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AS568 A O-ring standard specifications

发布时间:2019-08-01 13:59来源:上海赫希密封材料有限公司官网 点击:

About the AS 568 A standard for O-rings

The AS 568 A standard for O-rings is produced by the Society of Automotive Engineers AS (Aerospace Standard). The AS 568 A specification describes 369 O-rings. Each size is designated with a dash number and can be described using two values: the inside diameter and diameter of the cross-section. Except for the -9## O-rings, all American inch O-rings can be categorized into seven cross-sections and 119 inside diameters.

The nominal size for any given American inch o-ring, however, is different than the actual physical dimension of the o-ring. As an example, consider the -001 o-ring. Nominally, it is described as having a cross-section of 132 inch. The decimal equivalent of 132 inch is 0.03125 inch. However, the actual cross-section is 0.04 inchWhy the discrepancy? The nominal sizing of the American inch system is meant to describe the size of the groove in which the O-ring resides. Since all O-rings must be squeezed by about 10% to 15% in order to seal properly, the extra size of the O-ring handles the needed squeeze.

文章出自上海赫希密封:http://www.heximf.com/jszc/20190801196.html
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