![]() ♥ Available in 4 colors - Silver, Gunmetal, Bronze, Gold They feature a 16mm bezel setting and work perfectly with our 16mm round glass or epoxy domes (sold separately). If ever in doubt, please seek advice from an engineer.16mm tie bars are a wonderful way to display your personalized images. Please note that this advice and the comments herein are general in nature. This is so when used in a wall formwork application any excessive vibration does not cause the wingnut to unwound itself as gravity prevents the wing completing a full rotation. Why does a 15mm wing nut only have one wing? We have tested 15mm z-bar wing nuts as a hook (often referred to as a reverse wing nut) and have given them a working load limit of 10kN when hooked onto a 16mm reo bar or similar. It does not mean they have an unlimited life span and when they are looking worn, they should be scrapped. It is recommended to visually inspect the bar and nut threadsįor wear or deformation prior to use. We have successfully completed cycle testing on z-bar and z-bar accessories where we apply the working load limit, hold this load for 5 mins and continue this procedure for more than 20 times, then we finally take the z-bar to failure and there is no effect on performance if used in the correct manner. The time it takes for it to yield (reach a point at which it will no longer support load and begin to neck) and failure can be in the matter of seconds. A 20mm z-bar does neck to about 13mm prior to failure. ![]() Z-bar however does stretch slightly before failure and the failure does exhibit some necking as shown in the below photo. Because of the high strength of steel used in the thru tie bar, if a bar does snap there will be no warning sign. These will generally slip and destroy the thread before the z-bar snaps, and this is because the z-bar nuts are a softer cast steel. The limiting element is typically the z-bar nuts. Generally, z-bar is the strongest element of the thru-tie system. It is however still used because it does provide a small factor of safety and it is rare the safety nut doesn’t work. While we do this regularly, because of the course speed thread on the bar, the second nut can become loose.
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