deep groove ball bearing 688

The 6 of 688 bearings represent deep groove ball bearings, the middle 8 represents the size series, and the outermost 8 represents the inner diameter size of 8 mm.

688 bearing and closed and open type difference, open type is bearing on both sides without cover, directly expressed by 688; The closed type is equipped with a cover on both sides. The cover has two kinds: dustproof cover (indicated by 688ZZ) and rubber seal cover (indicated by 688-2RS).

688ZZ bearing with dustproof cover has a dustproof function, high-temperature resistance ability is strong; The rubber seal cover 688-2RS has a dustproof and waterproof function because it is sealed form, poor heat dissipation ability, not suitable for use in a high-temperature environment, but under the same conditions, the noise is lower than that with dustproof cover.

The old model of 688 is 618/8, and the size specification of the national standard bearing is: inner diameter * outer diameter * thickness =8mm*16mm*5mm. The non-standard bearing is determined by the actual size, but it is not far from the size specification of the national standard, so the actual use is less and the cost is higher. The main material is carbon steel, bearing steel (GCr15), stainless steel (440 or 304), ceramic ball, plastic, etc., cage material is carbon steel, J steel plate stamping, nylon cage, and so on! Mainly used for force and deformation detectors, waste incinerators, multi-functional separation hydraulic tools, vulcanizing machines, ventilators, solenoid valves, non-metallic material testing machines, magnetic devices, precision reducers, massage belts, electric toys, electronic accessories, instrumentation, sports equipment, pulley, and other equipment

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