Each type of bearing - bearings are printed with different numbers and characters. Depending on the manufacturer and the specific characteristics that the characters (Code) are printed differently, they are based on the general scientific principle that all manufacturers must comply with.
The basic meaning of the parameters printed on bearings - bearings are divided into two categories: Trade meaning and technical meaning
I. MEANING OF TRADE
1. Meaning of brand:
All products in general do not have to bear the brand and origin of the bearings if they want global trade. A product of bearings - bearings has many manufactured manufacturers. The meaning of the brand is clearly distinguishable from the consumer, which product is produced by which manufacturer. The meaning of a brand can be a symbol (brand logo) or the abbreviation of that brand. Examples include INA - FAG, NKS, TIMKEN, KOYO ...
Figure 1: Bearings - FAG bearings fully printed with the brand logo and origin
2. Meaning of origin:
The origin is printed on bearings - bearings help to understand where this product is produced, in which country. Many manufacturers put production technology in countries with low labor costs and low production costs. These products are strictly compliant with the quality of the specified manufacturer. For example, INA bearings can also be made in China, TIMKEN bearings can be manufactured in Pakistan ...
Figure 2: German INA brand bearings are manufactured in the US
3. Meaning of production date
Depending on the manufacturer and the type of bearing, the date of manufacture is printed or not. They are not required to be printed on bearings. For example, bearings are too small, the manufacturer does not print the production date on them but prints on their packaging.
II. TECHNICAL MEANING OF BALL SIGNAL PARAMETERS
Technical meaning helps us choose the product as desired, but not everyone knows. It is possible that the trade specifications are not fully printed but the specifications are required to be printed on bearings - bearings.
1. Meaning of size.
The last two numbers indicate the inner diameter of bearings from 00-99 (20mm < D < 5000mm). Some types of bearings used in super large machines may have an internal diameter (D) of greater than 5000mm. And some bearings used in Micro machines (commonly in medical dentistry) may be smaller than 20mm.
For example: bearings with symbol 2315
We will take the following two-digit value multiplied by 5: We have 15x5 = 75mm. Meaning the inner diameter is D = 75mm (hole diameter)
Bearings are denoted 304
Value 4 x 5 = 20mm. Internal diameter is 20mm
Thus the number of symbols from 04 or more will be multiplied by factor 5. The remaining 04 or less with special symbols are converted as follows: 00: 10mm, 01: 12mm, 02: 15mm, 03: 17mm. This is the basic point that you need to master to choose your product accurately.
Figure 3: Koyo bearings are always printed with full specifications and trade
2. Meaning of bearing level of bearing - bearing.
Notice the third character from right to left, which means the following:
| Symbol number 1 or 7: Very light load Symbol number 2: Light load only Symbol number 3: Only average load Symbol number 4: Heavy load only | Symbol number 5: Very heavy, super heavy loads Symbol No. 6: Only average load like 3 but thicker Symbol number 8-9: Only very light loads; 814, 820, 914 |
3. Meaning of classifying bearings - bearings
The fourth right-to-left symbol is denoted from 1 - 9. They mean the following:
| Symbol No. 0: Only one round ball type Symbol No. 1: Only two round ball types Symbol No. 2: Only 1-layer short ball bearings Symbol number 3: Only two-layer short ball bearings Symbol No. 4: Only 1-layer chopsticks | 5: Only twisted chopsticks 6: Only round ball bearings 7: Only type of tapered roller ball 8: Only round ball bearings are not radial 9: Only type of chopsticks |
4. Meaning of structure:
The 5th character from right to left means the following:
| 3: Short cylindrical chopsticks, 1 block, no inner ring 4: Same as 3 but the ring has a burrow 5: There is 1 tooth to install the positioning brake ring on the outer ring | 6: There is a black dragon blocking oil in steel 8: There are two black dragons blocking the oil in the leaf 9: Short cylindrical chopsticks are 1 row, in the inner ring, there is 1 ring to block the rollers |
For example Read the parameters of bearings with symbol 60304
- Inner ring diameter 04x5 = 20mm
- Under average load
- Ball round a class
- There is a black dragon blocking oil in steel
Attention : For bearings with only the last 3 digits, the last number indicates the inner diameter of the bearing (D < 20mm).
For example: 678, d = 8mm, light load, round ball type
Diagram of bearing structure
- The meaning of the error of the bearing gap
Neck shaft size | New ball bearings | New cylindrical ball | Old bi allowed |
20-30 | 0.01-0.02 | 0.03-0.05 | 0.1 |
30-50 | 0.01-0.02 | 0.05-0.07 | 0.2 |
55-80 | 0.01-0.02 | 0.06-0.08 | 0.2 |
85-120 | 0.02-0.03 | 0.08-0.1 | 0.3 |
130-150 | 0.02-0.03 | 0.10-0.12 | 0.3 |
- The meaning of silver gap error
Neck shaft diameter | Clearance between shaft and silver ring | |||
<1000 v/p | >1000 v/p | |||
Standard | Allow | Standard | Allow | |
18-30 | 0.040-0.093 | 0.1 | 0.06-0.118 | 0.12 |
30-50 | 0.05-0.112 | 0.12 | 0.075-0.142 | 0.15 |
50-80 | 0.065-0.135 | 0.14 | 0.095-0.175 | 0.18 |
80-120 | 0.08-0.16 | 0.16 | 0.12-0.210 | 0.22 |
120-180 | 0.100-0.195 | 0.20 | 0.150-0.250 | 0.30 |
180-260 | 0.120-0.225 | 0.24 | 0.180-0.295 | 0.40 |
260-360 | 0.140-0.250 | 0.26 | 0.210-0.340 | 0.5 |
360-500 | 0.170-0.305 | 0.32 | 0.250-0.400 | 0.6 |
