55°密封管螺纹量规
Gauges for pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads
2019-08-27
JBT10031-2019
55°密封管螺纹量规
2019-08-02
GB/T 10922-2006
55°非密封管螺纹量规
Gauges for pipe threads with 55 degree thread angle where pressure-tight joints are not made on the threads
2006-02-05
GB/T 22091.1-2008
55°密封管螺纹量规 第1部分：用于检验圆柱内螺纹与圆锥外螺纹
Gauges for pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads - Part 1:Verification of parallel internal and taper external threads