Iron Shielded Deep Groove Ball Bearing is one type of ball bearings. shields are non-contact metallic (carbon or stainless steel) devices which allow high-speed operation but offer limited protection against the ingress of moisture and dirt. but do not protect against liquids. They add no friction during operation and therefore do not generate heat build-up. Iron shielded deep groove ball bearings often have steel shields installed on one or both sides and are pre-lubricated with grease. While many different retainers are available, pressed steel cages are most commonly used.
Bearing dust shields have been available almost as long as Ball Bearing itself. Shields are needed to stop the grease lubrication used in these bearings from leaking out. This is particularly important in applications where grease leakage may contaminate the product. The main impetus towards shielded bearings comes from the growing use of [sealed-for-life" bearings in items such as white goods, cars and power tools. Shields are fitted in the outer ring and do not make contact with the inner ring, but form a narrow gap with it.
Depending on the bearing design, series and size, MANU supplies shields in different designs.
With one shield (-Z) on one side or two shields (-2Z/ZZ) on both sides; Due to the manufacturing processes used, open bearings can have turned recesses in the outer ring for shields.
Celarance:
Internal clearance provides the bearing room for expansion between the bearing races and will add a small amount of play between the two rings. Large clearance C3/C4 usually used in harsh environment. with good anti-seize performance used in particularly harsh environment.
Tolerances
The standard version of our single-row deep groove ball bearings has the tolerance class P0
(designs with tighter tolerances available upon request)
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Li Jiange, deputy director of the Development Research Center of the State Council, once gave a real and "exaggerated" example. A few years ago, A province had to go to a hydroelectric power plant and wanted to sell electricity to C area, but in the middle it needed to be transmitted through the power grid of B province. At that time, B province introduced a group of small generator sets and built a batch of smaller ones. power plant. B provinces are concerned that if A province's electricity is allowed to transmit through the province's power grid, it is difficult to guarantee that A province's electricity will be sold in the province. This will inevitably impact the province's electricity market. If the electricity price in province B is reduced, the newly built small power plant will be closed down. The loan to buy a generator will become a bad loan. So, the responsible person in Province B said something very famous: "If you want to sell electricity to Area C, use a plane to transport it."
In fact, this is a true reflection of the mood of local governments at all levels in promoting local economic development. The enterprise is the main body of economic development and the pillar of national competitiveness. In the case of government-led rather than market-led allocation of resources, the government's functions can only be "misplaced" and "offside." This kind of "enterprise economy" formed by government and enterprises, makes the government-led investment enterprises lack the desire for competition and their own ability to decline; and enterprises that want to "grow up" will not be scaled up and will not produce benefits.
China is a big country. We want to give full play to the advantages of big countries. That is the big market. If we cannot successfully implement the reform of the existing government management system and not allow the factors that affect productivity to flow, then for our company, it will never grow.
In this way, non-competitive enterprises not only continue to occupy valuable resources, but also continue to distort market prices and create vicious competition. Such a situation will hinder the formation of large enterprises and will hinder the formation of independent innovation capacity enterprises. It is difficult for an enterprise to form an effective profit in front of a segmented market because it has to pay an extra low cost.
The "Proposal" reviewed and passed at the Fifth Plenary Session of the 16th CPC Central Committee clearly stated that in order to separate government from enterprises, various institutional reforms must be carried out. Not only that, the national "Eleventh Five-Year" regional plan that favors the formation of the big market has also been placed in an important position. We believe that in the next five years, decentralized market players will establish an overall sense of identity in a fair and harmonious society. The automobile industry that needs scale development will also have new integration. However, this integration requires a market. Under the leadership of natural integration. 
