Upper： 1-1/8"" / Steel cup / Z-type bearing Bottom： 1-1/8"" / Steel cup / Z-type bearing 15mm Alloy Top Cover Stack Height 17.7+4=21.7mm
CHEX-1189B-NY
w/8mm Nylon Top Cover, S.H.=14.2mm
CHEX-1189A-NY
w/15mm Nylon Top Cover, S.H.=21.7mm
CHEX-1189B
w/8mm Alloy Top Cover, S.H.=14.2mm
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