Macalloy AB WindForce

Strength

The mechanical properties of the Macalloy 1030 bars can be found in our downloadable brochure.

Bars are supplied with a range of fittings, including nuts, washers, plates and couplers. Spherical nuts and washers are also available to accommodate up to 3 degrees of rotation. All fittings are designed to exceed the failing load of the threaded bars.

The specified characteristic failing load and 0.1% proof load for the Macalloy 1030 bar are also given in our downloadable brochure.

Relaxation

The requirements laid down in BS4486 for the loss of stress due to relaxation in a bar loaded to

70% of its characteristic failure load, after 1000 hours at room temperature, is 3.5% maximum.

Macalloy carries out tests in its own test house along with independent audit tests, the results of which show the bars comfortably achieve results below 3.0%.

Lock Off Losses

The ‘lock off’ losses exhibited with the Macalloy 1030 bar are typically 0.5mm if the load is cycled and

locked off several times. This can be reduced even further if a torque is applied to the nut after the final load cycle.