This European Standard specifies a method of strength grading tropical hardwood visually for structural use. Visual strength grading is carried out by competent persons, or people working within a company under the close supervision of competent persons. The permissible limits of characteristics for a single visual strength grade of timber are specified, designated Structural Tropical Hardwood (STH) grade. The method is only suitable for pieces of timber with a rectangular cross-section that is constant along their lengths. This standard meets the requirements given in EN 14081-1 for a visual strength grading standard.