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Your location: Home > Related Articles > FAG bearing HC7004-C-T-P4S-UL difference

FAG bearing HC7004-C-T-P4S-UL difference

Author:QINSUN Released in:2023-04 Click:153

The difference between FAG bearing HC7004-C-T-P4S-UL

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Bearings are one of the important parts of machinery, its main function is to convert rotary motion into linear motion. The precision grades of bearings are generally divided into 5 grades:

Ordinary kwquality, standard quality, high precision (special) and ultra high precision (uhc). Among them, there are three levels of precision in the ordinary level, namely p3, p4 and p6. The default precision level is two levels, e2, e3 respectively. In practical applications, bearings above class 5 are used less. The following is a brief introduction to the differences between imported and domestic bearings:

1. Differences in appearance

1. From the size perspective, the outer diameter of imported bearings is larger; the inner diameter of domestic bearings Slightly larger.

2. On the outside, imported products often have plating or embossed webs, while domestic products do not have these processes.

3. From the color point of view, the color of domestic products is yellowish, the color of imported products is white.

Second, the difference in quality

1. The material is generally made of iron-chromem alloy steel in China, which has higher hardness but poor toughness; it is made of high quality foreign speed steel, which has lower hardness but good toughness.

2. Heat treatment In China, the quenching and tempering treatment of normalizing and tempering is often used; the heat treatment process abroad is generally quenching and tempering, quenching and tempering, and carburizing and quenching heat treatment.

Third, the difference in performance

1. The materials of the rolling elements are different, and domestically made mostly high-quality carbon structural steel or alloy structural steel is turned by hot rolling and forming; Most imports are powder metallurgy products.

2. The materials of cages are different. In general, domestic steel stamping cages are used, while foreign products use copper-based alloys.

3. Various materials for sealing rings Most of the domestic products use polytetrafluoroethylene as the sealing ring material, most of the foreign products use nitrile rubber as the sealing ring material.

4. Different installation methods

1. The diameter of the inner hole is different. Due to the backward production equipment in China, the inner hole diameter cannot be standardized, so the same type of cylindrical rollers The inner hole diameter is also inconsistent.

2. The axial clearance is not the same. Due to technical reasons, domestically produced cylindrical rollers can change the consistency of the axial clearance.

3 .Different types of greaseThe lubricating grease of domestically produced cone rollers and spherical rollers is generally calcium-based grease and grease based on barium.

4. There are different types of anti-rust oil.

5. There is also a big differencel in the way of assembling.

6. The packaging is also different. 5. The price difference Under the same conditions, domestic products are much cheaper than imported products 6. Comparison of the life expectancy of two kinds of products with the same specification: ordinary type and high-precision type The life of ordinary type and low-precision type is more than 10 times different. The service life of high-precision and ordinary types is also about 10 times different.