Black Box FM593 Cat5e Shielded Keystone Coupler

When a Cat5e link needs to be extended without reworking the cable path, this shielded keystone coupler keeps the connection simple and controlled. Black Box FM593 uses a straight-pin RJ-45 female-to-female design that supports in-line joining of two patch cables while fitting standard keystone openings in patch panels and wall plates. The shielded construction is the key differentiator here. In environments where cable bundles are tight and EMI exposure matters, shielding helps maintain signal integrity better than an unshielded coupler. The silver finish blends into professional hardware layouts, and the compact keystone form factor makes it easy to standardize across dense installations. Like other Black Box infrastructure components, this coupler is built for procurement environments that expect clear compliance and long service life. It is TAA compliant, RoHS compliant, and backed by a lifetime limited warranty. For teams that need a small part to solve a real cabling problem without introducing noise, downtime, or unnecessary cable replacement, FM593 is the right kind of simple.