| Nwydd | Eitemau | Safonol | Gradd dur | OD&W.T. ystod |
| Tiwbiau ar gyfer Strwythurol Dibenion & Pibell Gyffredin | Tiwb dur sgwâr | GB/T 3091 | GR.A, GR.B, GR.C St37,st52 S235JRH,S355J0H SS400, A36 | (20*20-500*500mm)X (1-16mm) |
| GB/T 6728 | ||||
| ASTM A513 | ||||
| JIS G 3444 | ||||
| ASTM A500 | ||||
| Tiwb dur hirsgwar | BS A500 | (20*30-450*500)*(1-20mm)X (1.0mm-16mm) | ||
| EN 10219 | ||||
| Pibell ddur crwn | ASTM A53 | (21.3-219mm)*(1.2-12mm) | ||
| EN 10225 | ||||
| Pibell Galfanedig dip poeth | Pibell ddur crwn | BS 1387 | GR.A, GR.B, GR.C St37,st52 S235JRH,S355J0H SS400, A36 | (21.3-219mm)*(1.2-12mm) |
| ISO 65 | ||||
| ASTM A53 | ||||
| EN 10240 | ||||
| Sgwâr a Phetryal | GB/T 3091 | (20*20-500*500mm)*(1.{4}}mm) |



Tagiau poblogaidd: tiwb sgwâr galfanedig, Tsieina, cyflenwyr, gweithgynhyrchwyr, ffatri, pris