Patent ID: 9366032
Filing Date: 2016-06-14
CPC Classification: E04C,Y10T

Claim Text:
1. A thread rolling fixed length spiral rib steel wire, comprising: a 2.5 m long spiral rib prestressed steel wire, where both ends of said steel wire respectively having a continuous thread section, wherein the continuous thread section applies external thread and occupies 30±2 mm of said steel wire; wherein, the surface of said steel wire between the two continuous thread sections has four parallel winding spiral ribs whose cross section is trapezoidal and lead is 41-55 mm, the nominal diameter of said steel wire is 9.5 mm, 10.0 mm, or 10.5 mm, and the elastic limit of said steel wire is larger than 1200 N/mm 2 ; wherein the four spiral ribs form a horizontally and vertically symmetrical cross bulged around a base circle on a cross section of the steel wire.