GB/T 6070-2025 Vacuum technology—Dimensions of non-knife edge flanges

Scope

This document specifies the dimensions of non-blade flanges commonly used in vacuum technology.
These dimensions ensure the interchangeability between fixed flanges, swing flanges, and clamp flanges:
a) Whether it's the assembly of flanges of the same type (such as fixed flanges or clamp flanges) or the assembly of flanges of different types (such as fixed flanges and clamp flanges assembled with bolts or clamps, and fixed flanges and swing flanges assembled with bolts);
b) Regardless of whether the sealing rings used with the flanges are elastomeric "O"-ring sealing rings or metal sealing rings, as long as they are compatible with the linear sealing loads of the flanges specified in Appendix C.

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