The world of miniature contacts is quite amazing. Pictured above is a special test socket with formed micro contact bumps that are .005 inch (0.127mm) in diameter. There are quite a number of processes used in creating this miniature structure involving photo chemical machining and miniature “bump forming techniques” (for lack of a better word).
To give everyone a concept of how small these micro bumps really are, the picture on the left is the actual size (not a thumbnail image) of the test socket. Simply amazing how small things are getting. Many of these types of devices are used in products for the military, aerospace, communications, and a host of other high tech industries. Photos courtesy of E-FAB.