ISO 16249 pdf download

ISO 16249 pdf download Springs — Symbols
Scope
This International Standard specifies general principles forthe creation ofsymbols ofphysical quantitiescoefficients,and parameters for metalsprings.ltspecifiesthe presentation ofbasic characters,subscriptsand application symbols for use in the field of helical compression springs, helical extension springsnelical torsion springs, flat springs, and leaf springs with attention to technical product documentationespecially for describing and ordering.
2 Normative references
The following documents,in whole or in part, are normatively referenced in this document and areindispensable for its application. For dated references, only the edition cited applies. For undatedreferences, the latest edition of the referenced document (including any amendments) applies.
ISO 26909,Springs- Vocabulary
ISO 80000-1, Quantities and units – Part 1: GeneralISO 80000-4, Quantities and units – Part 4: Mechanics
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 26909 and the following apply.3.1
basic character
main part of spring symbols representing physical quantities, coefficients, and parameters of springs
3.2subscriptsecond part of spring symbols that follows basic characters in order to modify the physical quantities,coefficients, and parameters with respect to properties, feature, numbering, etc.
3.3
application svmbolcombination ofbasic character and subscript
EXAMPLEApplication symbol
4 Composition of spring symbols
4.1 General
Simple spring symbols consist of basic characters alone. Subscripts may be added to these basic characters to create more complex symbols.
Quantities and units used are specified in accordance with ISO 80000-1 and ISO 80000-4.
For the purpose of international applicability, all basic characters and subscripts should be derivedfrom English words, and designations used in technical literature up to the time of publication of thisnternational Standard are adopted as far as possible. Wide conformity of the symbols for springs hasbeen attempted.
The characters that are permitted to be used for spring symbols are Latin letters (upper case or lowercase), Greek letters (upper case or lower case), and Arabic numbers.
NOTE 1 As there is a risk of confusion with the Arabic number 0, the following Latin letters have not beenspecified: 0 (upper case letter), o (lower case letter).
NOTE 2As there is a risk of confusion with Latin letters,the following Greek letters have not been specified:A.B,E,Z, H,I KK,MN Oo, P T Y and X
4.2 Basic characters
Basic characters consist of one upper case letter or lower case letter written in Latin or Greek alphabet.The letter should be derived from the corresponding spring term or designation in English
Variables shall be in italic typeface.
EXAMPLESD for coil diameter, t for torsional stress
4.3Subscripts
Subscripts consist of one two or three letters, digits, or letter/digit combinations of Latin letters, Greeketters or Arabic numbers.
EXAMPLE 1De (e: one letter)
EXAMPLE 2A.0 (LO: two letters)
EXAMPLE 3dmax (max:three letters)