There will be weight reduction on account of smaller size of the component parts since the cylindrical heads of socket screws need less space than hex heads and require no additional wrench space. There is weight reduction as fewer screws are used. As fewer screws are required for a given job, fewer holes are required to be drilled and tapped. 
As compared to ordinary fasteners, less socket screws of the same size can achieve the same clamping force in a joint. The term 1936-Series was selected to identify the older style for replacement requirement. Eventually, these relationships were accepted as industry standards and the year of acceptance – 1960 – was adopted to identify the optimized designs. These studies resulted consistent dimensional relationships throughout the size range. In the 1950s, one socket screw manufacturer in America performed extensive studies to optimize performance based on geometry, fastener material strength, and applications. This limited the performance potential of some sizes. The original configuration of socket head cap screws didn't maintain consistent relationships among the nominal shank diameter, head diameter, and socket size throughout the available size range. In this article information is given on 19-Series socket head cap screws, advantages of socket head cap screws, product and dimensions standards, advantages of Unbrako socket head cap screws, information on metric socket head cap screws made by Unbrako as per ANSI standard and countersunk head screws with hexagon socket. The most important reasons for the increasing use of socket head cap screws in industry are safety, reliability and economy. They are used for critical vehicle applications, machine tools, tools and dies, earth moving and mining machinery, and a wide range of engineering applications. 
They have cylindrical head and internal wrenching features (mostly hexagon socket) that allow them to be used in locations where externally wrenched fasteners aren't desirable. Socket head cap screws are used for applications with limited space.
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