... :With fitting circle 0:No teeth,1:Normal,outer gear 2:Special type 2:Bigger module, outer gear(6)--Code of installation hole ... ball, mm HSW:Outer gear, single-row ball(4)--Classification code No. of gear module HSN:Inner gear, single-row ball A ... (5)--Dia.of roller ball, mm (3)--Code of installation hole type(6)--Classification code No.of gear module A:Both rings with installation ...