FF-3525 Flat Needle Roller Bearing 3.5×25×75mm for Machine Tool Linear Slide Product Overview FF-3525 is ringless flat linear needle roller cage assembly for heavy-duty low-friction linear motion. Equipped with GCr15 steel rollers and nylon cage, this flat needle unit delivers high load capacity and stable rolling performance for reciprocating sliding in heavy machinery. *Need a quick quote? Just send us your bearing model & quantity — we’ll get back to you fast. Key