TS 299

TS 299 is the Turkish version of the standard on preferred numbers and series of preferred numbers. In engineering and manufacturing, preferred-number series are predefined value sequences used to choose dimensions, ratings, capacities, and other numerical quantities in a systematic way. This standard addresses those numerical series as a general standardization tool for selecting values within product families and technical ranges.

Why preferred-number series matter

In general technical practice, preferred numbers reduce unnecessary proliferation of sizes by selecting values according to a structured progression rather than allowing every possible number. This supports clearer design rationales, easier stocking and procurement, and better compatibility across related products. The concept is widely used for nominal sizes, rated values, and standardized dimensional steps. TS 299 covers the series themselves; it does not need to be read as a full design code, but as the numerical framework behind harmonized selection.

Document scope and edition status

• The standard covers series of preferred numbers.
• It is recorded as equivalent to ISO/R 3.
• The listing is withdrawn, so it functions as a historical reference edition.
• Its classification sits under quantities and units, but it is not a units-definition standard in the narrow sense.

Preferred-number series support orderly technical standardization by making values repeatable, scalable, and easier to coordinate across related products. In that sense, the subject is broader than a simple list of numbers: it is part of the shared numerical language used in engineering design and product specification.