We maintain a strict quality control by submitting our product to rigorous tests according to international standards ASTM-A407 and JIS-G3521 in our Quality Laboratory.

Standar ASTM A-407 Steel wire, cold drawn, for spiral type spring.

Standard Specification for Steel Wire, Cold-Drawn, for Coiled-Type Springs. This standard establishes specifications round wire, cold drawn, with expected quality properties and manufacturing steel springs Upholstery Types:

  • Type A—Coiled (Marshall pack).
  • Type B—Coiled and knotted.
  • Type C – Coiled and knotted (offset style).
  • Type D – Coiled and hooked (single and cross helicals).
  • Type E – Coiled and hooked (short tension—regular tensile strength).
  • Type F – Coiled and hooked (short tension—high tensile strength).
  • Type G – Regular lacing.
  • Type H – Automaticlacing.
  • These types of upholstery springs are used in the manufacture of bed spring units, mattresses, furniture cushions, and automobile seats. This wire is not intended for the manufacture of mechanical springs.

Standar JIS G3521 This Japanese industrial standard specifies the hard drawn Steel wires, hereafter referred to as the "wires".

1. Applicable standards to this standard are as follows:

  • JIS G3506 High Carbon Steel wire Rods.
  • JIS Z2241 Method of tensile test for metallic materials.

2. Corresponding International Standards to this Standard are as follows:

  • ISO 3458-1: 1989 Steel wire for mechanical springs (part 1).
  • ISO 3458-2: 1989 Steel wire for mechanical springs (part 2).