The SR-3550B is a snap rivet used for fastening components in various assemblies. It is designed to accommodate a total holding thickness from 0.106 to 0.142 inches (2.7 to 3.6 mm). This rivet has a head dimension ('A') of 0.20 inches (5.0 mm) and a length ('B') of 0.28 inches (7.1 mm). The standard material is Nylon 6 (RMS-52), and the 'B' suffix in the part number indicates it is the black version. Snap rivets are ideal for quick, tool-free installation in applications like electronic enclosures or panels.