The Term of RFS The Regardless of Feature Size(RFS)is when a geometric tolerance (or datum) applies independent of the feature size. That is,the geometric tolerance is limited to the stated amount regardless of the size of the feature-of-size. Shanghai Jiao Tong University 6Shanghai Jiao Tong University 6 The Term of RFS n The Regardless of Feature Size (RFS) is when a geometric tolerance (or datum) applies independent of the feature size. That is, the geometric tolerance is limited to the stated amount regardless of the size of the feature-of-size