This 17 x 30 x 7 mm (6903-ZZ) bearing is a metric deep groove ball bearing. The 6903-ZZ inner diameter is 17 mm, the 6903-ZZ outer diameter is 30 mm, the 6903-ZZ width is 7 mm.
This bearing has non-contact metal shields on both sides to protect the bearing from dust or any possible contamination, which can extend bearing life, and retain the lubricant in the bearing.
NZ $4.20 each
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