Imported bearing basic code

1 basic code is used to indicate the bearing inner diameter, diameter, width and types, generally for a maximum of five digits, first points above are as follows: 1) Bearing inside diameter using basic code right first, H a digital representation. The common d = 20 ~ 480 mm inner diameter bearing diameter is commonly in multiples of 5, the two figures show that the bearing inner diameter size is 5 except the quotient, such as 4 d = 20 mm; D = 12 said 60 mm, and so on. For the inner diameter of 10 mm, 12 mm, 15 mm and 17 mm bearing, inner code followed by 00, 01, 02, 03. For bearing diameter less than 10 mm and greater than 500 mm, inner diameter otherwise stated in the said method, can see the GB/T272 - 93. 2) The diameter of the bearing series ( The structure of the same diameter and bearing series of changes in outer diameter and width) Using basic code right up the third digital representation. For example, for the centripetal bearing and angular contact bearings, 0, 1, said extra light series; 2 said light series; 3 said in series; 4 said heavy series. Between the various series of size for such as shown below. Thrust bearing, except in 1 extra light series is consistent with the rest of the centripetal bearing said. 3) The width of the bearing series ( Have the same structure, inner diameter and diameter series bearing width changes in the series) Using basic code right up the fourth digit said. When the width of the figure 13-4 diameter series contrast as zero series ( Normal series) When, for most bearing in the code doesn't mark the width in the series code O, but for spherical roller bearings and tapered roller bearings, the width of the series code 0 should be marked. Diameter series code and width size code referred to as series code. 4) Bearing type code using basic code right up the fifth number ( For cylindrical roller bearings and needle roller bearing type code for letters) 。 2 codes of the rear bearing rear codes is expressed in letters and Numbers such as bearing structure, the special requirements of tolerance and material and so on. The content of the post code a lot, here are a few commonly used code. 1) Internal structure code is for the same type bearing different internal structure, followed by the basic code said with letters. Such as: contact Angle is 15 °, 25 °, 40 ° and angular contact ball bearing with B and C, AC said the internal structure of the different. 2) Bearing tolerance grade levels are divided into 2, 4, 5, 6, 6 x and level 0, a total of 6 levels, in turn, from senior to junior, the code/PZ respectively, / P4 / PS/P6, / P6X and/PO. Tolerance grade, grade 6 x applies only to taper roller bearing; Level 0 for regular grade, not marked in the wheel bearing code. 。 3) Commonly used bearing radial clearance series is divided into 1 group, 2, 0, 3, 4 and 5 groups, a total of six categories, radial clearance, in turn, from small to large. O clearance is a common set of clearance, not marked in the bearing code, the rest of the clearance group respectively in bearing code/CI, CZ /, / C3, C4 and/CS said. 3 front code bearing of the front code used to represent the division of bearing parts, with the letters. If use L said separable bearing separable ring; K said bearing roller and cage components and so on. The actual application of the rolling bearing type is many, the corresponding bearing code is also more complex. The code above is the most basic, the most commonly used in bearing code section, familiar with that part of the code, you can identify and choose the used bearing. Example: 30210 / P6X3 is a front bearing code ( Cone stone roller bearing) 02 series code 10 inner code refers to the size ( Nominal diameter of 10 times five equals 50 mm) Rear p6X code, said conforms to the standard stipulated by the grade 6 x.