Acme Screw Thread Profile by Wizard191 CC-BY-SA 3.0 Screw thread profiles can be modified from the standard V profile for better performance under different loads. The Acme profile, a trapezoidal ...

Once the self-drilling screw pierces the metal, it forms or cuts threads the same way as standard tapping screws.

The study has discovered that the Crystal Palace was the first building known to have made use of a standard screw thread -- something that's now taken for granted in modern construction and ...

Paxton's design called for 30,000 nuts and bolts; screws with a consistent thread form would have streamlined the construction process considerably. James Whitworth had proposed a common standard ...

Scientific American is part of Springer Nature, which owns or has commercial relations with thousands of scientific publications (many of them can be found at www ...

“The forms of screw threads used in Crystal Palace buildings ... An original nut fits a newly manufactured bolt made to British Standard Whitworth. Credit: John Gardner Gardner found the ...

Despite being standardised in the late 1800s, BA threads, the British Association threads used in old electrical equipment, including vehicle magnetos, are based on the metric system. A BA0 bolt has ...