Definition: It usually refers to bearings with an outer diameter of less than 9mm in the metric series or less than 9.525mm in the imperial series.
Materials: mainly including carbon steel, bearing steel, stainless steel, ceramics, and engineering plastics.
Structural features: Adopting a single row deep groove raceway structure, it has good rotational accuracy and high-speed performance, and can withstand radial loads as well as certain axial loads.
Model classification: including metric 68 series, 69 series, 60 series, as well as various models such as imperial R series. In addition, there are products with special designs such as ZZ steel plate dust covers and RS rubber seals.
Application areas: Widely used in office equipment, micro motors, instruments, laser engraving, small clocks, computer cooling fans and other occasions with high requirements for speed and noise.
- Common parameters
Size parameters: The minimum inner diameter can reach 0.6mm. Taking the 68 series as an example, the inner diameter of 683 bearing is 3mm, the outer diameter is 7mm, and the width is 2mm; the inner diameter of 685 bearing is 5mm, the outer diameter is 9mm, and the width is 2.5mm.
Performance parameters: The performance parameters of different models of micro deep groove ball bearings vary. Generally speaking, its maximum speed is relatively high, reaching tens of thousands of revolutions per minute. For example, SKF's 6001 bearing has a basic rated dynamic load of 5.4kN, a basic rated static load of 2.36kN, a reference speed of 60000r/min, and a limit speed of 38000r/min.
Tolerance grade: Usually following ISO tolerance standards, precision grades include ordinary grade (P0), P6, P5, etc. High precision grade bearings are suitable for occasions with high requirements for rotational accuracy.
