What does 59H mean, and what does 9H mean?

59h is the model parameter of the motor vehicle tire, 59h is the load index and speed level of the tire, 59 means that the tire load capacity is 243kg, and h represents the maximum driving speed of 210km h.

Analysis:

How much speed does the tire H represent (the speed grade of the tire) On the side of common car tires, there are usually many numbers and letters, and in these marking tire specifications, there are some such letters, which are usually marked with“h”、“s”、“t”At the end of a long list of parameters on the side of the tire, they can affect driving safety, but they receive little attention – they are speed symbols.

59h means: 59 hours.

H generally stands for hour, which is an abbreviation for English hour.

As we usually know, the year, day, day, hour, minute, and second are represented by the following letters. Year: a day: d hour: h minute: min second: s.

Here I want to say that generally when we write **, ** often uses a to represent the year, m to represent the month, and d to represent the day. A means each year, while y means year.

The hour is represented by the letter "h", which is an abbreviation of the word hour.

An hour is a unit of measurement of time, and in current usage, an hour is generally equal to 3600 seconds, or 60 minutes, or 1 24 days, except for leap seconds.

The measurement of time in human daily life is generally carried out in hours, for example, the time of day, such as 8 o'clock in the morning is the eighth hour of the day.

9h"Usually indicates the hardness rating of a coating or covering. This grade represents the hardness level of the coating and is often used to describe the scratch resistance of the coating.

Hardness ratings are evaluated according to the Mohshardness standard, which is a quantitative measure of the hardness of a substance. The Mohs hardness scale is classified on a scale of 1 to 10, with 10 being the hardest. Therefore, when 9h is mentioned, it means that the coating has a high hardness, is very scratch resistant, and can effectively protect the coated object.

Especially in the field of screen protection for mobile phones and other electronic devices, 9H glass is a common screen protector. This screen protector is composed of multiple layers of material, in which the coating reaches a hardness of 9h, which can effectively protect the screen from scratches and bumps.

It is important to note that although 9h hardness has high scratch resistance, it does not mean that it is completely scratch resistant or indestructible. Some harder substances, such as diamonds, still have the potential to cause damage to them. Therefore, although 9h provides a certain degree of protection from the cave, it still needs to be carefully used and maintained.

59A brass has a higher lead Pb content than 59H brass.

Copper is a metal chemical element, but also a trace element necessary for the human body, copper is also one of the earliest metals discovered by human beings, is a metal widely used by human beings, belongs to heavy metals.

Copper is the earliest metal used by humans. As early as prehistoric times, people began to mine open-pit copper mines, and used the obtained copper to make **, utensils and other utensils, and the use of copper had a profound impact on the progress of early human civilization. Copper is a metal found in the earth's crust and oceans.

The amount of copper in the earth's crust is about, and in individual copper deposits, the copper content can reach 3% to 5%. Most of the copper in nature exists as a compound, that is, copper mineral. Copper minerals are polymerized with other minerals to form copper ore, and the mined copper ore is beneficiated to become a copper concentrate with higher copper grades.

It is the only metal that can be produced naturally in large quantities and is also found in various ores (e.g. chalcopyrite, chalcopyrite, bornite, chalcopyrite and malachite) and can be used in industry, engineering and processes in the form of elemental metals and brass, bronze and other alloys.

59A brass has a higher lead Pb content than 59H brass.

1. The rim is the part of the wheel that is fixed and installed in the tire, and the hub is the rotating component that connects the wheel and the axle and is responsible for the load between the tire and the axle. 2. The spokes are the parts that support the rim and the hub, and if it is made of aluminum alloy, it is called the aluminum rim and the hub. It is responsible for carrying vehicle weight, transmitting power, tire heat dissipation and other functions, and as a rotating moving part, the wheel hub must meet the conditions of light weight, fatigue resistance, and dynamic balance under the premise of a certain degree of fierce lack of stiffness.

3. The cross-sectional width of the tire refers to the piece where the tire is connected to the ground, that is, the cross-sectional width of the tire where there is a pattern. 4. PR is on behalf of the tire level, specifically refers to the tire strength unit, the more layers, the thicker the more branches.