Bearing designation decoder

Type any bearing designation and get every character explained — bore, outside diameter, width, bore type, seals or shields, clearance class — plus the equivalents other manufacturers publish for it. The answer is computed from ISO 15 structure and published interchange tables, not guessed.

Try:22226 K · 6205-2RS · 2205-K-2RS · 6010ZZ · NU2210 ECP · 1635 2RS

How a metric bearing designation is built

Most metric bearings follow ISO 15. The designation splits into a type and series prefix, a two-digit bore code, and a string of suffixes describing how the bearing is built. Read 22226 K as: spherical roller bearing (22), diameter series 2, bore code 26, tapered bore (K).

Bore code

The last two digits before the suffixes give the bore. From 04 upwards, multiply by 5 — bore code 26 is a 130 mm bore, code 08 is 40 mm. Below that the codes are fixed: 00 = 10 mm, 01 = 12 mm, 02 = 15 mm, 03 = 17 mm.

Common suffixes

2RS / 2RSR / DDU: Contact rubber seals on both sides. One seal only: RS.
ZZ / 2Z: Metal shields both sides — lower friction than seals, less protection.
K: Tapered bore, normally 1:12, mounted on an adapter sleeve. Not interchangeable with a straight bore.
C2 / (none) / C3 / C4: Radial internal clearance: tighter than normal, normal, looser, loosest. C3 is the usual choice where the bearing runs hot or sits on an interference fit.
W33: Lubrication groove and three holes in the outer ring.
E / EC: Reinforced internal design — more or larger rolling elements, higher load rating.
P6 / P5 / P4 / ABEC-…: Precision class. Lower number is tighter; ISO P0 (unmarked) is standard.

What this tool will not do

Inch-series tapered roller designations (the Timken-style HM926747/HM926710 family) are catalogue numbers, not structured codes — there is nothing in the characters to decode, so the tool reports them as unrecognised rather than inventing a reading. Cross-references are what the manufacturers publish for their own sales teams; they mix true equivalents with OEM part numbers, so always confirm dimensions and fit before ordering.