1. 
   Destructive tension testing at University of Toronto. Over a period of several years, dozens of models of early and later model Stavebolts® were subjected to these tension tests to determine the relative strengths and weaknesses of the device. As our manufacturing techniques improved, we broke the 3/4" tension bolts and stretched the HD pipe while preserving the integrity of the threaded section.



2. 
   A typical Stavebolt® connector, following tension testing. Note the elongation of the stitch bolt holes and the general stretching of the entire pipe section. This photo shows the malleable nature of the device, a very desirable quality for fasteners used in buildings designed to better resist high winds and seismic events.



3. 
   Performance testing proved conclusively that the weak link in the typical post to beam connection was not the connector itself. Rather it was the crushing of the wood fibres beneath the plate washer at the head of the tension bolt. Note that the Working Values increase as larger washers are applied, up to a point at which the safe working limit of the connection is established.



4. 
   Proof testing rig. This alignment and tension test rig is used to prove the integrity of each and every Stavebolt® leaving our shop. Thread quality and alinement, stitch bolt hole positioning and weld integrity are all verified with the help of this apparatus, prior to labelling and packaging in our shop at Midhurst.