JIS G3445 Mechanical tubes

JIS G 3445 Carbon steel tubes for machine structural purposes

JIS G 3445,This japanese standard specifies the carbon steel tubes used for machinery,automobiles,bicycles,furniture,appliances and other machine parts.

Grade(mainly used): STKM11A, STKM12(A,B,C),STKM13(A,B,C),STKM14(A,B,C)

Outer Dimensions: 19.05mm ~ 114.3mm

Wall Thickness:2.0mm ~ 14 mm

Length: max 16000mm

Application:machines, automobiles, bicycles, furniture, tools and utensils, and other machine parts.

JIS G 3445 Chemical Composition

Table 2 Mechanical Property

Tolerances on outside diameter:

No 1:when outer diameter <50mm, tolerance 0.5mm;when outer diameter ≥50 mm,tolerance +/- 0.1mm;

No 2:when outer diameter <50mm, tolerance 0.25mm;when outer diameter ≥50 mm,tolerance +/- 0.5mm;

No 3:when outer diameter <25mm, tolerance 0.12mm;when 25mm ≤od ≥40 mm,tolerance +/- 0.15mm;when 40mm ≤od ≥50 mm,tolerance +/- 0.18mm.

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