Bearing axis of rotation of the various mechanical or moving parts of the bearing parts are widely used in farm vehicles, tractors, diesel engines, electric motors, threshers and other agricultural machinery. Purchase bearings commonly used bearing code bearing code more complicated, agricultural hand to grasp the law of identification bearing code, purchase easy.

Commonly used bearings are some of the standard model, code-named "0" tolerance level is the "G" (general level), can not write the first paragraph of the general bearing, so the code more than the 7-digit basic code. To illustrate the meaning of the bearing code: cases 7002136 (135 series diesel engine shaft main bearings), the basic code from right to left to identify. "36" two-digit light is calculated as 36 × 5 = 180 mm; "1" indicates the diameter of series of special light; "2" indicates the type of cylindrical roller bearings;"00" indicates that the outer ring of the bearing structure without ribs; "7" width series for narrow. If the machine hand to buy the 7-digit standard model bearing code and so on.

Purchase bearing the reference bearing diameter and bearing bore diameter in the basic code with the right end of the first, the second decimal place. The bearing diameter sub-standard and non-standard diameter, the difference between non-standard diameters not an integer or 5 are integer multiples. To facilitate the machine hand to buy now illustrate:
① bearing diameter 9 mm below the actual size of the right end of the first digit. Such as the bearing number 18, its inner diameter of 8 mm.
The ② bearing diameter 10-17 mm with a set number of said. Such as bearings100, 201,302,403, its inner code the right end of the double-digit 00,01,02,03, the diameter 10,12,15,17 mm fixed numbers indicate. ③ bearing bore diameter 20-480 mm(22,28,32 excluded) to the diameter size in addition to the five income number.
④ bearing inner diameter of 500 mm or more (22,28,32), expressed as a fraction, the denominator indicates the internal diameter, the molecular series of bearing size, type and structure. For example, 30031/560 bearings, the inner diameter of 560 mm, and so on.