表面不均匀性 meaning in Chinese

surface heterogeneity
surface inhomogeneity
surface irregularity

Surface discontinuities on general application bolts , screws , and studs
普通螺栓螺钉和双头螺栓的表面不均匀性
Standard specification for surface discontinuities of nuts , inch and metric series
英制和米制系列螺母的表面不均匀性用标准规范
Fasteners - surface discontinuities - bolts , screws and studs for general requirements
紧固件的表面不均匀性.第1部分:一般要求的螺栓螺钉和螺柱
Standard specification for surface discontinuities of bolts , screws , and studs , inch and metric series
英制及米制系列的螺栓螺钉及螺柱的表面不均匀性的标准规范