Defined as boards (доски), bars (бруски), and beams (брусья). Quality Grades:
is the primary interstate standard for sawn softwood (coniferous) lumber, such as pine, spruce, larch, cedar, and fir. While you asked about the 1957 version ( GOST 8486-57 ), it has been superseded by subsequent revisions, most notably GOST 8486-86 , which remains the current standard for technical requirements in many CIS countries. Key Classifications and Grades gost 8486 57
The highest quality, primarily for export or high-end joinery. Defined as boards (доски)