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| Chinese National Standard List: Plug screws, pipe fittings |
| Title | Standard No. | Implemented On |
| 24°cone connectors—Male run tee—Body | QC/T 400-2013 | 2013-9-1 |
| Hexagon outside head cone plugs | QC/T 381-2013 | 2013-9-1 |
| Flared couplings—Male branch tee—Body | QC/T 405-2013 | 2013-9-1 |
| 24°cone connectors—Male elbow—Body | QC/T 401-2013 | 2013-9-1 |
| 24°cone connectors—Male—Body | QC/T 399-2013 | 2013-9-1 |
| Flared couplings—Male elbow—Body | QC/T 404-2013 | 2013-9-1 |
| Hexagon outside head cone plugs with magnetic core | QC/T 383-2013 | 2013-9-1 |
| Hexagon countersunk headless cone plugs | QC/T 378-2013 | 2013-9-1 |
| Square head cone plugs | QC/T 379-2013 | 2013-9-1 |
| 24°cone connectors—Male branch tee—Body | QC/T 402-2013 | 2013-9-1 |
| High pressure pipelines for compressed natural vehicles | QC/T 746-2006 | 2006-8-1 |
| Sheet metal formability and test methods | GB/T 7330-1998 | 1998-1-2 |
| Double Pipe Clip with Both Ends Fixed | TB/T 1261-1991 | 1992-1-1 |
| Double Pipe Clip with Middle Fixed | TB/T 1262-1991 | 1992-1-1 |
| Copy Parchment | QB/T 1017-1991 | 1992-1-1 |
| Reducing Double Pipe Clip | TB/T 1263-1991 | 1992-1-1 |
| Dual steelwire type strap | QC/T 390-1999 | 1988-6-1 |
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