Hammond 1594RFIABK 56 mm Square EMI/RFI Shielded Conductive Plastic Box

The 1594RFIABK is the smallest size in the 1594RFI thick-wall enclosure family: a square, black plastic box molded from conductive plastic for EMI/RFI shielding applications. It is aimed at electronics designers and OEM engineers who need a compact housing for a small circuit that must emit less interference, or be less affected by outside interference, without moving to a metal case.

The material is a conductive compound of stainless steel fibers and flame retardant ABS plastic, carrying a UL flammability rating of 94V-0. The walls are thick, with an average wall thickness of 0.13 in (3.3 mm) quoted for the series and 3.10 mm on the part drawing, and the outside has a matte textured black finish. The material is brittle, similar to phenolic, so it is not for high impact use.

The ordering table lists this size at 2.20 in (56 mm) long by 2.20 in (56 mm) wide by 1.57 in (40 mm) deep, while the part page gives a nominal 2.2 x 2.2 x 1.1 in (56 x 56 x 28 mm). The drawing shows a narrowest inside dimension of 46.67 mm and an inner box height of 34.30 mm. It ships at 0.13 lbs (0.06 kg).

The countersunk lid is secured with four M3-0.5 x 18mm long Philips machine screws threaded into integral brass bushings, and the enclosure is designed to meet IP54. Replacement screws come in packs of 100 as 1594MS100. Because the case is conductive, treat 1594RFIABK like a metal enclosure: it is not an insulator, and significant current flow will heat the plastic and produce smoke. It is REACH and RoHS compliant.