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Durriya Kazi is a Karachi-based artist and heads the Department of Visual Studies at the University of Karachi.

On each screw shank is an asymmetrical thread that produces opposing forces during installation to create mating threads. Because these threads match the dimensions of the installed screw, there is no play between the material and screw, resulting in a dynamically safe joint. Coarse and fine threads are available, with the former recommended for weak materials.

Personally I find it funny since companies do mockups for demonstrations all the time. Wouldn’t at all surprise me if the card he was holding was such a mockup.

But while this concern can occasionally – although not always – be shallow in that it doesn’t always translate into action (some of us still shop at Zara right?), what is unwavering is the trust that consumers place in the words and opinions of others, over that of brand messaging. To put it another way, unbiased peer reviews trump advertising… Every Single Time.

If a maximum stress limit for the joint material is exceeded, then deformation occurs over a period of time. This leads to the extension being lost in the bolt, resulting in the clamp force subsequently being reduced.

This should raise the question as to why some tapped holes have significantly more than six threads. Because the material into which holes are tapped often has less strength than the mating screw, that material can yield before the screw does. Looking at Figure 6, one can imagine if the surface of the most highly stressed thread crushed even minutely, load would then be transferred down the line of threads, causing partial leveling of individual thread stress. This is how additional threads are engaged.

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“The legacy fastener approach is too often put in place where we need to consider future cost savings, which isn’t the same as present cost avoidances,” explains Simpson. “Because a fastener has worked fine on many parts in the past, the company immediately wants to use it in new parts as well. But, what if the part is being installed in a new type of plastic they’ve just started using? Maybe a better option is available.”

Excellent advertising supplement (1947-2017). Reminds one of the good old days.Salute to Dawn for bringing history back .