标准摘要
[中文适用范围]： 本文件规定了R5系列公称孔径10mm至250mm的非刀口法兰真空管道配件（弯头、三通和四通）的安装尺寸。 [外文原描述]： This document specifies mounting dimensions for vacuum pipeline fittings (elbows, tees and crosses) of non knife-edge flange for nominal bores from 10 mm to 250 mm of the R5 series.
英文名称Vacuum technology — Mounting dimensions of pipeline fittings — Part 1: Non knife-edge flange type