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stress grade

Standards
a classification assigned to structural timber or wood products that indicates a suite of characteristic values of strength and stiffness properties suitable for structural design
Typical examples of stress grades are—
  1. (a) F-grades for sawn timber as given in Table H2.1 of Appendix H;
  2. (b) MGP grades for sawn timber as given in Table H3.1 of Appendix H;
  3. (c) A17 grades for sawn timber as given in Table H3.1 of Appendix H;
  4. (d) F-grades for plywood as given in Table 5.1;
  5. (e) GL grades for glued laminated timber as given in Table 7.1; and
  6. (f) proprietary stress grades detailed in a manufacturer’s product specification.
Source - AS 1720.1-2010: Timber structures
Standards
the classification of timber to indicate, for the purposes of design, a set of structural design properties in accordance with AS 1720.1
Source - AS 1684.4-2010: Residential timber-framed construction
HB50
classification of the basic working stress in bending for structural timber by visual or mechanical ‘stress grading’ to indicate the likely strength and stiffness of a section and, by implication, other mechanical properties for structural design purposes
The stress grade is designated by an ‘F’ number, such as ‘F7’ which indicates a basic working stress in bending for such a grade of approximately 7 megapascals (MPa). Stress grades range from F2 to F34. The general range for timber framing in unseasoned timber is from F4 to F22, and for seasoned timber from F5 to F27. Span tables have been prepared to facilitate the choice of appropriate grades and sizes for a wide range of span and load conditions.