GEWI ® Threadbar System High Yield Steel for Reinforcement of Concrete

GEWI ® Threadbar System

High Yield Steel for Reinforcement of Concrete

Key features of the system:

  • Fully threaded bar - can be cut and coupled at any point.
  • Robust thread - ideal for use on construction sites
  • Coarse pitch threadform with two flats ensures self-cleaning of thread
  • Fully galvanized systems - galvanized threadbars and accessories also available from stock.

The GEWI ® Threadbar System consists of high yield GEWI ® screwable steel and corresponding coupling and anchoring accessories, which enable safe and easy connections between anchorages made of GEWI ® steel. In accordance with the German approvals Z-1.5-76, Z-1.5-149 and Z-1.5-2.

GEWI ® Steel High Yield Threadbar is a high tensile alloy steel bar which features a coarse right-hand thread over its full length. The system has proved its efficiency around the world and ofters versatility in a range of applications. Manufactured in accordance with the German Certificate of Approval issued by the Deutsches Institut für Bautechnik, the system also ofters general conformance with BS 4449 : 1997 (Carbon Steel Bars for Prestressing of Concrete).

The minimum specified characteristic yield strength is 500 N/mm2 for bar diameters 16 - 50 mm and 555 N/mm2 for the 63.5 mm diameter bar. 16 - 50 mm bars can be welded using appropriate industry practices relative to the carbon content of the steel. Welding of the higher grade 63.5 mm diameter bar is not recommended.


GEWI ® bar Ø Steel grade yield fy/tensile strength ft Ultimate tensile force F Yield Force F1 Cross sectional area Diameter over threads bare weight
[mm] [N/mm2] [kN] [kN] [mm2] [mm] [kg/m]
16 500/550 111 100 210 19 1.58
20 500/550 173 157 314 23 2.47
25 500/550 270 245 491 29 3.85
28 500/550 339 308 616 32 4.83
32 500/550 442 402 804 36 6.31
40 500/550 691 628 1257 45 9.87
50 500/550 1080 982 1963 56 15.40
63.5 555/700 2219 1758 3167 69 24.80

(a) For geotechnical applications 75% of the ultimate tensile force Ft may be used for testing
Modulus of elasticity: E =205,000N/mm2 ± 5%.
Stock lengths: All bar diameters 12.0 m. Tolerances ± 100 mm. Speciallengths up to 15.0 m can be ordered.
All bar diameters can be cut to length to suit customer requirements, or can be supplied bent.