Compression spring parameters

Physical parameters

**d (wire diameter):**This parameter describes the diameter of wire used as material for spring.**S (shaft):**This parameter describes the maximum diameter of spring shaft in industrial applications. Tolerance for this parameter is (+-)2%(indicative).**Di (internal diameter):**Internal diameter of a spring can be calculated by subtracting the doubled wire diameter from the external diameter of a spring. Tolerance for this parameter is (+-)2%(indicative).**De (external diameter):**External diameter of a spring can be calculated by adding the doubled wire diameter to the internal diameter of a spring. Tolerance for this parameter is (+-)2%(indicative).**H (hole):**This is the minimum diameter of the hole in which spring can work. Tolerance for this parameter is (+-)2%(indicative).**P (pitch):**Average distance between two subsequent active coils of a spring. Tolerance for this parameter is (+-)2%(indicative).**Lc (block length):**Maximal length of a spring after total blocking. This parameter is shown in the picture on right. Tolerance for this parameter is (+-)15%(indicative).**Ln (allowable length):**The maximum permitted length of a spring after loading. If deflection is higher it may cause plastic deformation (the non-reversible change of shape in response to an applied force). For many springs danger of deformation do not exists. In this case*Ln = Lc + Sa*, where*Sa*is the sum of minimum permissible spaces between active coils.**L0 (free length):**Free length of compression springs is measured in its uncompressed state after previous one time blocking. Tolerance for this parameter is (+-)2%(indicative).**Nr of coils:**This is a total number of coils in a spring - in the picture above it is equal to six. To calculate number of active coils substract two terminating coils from total number of coils.**R (spring rate):**This parameter determines spring's resistance, while it is working. It is measured in 1 DaN/mm = 10 N/mm. Tolerance for this parameter is (+-)15%(indicative).**L1 & F1 (length at force F):**Force F1 at length L1 can be calculated from equation :. Equation derrived from previous for calculating*F1 = (L0-L1) * R*.*L1 : L1 = L0 - F1/R***Grinding:**Defines whether or not the ends of a spring are ground.**Reference Number:**All springs are identified by a unique reference:; for compression springs, the type is a letter "**type . (De * 10) . (d * 100) . (L0 * 10) . Material**", materials are identified by following letters described below: "*C*" , "*A*", "*I*" , and "*N*". Example:*S*is a compression spring with an external diameter of 6.3 mm and a free length of 10mm, produced from 0.9mm music wire.**C.063.090.0100.A**

Materials

**A (Music Wire):**Steel that conforms to the EN 10270-1 class SH standard.**I (Inox steel):**Inox 18/8 mark Z10 CN 18.09.**N (Zn coated wire):**Zinc coated wire for springs**S (Cr-Si Steel):**Cr-Si Steel. Springs created from this material have better endurance and spring rate.**These parts will be available from 2005-03-01**

Characteristics

**Ends:**All compression springs have flat ends.**Spring rate:**Tolerance for spring rate is (+-)15%(indicative).

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