Standardization and Specialization

I am a couple dozen episodes in on Dave Broker's Industrial Revolutions Podcast and cam across this tidbit from chapter 14.

But what Whitworth was most famous for was something called British Standard Whitworth – BSW.

Up until this point, different machine tool makers used different designs for their tools. For the end users – really, anyone involved in industry by this point – it was maddening. If you had a steam engine made by Company X, for example, and one of the screws was damaged, it could only be replaced with a screw provided by Company X or the vendor for Company X. Otherwise the screw wouldn’t fit.

Along with Clement, Roberts, and other Maudslay alumni, Whitworth was a strong proponent for standardization such parts – nuts, bolts, and screws. So, in 1841, he sat down and wrote up what he thought should be the standards. Screw threads should be set at a 55 degree angle with very specific depths and radii. By the 1870s, as the railroads became increasingly frustrated with the different systems being used, they said, “yeah, Whitworth was right.” By the 1890s, everyone was using BSW.

With BSW standardization, a steam engine maker need not produce all of the screws, rivets, fasteners, and other minor parts. Outsourcing these components allowed him to focus on improving the steam engine and the component makers to improve production. Economies of scale in, say, screw manufacturing unleashed by dis-integration would drive costs down dramatically.

I recommend the podcast to fellow history buffs and I am sure I will mine it for future blog posts.