What are the dimensions of a 606 bearing?

How it is worked out

1. Type6 → deep-groove ball bearing
2. Series0 → series 60 · extra-light · dimension series 10
3. Bore code6 → 6 mm (miniature: the last digit is the bore)

d = bore code × 5 mm (04+) · 00 = 10 · 01 = 12 · 02 = 15 · 03 = 17 mm

Worth knowing

In inches

0.236 × 0.669 × 0.236 in. A metric bearing: inch-series bearings (R8, 1600…) do not fit the same shaft.

2RS · 2RS1 · 2RSH · DDU · LLU

Rubber seal on both sides, greased for life. Best against dirt and water, slightly more drag. The same bearing by brand: SKF 606-2RSH or -2RS1, FAG 606-2RSR, NSK 606DDU, NTN 606LLU.

ZZ · 2Z · 2ZR

Metal shield on both sides. Less friction and more speed than a seal, but not watertight. SKF 606-2Z, FAG 606-2ZR, NSK and NTN 606ZZ.

RS · Z

Seal (RS) or shield (Z) on one side only, the other side open: for bearings fed oil or grease by the machine.

C3

Internal clearance larger than normal. Standard on electric motors and wherever the shaft runs hot or the fit is tight. Replace a C3 with a C3.

Interchangeable?

Yes. ISO 15 fixes the bore, outside diameter and width, so a 606 from any maker fits the same shaft and housing. Seals, cage, clearance and quality are what differ.

Other bores in the 60 series

Same 6 mm bore, other series

Do it with your own numbers

Got a number off a bearing with suffixes on it? Paste it into the bearing number decoder: it reads the whole designation, seals and clearance included.

Keep it on the wall

This answer is one row of the printable bearing size chart — one A4 or Letter page, free, no sign-up.