GEWI® Steel High Yield Threadbars are formed from a high tensile alloy steel. The bars are manufactured with a coarse left-hand thread over their full length. GEWI® couplers can provide a 100% load transfer between lengths of bar. The bar is also manufactured with flats on either side; these allow the self removal of dirt or debris as the bar is threaded into any female accessory, preventing cross threading and making it ideal for geotechnical applications.
GEWI® bar is manufactured in accordance with the German Certificate of Approval (Deutsches Institut für Bautechnik), the system also offers general conformance with BS 4449 : 2005 (Steel Reinforcement of Concrete).
The minimum specified characteristic yield strengths are:
- 500N/mm2 for bar diameters 16 - 50mm
- 555N/mm2 for bar diameters 57.5 - 63.5mm
16 - 50mm bars can be welded using appropriate industry practices relative to the carbon content of the steel. Welding of the higher grade 63.5mm diameter bar is also acceptable with additional measures.
The most common sizes of GEWI® bar used in rock-bolting applications are 25 - 32mm. The GEWI® product comes with a full range of accessories including eye-nuts, domed nuts & hemispherical washers, wedge bosses to increase head plate articulation and full strength couplers.
Modulus of Elasticity:
- E = 205,000N/mm2 +/- 5%
- Stock Lengths
- All bar diameters 12.0m. Tolerances +/- 100mm. Special lengths up to 18.0m are available to order.
All bar diameters can be cut to length to suit customer requirements or supplied bent to BS 8666 : 2000.