In any cable or wire rope application, stretch may be a concern. There are two forms of stretch in cable and wire rope: Structural Stretch and Elastic Stretch.
Structural stretch is the lengthening of the lay in the construction of cable and wire rope as the individual wires adjust under load. Structural stretch in Loos and Company products is less than 1% of the total cable length. This form of stretch can be completely removed by applying a cable or wire rope prestretching operation prior to shipment.
Elastic stretch is the actual physical elongation of the individual wires under load. The elastic stretch can be calculated by using the following formula*:
Cable Stretch Calculator (E = (W x G) / D2)**
E = Elastic Stretch as a % of Length
W = Weight of load in pounds
D = Diameter of wire rope in inches
G = stretch Factor (See Chart Below)
|Wire Rope||"G Factor"||Wire Rope||"G" Factor|
|1x7 302 SS||0.0000735||1x7 Galv||0.00000661|
|1x19 302 SS||0.00000779||1x19 Galv||0.00000698|
|7x7 302 SS||0.0000120||7x7 Galv||0.0000107|
|7x19 302 SS||0.0000162||7x19 Galv||0.0000140|
|6x19 IWRC 302 SS||0.0000157||6x19 IWRC Galv||0.0000136|
|6x37 IWRC 302 SS||0.0000160||6x37 IWRC Galv||0.0000144|
|19x7 302 SS||0.0000197||19x7 Galv||0.0000178|
*Values derived from this calculator are an approximation.
**Remember to keep your units of measure constant. The length of your cable must be calculated in inches to correspond with the diameter measurement, also in inches.
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