#protoUnmoderated tagAll postsExplore CommunitiesTrending CommunitiesNewcomers' CommunitySteemitCryptoAcademySteemit Feedbackআমার বাংলা ব্লগSteem AllianceKorea • 한국 • KR • KOBeauty of CreativityTron Fan ClubAVLE 일상Comunidad LatinaSTEEM CN/中文WORLD OF XPILAR#protoTrendingHotNewPayoutsMutedddjfoid100 (32)in #proto • 12 days agoWhat Is a Ra 0.4 Surface Finish?A Ra 0.4 surface finish is an ultra-smooth, precision-machined surface roughness level used when parts need low…