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The ring
and balls of NCTX bearings are made of refining bearing
steel GCr15(AISI 52100),the retainer are punched from
brass strip(H62) or top quality cold-rolled steel strip(SPCC
BQB402) and reinforced plastics are avail-able if necessary.The
shield is made phosphatizing steel skeleton are hot pressed.
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The radial
play of bearings is specified as five groups as follows
in accordance with Chinese national standard GB4604……
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The vibration
and noise of bearings are classifited as Z1,Z2 and Z3.It
is measured by the instrument of SO910-1.
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The bearing
tolerance is classified as Class2,4,5,6and 0 accordance
with the Chinese national standard GB/T307-94.The table
as below makes a comparison between this classification
of tolerance with Chinese national standard GB307-84 as
well as ISO standard.
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The bearings
are divided into various types such as bearings,single
shield or double shield(z,zz) and single seal or double
seals(RS,2RS).They are filled with proper quantity antirust
lubricant or grease before shipment.All shese bearings
can be used after unpacking without cleaningp.
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