Full explanation
Base logic: first digit of GOST number = series (2 light, 3 medium, 4 heavy); then inner diameter in mm (for numbers 04-99 multiply by 5: 208 → 40 mm, 312 → 60 mm). Most-popular mappings: GOST 208 (radial ball 40×80×18) = ISO 6208 / DIN 625, price UAH 180–320 [VERIFY]; GOST 7524 (tapered roller 60×130×33.5) = ISO 32224 / DIN 720, price UAH 1 400–2 600 — used in the MTZ-82 rear axle; GOST 27-26 (self-aligning) = UC205/208 UCP housing. Batch 3 parts-tires-kb correction: GOST 7524 was listed as 30313 in Batch 1 — that's wrong, correct is ISO 32224 (NN 32224 in European naming). Manufacturers: HRB (China, locally 40% cheaper than SKF), NSK, FAG, SKF, NTN. Counterfeits: fake SKF in «MTZ repair kits» at UAH 400–800 against real UAH 1 800+ — open the packaging, check engraving on the inner ring (real SKF is matt-even, fake is glossy and uneven). Source: parts-tires-kb.ts `gost_iso_crossref` table §Batch 3 correction.