Vanel Company produces compression springs from chrome-silisium steel, which guarantees better endurance and greater spring rate.
Zinc coated springs
Zinc coated springs are available from stock. It is important to note, that this kind of spring has the same parameters as a normal steel spring. This kind of springs is corrosion proof and cheaper than stainless steel.
Compression spring 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.
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 : F1 = (L0-L1) * R. Equation derrived from previous for calculating 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: type . (De * 10) . (d * 100) . (L0 * 10) . Material ; for compression springs, the type is a letter "C", materials are identified by following letters described below: "A" , "I", "N" , and "S". Example: C.063.090.0100.A is a compression spring with an external diameter of 6.3 mm and a free length of 10mm, produced from 0.9mm music wire.
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
Ends: All compression springs have closed ends exept springs with the length 360mm.
Spring rate: Tolerance for spring rate is (+-)15%(indicative).