RB · Round Bars

40RB

40RB Round Bar

  • AS/NZS 3679.1:2016
  • Design: AS 4100:2020
  • Unverified
Weight Surface area Equivalents XML
Mass9.86kg/m
A1,257mm²
Ix0.12610⁶ mm⁴
Zx6.310³ mm³
40RB cross-section
Cross-section drawn to scale from nominal dimensions. Cross-hair marks the centroid.

Dimensions

ParameterSymbolValueUnitData
Outside diameterD40.0mmU

Section Properties

ParameterSymbolValueUnitData
General
Mass per metre mass9.86kg/mC
Gross area A1,257mm²C
About x-axis (major)
Second moment of area Ix Ix0.12610⁶ mm⁴C
Elastic section modulus Zx (min) Zx6.310³ mm³C
Plastic section modulus Sx Sx10.710³ mm³C
Radius of gyration rx rx10.0mmC
Torsion & warping
Torsion constant JExact (πD⁴/32) J0.25110⁶ mm⁴C
Surface area
External surface area extArea0.126m²/mC

Steel Grades

GradeStandard fy MPafu MPa NoteData
300 AS/NZS 3679.1:2016 280 440 Typical grade supplied – confirm availability with supplier U

Strengths shown for governing thickness t = 40.0 mm. Density 7850 kg/m³, E = 200 000 MPa.

Source & Verification

Source publisher
Pending verification – nominal dimensions entered by the application developer
Source document
AS/NZS 3679.1:2016 Structural steel – Hot-rolled bars and sections
Edition
2016
Publication year
2016
Page reference
—
Last updated
2026-10-12
Verification status
Unverified

Nominal dimensions require verification against the current edition of the product standard and the manufacturer catalogue before design use. Properties are calculated by this application from the nominal dimensions.

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