The normal size of the wire diameter (cross-sectional diameter) of an O-ring depends on its nominal size, application and specific requirements. O-rings are usually divided into different nominal size series according to their size, such as A, B, C series, etc., and each series has a certain range of nominal sizes.
Here are some examples of common o-ring nominal sizes that typically follow international standards (e.g., ISO 3601):
Series A:
From 074 mm to 662Within the range of 1 mm, each series has a range of nominal sizes.
Series B:
From 178 mm to 566Within the range of 1 mm, each series has a range of nominal sizes.
C Series:
From 24 mm to 510In the range of 5 mm, each series is available in a range of nominal sizes.
These dimensions are examples only and the exact size range may vary by manufacturer, standard, or application.
For specific applications, the normal O-ring gauge should be determined based on the equipment design and operational requirements. When choosing an O-ring, there are the following factors to consider:
Working Environment:Including operating temperature, pressure, and other conditions.
Size fit:The size of the fit between the O-ring and the sealing groove.
Material & Hardness:O-ring material and hardness selection related to media, operating conditions, etc.
In practice, it is advisable to consult the relevant standards, the documentation provided by the manufacturer, or consult a professional engineer to ensure that the O-ring selected meets the requirements of the equipment. The wire size of the O-ring should be able to meet the requirements for sealing performance and durability under normal operating conditions.