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Sheet metal forming, thread manufacturing, and other industrial operations may include moving parts, or contact surfaces made of stainless steel, aluminium, titanium, and other metals whose natural development of an external oxide layer through passivation increases their corrosion resistance but renders them particularly susceptible to galling.
Trashy Bags Africa is a commercial venture in Accra, Ghana, which turns plastic waste into reusable shopping bags, fashion accessories, school supplies, and other products. [ 1 ] The company employs about forty Ghanaian workers [ 2 ] [ 3 ] to collect, clean and stitch plastic trash in the form of sachets that contained water and other beverages.
Self-tapping screws can be divided into two classes: [3] those that displace material (especially plastic and thin metal sheets) without removing it, known as "thread-forming" self-tapping screws, and self-tappers with sharp cutting surfaces that remove the material as they are inserted, termed "thread-cutting" self-tapping screws.
TIME-SERT insert. A threaded insert, also known as a threaded bushing, is a fastener element that is inserted into an object to add a threaded hole. [1] They may be used to repair a stripped threaded hole, provide a durable threaded hole in a soft material, place a thread on a material too thin to accept it, mold or cast threads into a work piece thereby eliminating a machining operation, or ...
The advantage of a connecting nut over a standard nut in this application is that, due to its length, a greater number of threads are engaged with the bolt. [6] This helps to spread the force over a larger number of threads, which reduces the possibility of stripping or galling the threads under a heavy load.
This list comprises the largest companies currently in Africa by revenue as of 2022, excluding the finance sector, according to the ranking of the largest 500 companies in Africa by Jeune Afrique. In 2022, the largest company in Africa was Sonatrach with revenue of US$77 billion.