Structural Softwood and Hardwood Strength Classes

Strength class, bending stress and mean density

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Relationship between strength classes and physical properties for structural softwoods and hardwoods.

Strength Class Bending Strength (MPa) Mean Density (kg/m3)
C14 14 350
C16 16 370
C18 18 380
C20 20 390
C22 22 410
C24 24 420
C27 27 450
C30 30 460
C35 35 480
C40 40 500
C45 45 520
C50 50 550
D30 30 640
D35 35 670
D40 40 700
D50 50 780
D60 60 840
D70 70 1080
  • BS EN 338:2003

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  • Beams and Columns - Deflection and stress, moment of inertia, section modulus and technical information of beams and columns

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