evenness, and tight tolerance-holding.

Most importantly, the extrude hone can finish complex or otherwise inaccessible areas simultaneously and blindly, without the need to split, finish, and re-weld parts.

Other Uses 3:
  • 'Sizing' undersized die passages
  • Re-polishing used dies
  • Edge finishing
  • Freeing obstructions to maximize air, fuel, and exhaust velocity on aluminum intake manifolds & cylinder heads
  • Improving airfoil surface conditions
  • Adjusting air flow resistance
  • Removing coke and carbon deposits
  • Finishing accessory parts

Process Description: How does it work?

There are 3 major elements to the abrasive flow machine process: the tooling, the putty media, and the machine itself.

Tooling: Used to shape, constrict, and direct the flow of the media. This determines what part of the piece will be finished, since the abrasive action occurs at the points where the putty's flow is most restricted.

Media: There are many different kinds of putty that vary based on viscosity, pattern, and abrasive aggressiveness. The putty perfectly conforms to the size and shape of whatever passage it is forced through. The media thus allows for a more consistent polish, since all surfaces are finished simultaneously.

Machine: The machine controls extrusion pressure, flow volume, and flow rate. The hone can operate on a one- or two-way system.

One-way extrude hone systems flow the abrasive media through the workpiece openings in only one direction. This is generally accomplished from a top cylinder powered by a hydraulic ram. This allows the media to exit freely, or extrude, from the part for fast processing, easy cleaning, and simple quick-exchange tooling. This is especially desirable for making dies, since the polishing action occurs in the same direction as material flow, which can greatly extend the life of the die.

Two-way extrude hone systems are more common. This method utilizes two vertically opposed cylinders, top and bottom. These cylinders are powered by hydraulic rams which extrude an abrasive media back and forth through passages formed by the workpiece and the tooling.

Major Abrasive Flow Machine Manufacturers

Bosch Surftran, Dynetics, Extrude Hone, Extrude Hone AFM, Kennametal, Lapmaster Wolters, Surftran, Winbro

Sell Your Abrasive Flow Machine

Liberty is always looking for used extrude hones and abrasive flow machines to buy for inventory. Contact us and let us know what you have for sale. We’ll be happy to give you a free quote.

Check our Inventory for a Used Abrasive Flow Machine

A used Abrasive Flow Machine (AFM) is classified as H5875.

Click below to see our current inventory and request a free quote.

See our used Abrasive Flow Machines (AFMs) for sale.





Dynetics HL

Dynetics HL20

Dynetics HL30

Dynetics HS

Dynetics HS1000

Dynetics HS1000D

Extrude Hone

Extrude Hone 10/6

Extrude Hone 10/

Extrude Hone 150/80

Extrude Hone 4/6

Extrude Hone 6/4

Extrude Hone 6/6

Extrude Hone 77A

Extrude Hone 77B

Extrude Hone 77C

Extrude Hone 8/6

Extrude Hone AFM EasyFlow

Extrude Hone AFM EcoFlow

Extrude Hone AFM One Way Flow

Extrude Hone EasyFlow

Extrude Hone EasyFlow 200

Extrude Hone EcoFlow

Extrude Hone One Way Flow

Extrude Hone Profile

Extrude Hone Profile 100

Extrude Hone Profile 150

Extrude Hone Profile 200

Extrude Hone Spectrum

Extrude Hone Spectrum 10/8

Extrude Hone Spectrum 12/8/8

Extrude Hone Spectrum 16/12/12

Extrude Hone Spectrum 16/8/10

Extrude Hone Spectrum 24

Extrude Hone Spectrum 24/12/12

Extrude Hone Spectrum 8/6

Extrude Hone Vector

Extrude Hone Vector 100

Extrude Hone Vector 100 4/6

Extrude Hone Vector 150

Extrude Hone Vector 150 6/6

Extrude Hone Vector 200

Extrude Hone Vector 200 8/6

Extrude Hone Vector 2000

Extrude Hone Vector 250

Extrude Hone Vector 250 10/6

Lapmaster Wolters

Lapmaster Wolters FFH/AFM

Lapmaster Wolters FFH/AFM 10”

Lapmaster Wolters FFH/AFM 3.25”

Lapmaster Wolters FFH/AFM 6”

Lapmaster Wolters FFH/AFM 8”


Winbro Preci-Flow

Winbro Preci-Flow 1410

Winbro Preci-Flow 2035

Winbro Preci-Flow 460

Winbro Preci-Flow 750


  1. Extrude Hone. Extrude Hone Corporation, Irwin, PA (n.d.). Extrude Hone website.
  2. Extrude Hone: Automatic Die and Mold Polishing. Extrude Hone Corporation, Irwin, PA (n.d.).
  3. GetHoned.com pamphlet. Extrude Hone Corporation, Irwin, PA (n.d.). Website. Extrude Hone.