if plumber block no SNA 512
Bearing no- 22212
sleeve no -H312
Bore Dia-12*5=60
Bearing no always start with 222(last two digit block last two no)
sleeve no always start with -H3 (last two digit block last two no)
Bore Dia-((last two digit block last two no*5)
with same formula all SNA512,SNA 515,SNA517 also described.
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