Threads of container flange bolts and pipeline flange bolts
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The bolts used for container flanges have threads only on two ends, whereas the bolts used for pipe flanges have threads all around. Which is better: fully threaded or only threaded at both ends?
It has been concluded that full-thread is the best!
There’s no such strict requirement, right? As long as the conditions are met, it should be fine!
Behind the container flange, there are three types of studs: ABC, with ABC being the best in order. c represents a fully threaded design
This post was last edited by zhangjuhua on 2019-8-19 at 12:29. Container flanges generally use studs, usually in accordance with NB/T47027; there are those with two ends, and of course there are also those that are fully threaded, depending on the requirements. Pipe flanges do not necessarily require fully threaded studs either – it depends on the needs. Hex head bolts GB/T5782 are not fully threaded, while GB/T5783 is fully threaded but not double-ended. HGT20613 is a double-ended, fully threaded type. Previously, GB/T901 was used for double-ended, non-full-threaded studs in pipe flanges, but it seems to be used less now. The original code for manholes was ‘s’; this code has been removed in the newer versions of manholes
Full-threaded ones are one grade higher; different bolts have their respective application ranges. Take a look at the requirements in 20592
A screw with threads on both ends is better.