Carbon Steel Tubes for Mechanical Structure
CNS 4437 JIS G3445
Thickness tolerance of thickness under 3mm is plus or minus 0.3 mm, and thickness over 3mm is plus or minus 10%.
Outside diameter tolerance of outside diameter under 50mm is plus or minus 0.25 mm, and outside diameter over 50mm is plus or minus 0.5%.
| Grade | Designation |
|---|---|
| 11A | STKM 11A |
| 12A | STKM 12A |
| 12B | STKM 12B |
| 12C | STKM 12C |
| 13A | STKM 13A |
| 13B | STKM13B |
| 13C | STKM 13C |
All the tolerance above is according to JIS.
Length tolerance is plus 25mm or minus 0mm, and it can be made on demand if you have special needs.
