On Standard Spcs. For Bonnell Mettress The coil not be out shape! knotting without error

Mechanical Compositon:C:0.65 Mn:0.61 Si:0.17 S:(max.0.008 P(max.)0.015

Tensile Strength( N/mm2):1660~1960

Twist Times:26~28

Spring Turn:4~6

External Spring(Ø):60~90mm

Middle Spring(Ø):30~57mm

Elongation:hard

Packing on pellets:it will be packed for by sea shipping.

Mattress spring