Stainless Steel Pins for Magnetic Polishing

Stainless steel pins are the non-abrasive media that makes magnetic polishing work. Driven by a rotating magnetic field, the needle-shaped pins reach into threads, cross-holes, slots and micro-cavities to remove burrs and heat tint without changing part dimensions.

We supply pins in diameters from 0.3 mm to 2 mm and in lengths matched to your machine and part geometry, made from corrosion-resistant stainless steel that keeps its shape and magnetic response through thousands of cycles.

Pin selection depends on the feature to be finished: smaller diameters for fine threads and micro holes, longer pins for deep bores. Tell us your part material and features and we will recommend the pin size and mixing ratio.

Frequently Asked Questions

What are stainless steel pins used for?

Stainless steel pins are the working medium in magnetic polishing and pin finishing machines. Driven by a rotating magnetic field, the pins grind and burnish the surface of the workpiece, reaching internal holes, slits, threads and recesses that conventional tumbling media cannot enter.

Can steel pins polish blind holes and internal threads?

Yes. Because the pins are thin and flexible, they are drawn through small openings and follow the internal geometry of the part. This is the main reason magnetic pin finishing is used on hydraulic, fuel-system and connector parts where internal surfaces must be burr-free and smooth.

Do steel pins wear out and need replacing?

Steel pins do wear progressively as they work. They are monitored by size, brightness and process performance, and are replaced when the cut rate drops or the finish degrades. Keeping the pin charge topped up with the correct size range is the key to stable results.