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A Robertson screw, also known as a square screw [1] or Scrulox, [2] is a type of screw with a square-shaped socket in the screw head and a corresponding square protrusion on the tool. Both the tool and socket have a slight taper .
In 1961 the company was renamed 'Avdel' and substantial growth throughout the next two decades saw it become one of the world's largest manufacturers of blind fasteners and installation tools. Expansion of the group was most significant in the 60s, 70s and 80s with several new facilities established in Europe, USA and the Asia Pacific region.
The catastrophic failure was caused by improper fasteners (nuts) installed on the valve. Shipyard workers accidentally installed brass fasteners that had a black oxide finish on them, resembling the hardened steel nuts that should have been used. This type of fasteners cam to be known as BOBCTF's. BLACK OXIDE BRASS COATED THREADED FASTENERS.
The amount of rotation required to achieve full closure depends on the number of unthreaded sectors. The minimum balanced arrangement has two sectors of 90°, and requires 1/4 turn to lock. three sectors of 60° requires 1/6 turn to lock, and the typical arrangement on a diving helmet, four sectors of 45°, requires 1/8 turn to lock. [2]
The screw itself should be drilled a minimum of 1" into the concrete to hold effectively and a maximum of 1-3/4" or the threads will wear and will lose holding power. Ideally 1-1/4" to 1-1/2" of screw thread in the concrete. [1] So for example, if a 1/2" board is being screwed onto the concrete, a 1-3/4" to 2" concrete screw should be used ...
YouTube Shorts is the short-form section of the online video-sharing platform YouTube. YouTube Shorts focuses on vertical videos that are of less than 180 seconds duration, and has various features for user interaction.
Born in Invercargill, New Zealand on 8 November 1905, Hazlett was the son of Kate Hazlett (née Stephenson), whose father John Stephenson was one of the founders of Wright Stephenson, and William Thomas Hazlett, a merchant and landholder. [1] He was educated at Waitaki Boys' High School. [2] He married Joan Marion Nicoll at Ashburton on 4 ...
[1] The company developed a number of improvements to what became the modern desk stapler. It is a subsidiary of Stanley Black & Decker. In August 2013, Stanley Black & Decker began selling tradesmen’s power tools and mechanics’ hand tools and pneumatic tools under the Bostitch brand at Walmart stores and online distributors. [2] [3]