Specification and size table of O-ring and its introduction
Although the O-ring is small in size and easy to be ignored, its important role in many places can not be ignored. After all, to a certain extent, it helps to ensure the effect of the later stage and the user's actual operation experience. For consumers, it is also necessary to master the information about the O-ring, so as to facilitate the later operation and learning. So the knowledge introduced today not only has its standard, but also the information about the content of the basic plate, which is convenient for selective reading of different needs.
1、 Is the standard of O-ring based on inner diameter and outer diameter?
Standard Specification of O-ring:
According to the old national standard, outer diameter D × wire diameter D2
New national standard (adopting ISO standard): inner diameter × section diameter
International standard (ISO): inner diameter × section diameter
Outer diameter D × wire diameter D2
Example: O-ring 20 * 2.4, Ⅱ - 2, gb1235-76
20 represents the outer diameter of the large ring is 20 mm, 2.4 represents the cross-sectional diameter of the rubber ring is 2.4 mm, II - 2 represents the type of rubber used, and gb1235-76 represents the standard number.
Inner diameter × section diameter
Example: O-ring 7.5 × 1.8-g-n, GB / t3452.1-2005
7.5 represents the inner diameter of O-ring is 7.5mm, 1.8 represents the cross-sectional diameter of O-ring is 1.8mm, and GB / t3452.1-2005 represents the standard number.
G - Series
N -- grade
2、 Introduction of O-ring
O-rings is a kind of rubber sealing ring with circular cross-section. Because of its cross-section is O-type, it is also called O-ring. It began to appear in the mid-19th century, when it was used as a sealing element for steam engine cylinders.
Because of its low price, simple manufacturing, reliable function and simple installation requirements, O-ring is the most common mechanical design for sealing. The O-ring is subjected to tens of megapascal (kilo pounds) of pressure. O-rings can be used in static applications as well as in dynamic applications where there is relative movement between components, such as the shaft of a rotary pump and the piston of a hydraulic cylinder.
The specifications and models of O-ring mainly include uhso ring specification, uhpo ring specification, uno ring specification, DHO ring specification, piston rod O-ring specification, high temperature O-ring, high-pressure O-ring, corrosion-resistant O-ring and wear-resistant O-ring.
The main standards of O-ring are GB 1235-76, GB 3452.1-92; Japanese standard P type, G type, s type, SS / V type, F type; American Standard as568, British standard series; European standard series
The technical requirements of O-ring include appearance requirement, dimension requirement and material physical property requirement.
The appearance shall meet the requirements of GB / t3452.2-2007
The material requirements are in accordance with Hg / t2579-2008
The dimension meets the requirements of t3452.2005
The above introduction of O-ring involves two parts of information: its standard specifications and comprehensive basic knowledge. For those who are interested in learning this aspect and strengthening their understanding, we can learn more practical knowledge about O-ring. For example, there are many classifications under it, and the reference standard details will also affect the actual situation of users The operation effect, and the differences in appearance, material and size also have some subtle effects on this. These contents are worth learning