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hex flat jam nut
standard : JIS , DIN . AISI, GB .
material : carbon steel , stainless steel , alloy steel .brass , copper
class: class4 . class 8, class10.9,class12.9. grade2,grade5,grade8,
finish:plain , black oxide , blue zinc ,yellow zinc , black zinc , nickel and so on.
hex flat jam nut brass / copper