I. Bearing Model-Basic Model
–The first number or the first letter or letter combination indicates the bearing type.
–The last two digits determine the ISO size series; The first number represents the width or height series (dimension B, T or H respectively), and the second number represents the diameter series (dimension D).
–The last two digits of the basic model are the size code of the bearing; Multiply by 5 to get the inner diameter in millimeters. But there are some exceptions to any rule. The most important exceptions in the bearing model system are listed below.
1. In some cases, the number indicating the bearing type and/or the first number indicating the size series is omitted. These figures are in brackets in the table.
2. For bearings with inner diameter less than or equal to 10 mm or greater than or equal to 500 mm, the inner diameter is usually expressed in millimeters, and there is no code. Dimensions are separated from the rest of the bearing model by diagonal lines, such as 6 18/8 (d = 8mm) or 5 1 1/530 (d = 530mm). According to ISO 15: 1998.
This method is also applicable to standard bearings with diameters of 22, 28 or 32 mm, such as 62/22 (d = 22 mm).
3. Bearings with inner diameters of 10, 12, 15 and 17mm have the following dimension code marks: 00 =10mm01=12mm 02 =/.
4. For some smaller bearings with inner diameter less than 10 mm, such as deep groove, self-aligning and angular contact ball bearings, the inner diameter is also expressed in millimeters (no code), but it is not separated from series models by diagonal lines, such as 629 or 129 (d = 9 mm).
5. The bearing inner diameter that deviates from the standard inner diameter is always expressed in millimeters, with at most three decimal places, and there is no code. The internal diameter mark is a part of the basic model and separated from the basic model by a diagonal line, for example, 6202/15875 (d =15875 mm = 5/8 inches).
Second, the series mode.
Each standard bearing belongs to a specific bearing family, which is determined by a basic model with no dimensional significance. Series models usually include suffixes a, b, c, d or e or a combination of these letters, such as CA. These letters are used to determine differences in internal design, such as contact angle.
The most commonly used series models are shown in the table above the bearing diagram. Numbers in brackets are not included in the series model. SKF Bearing prefix and Its Meaning
GS—— thrust cylindrical roller and thrust needle roller bearing races. Example: GS8 1 107- race of thrust cylindrical roller bearing 8 1 107. K—— In the thrust roller and cage assembly. For example: K8 1 170.
K-—— the inner ring (inner cone) or outer ring (cone ring) of inch tapered roller bearing with roller and cage assembly that conforms to AFBMA standard series. Example: Inner cone of K-09067-09000 series tapered roller bearing.
L—— Separate the single inner ring or outer ring of the bearing. Example: lnu207- Inner ring of cylindrical roller bearing nu 207. Postal code (suffix) of SKF bearing and its meaning
The ACD- contact angle of single row angular contact ball bearing is 25 degrees. B—— Contact angle is 40 degrees. CC—— Contact angle is 12 degrees.
Self-aligning roller bearing
CAC, ECAC, CA, ECA- these are designed for large-size bearings, and the rollers are symmetrical. Both sides of the inner ring are provided with fixed flanges, and the movable retaining ring is guided by the inner ring. The cage is a complete brass or steel solid frame. The roller and raceway surfaces of CAC and ECAC bearings are optimized, which is helpful for roller guidance and can reduce friction. The ECAC model is equipped with reinforced rollers to improve the load capacity.
-2F—— There are dust-throwing retaining rings on both sides of the outer spherical ball bearing. -2FF—— There are combined dust-throwing retaining rings on both sides of the outer spherical ball bearing.
Universal paired single row angular contact ball bearings. When arranged face to face or back to back, there is a certain pre-installation preload in the bearing.
GA—— There is slight preload in the bearing when it is arranged face to face and back to back. GB—— When arranged face to face and back to back, there is a moderate preload in the bearing. GC-When arranged face to face and back to back, there is a great preload in the bearing.
K—— Tapered hole with taper of 1: 12. K30- Tapered hole with a taper of 1: 30. FAG bearer prefix and its meaning r are placed directly before the bearer basic code, and other prefix codes are separated from the basic code by dots. GS- thrust cylindrical roller bearing race. For example: GS.81112k-rolling ... k-conical hole, taper 1: 12. K30- Tapered hole with a taper of 1: 30. FAG carries prefix code and its meaning
R is placed directly in front of the bearing basic code, and other pre-coding points are separated from the basic code.