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<p>[QUOTE=&quot;leeddie, post: 215172, member: 3680&quot;]Here is a little bit of history on the hex nut, which would fit your chest&#039;s date if late 19th century.&nbsp; </p><p><br /></p><p><br /></p><p><font size="5"><b>Mass Production</b></font></p><ul> <li>In 1830 James Nasmyth, an assistant to Henry Maudslay, designed a pioneering milling attachment for Maudslay&#039;s bench lathe to make a large batch of hex-head bolts for a scale model they were building for the London Science Museum. By the 1840s, cold-heading machines became available for stamping metal. It took until the 1880s, when Bessemer steel mills began producing the new mild steel in accurate thicknesses and quantity, before cold-heading machines began punching out hex nuts. This innovation meant that nuts stamped from flat metal stock and machined to exact tolerances could be screwed onto bolts made by the new screw-making machines in mills anywhere in the country. Larger hex nuts quickly replaced square bolt heads in heavy industrial applications.<br /> </li> </ul><p>Here is the link if you would like to see more info. </p><p><br /></p><p><a href="http://www.ehow.com/info_12194415_history-hex-head-nuts-bolts.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.ehow.com/info_12194415_history-hex-head-nuts-bolts.html" rel="nofollow">http://www.ehow.com/info_12194415_history-hex-head-nuts-bolts.html</a>[/QUOTE]</p><p><br /></p>

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