1. Product Overview The 6814ZZCM NS7S5 is ultra-thin wall single row deep groove ball bearing with double ZZ metal dust shields, CM motor controlled clearance and pre-filled NS7 low-temperature long-life grease, standard dimension 70×90×10mm. CM special clearance eliminates motor resonant vibration; double non-contact steel shields block fine dust without sacrificing high rotation speed. NS7 lubricant works stably from -40℃ to 130℃, maintains low friction and quiet running,