This 9 x 17 x 5 mm (689-ZZ) bearing is a metric deep groove ball bearing. The 689-ZZ inner diameter is 9 mm, the 689-ZZ outer diameter is 17 mm, the 689-ZZ width is 5 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 $2.80 each
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