Bearing ID Gauge | Identify Any Bearing in 3 Seconds

You pulled a dead bearing out of a scooter, a printer, a fan or a skateboard. Now what is it?

Drop it on this plate. Each station is a pin inside a pocket: if the bearing sits over the pin and inside the pocket at the same time, the label next to it is your bearing. No caliper, no guessing, no chart.

What it identifies

Ten of the most common bearings, each with its own labelled station:

625 · 608 · 6000 · 6001 · 6002 · 6003 · 6200 · 6201 · 6202 · 6203

Plus a shaft comb along the top edge: seven slots that identify rod diameters of 3, 4, 5, 6, 8, 10 and 12 mm. Slide the rod in, read the number.

bearing

How it works

Every station checks two dimensions at once. The centre pin verifies the bore, the pocket verifies the outside diameter. A bearing only fits flush where both match, so a fit is an identification, not a guess. Pin and pocket clearances are tuned for printed accuracy: 0.20 mm on the pin, 0.50 mm on the pocket.

And once you know the size

Every one of these ten bearings exists as a print in place model on my profile, together with 27 thrust bearings and 12 LM linear bushings, all with the same verified clearance philosophy. Identify it here, print it there.

Print settings

• Flat on the plate, no supports anywhere
• 0.20 mm layer height, 3 walls, 15 percent infill
• Multicolor labels: the text is raised 0.6 mm, so a filament swap at that height gives clean two colour lettering even without a multicolor setup.