The 1590ZGRP121PL is the inner mounting panel for the 1590ZGRP121, the 122 mm x 120 mm x 90 mm glass reinforced polyester enclosure. The near-square steel plate gives panel builders and OEM engineers a solid mounting surface for components or circuit boards inside the enclosure.

The panel is 16 gauge galvanized steel measuring 108 mm x 107 mm x 2 mm (4.25 in x 4.21 in x 0.06 in), with a drawing thickness of 1.61 mm (.06 in) and 1.00 x 45° chamfered corners. It has six 7.00 mm (.28 in) holes, and it mounts onto the molded-in nuts of the enclosure's internal shelf.

Unlike the smaller 1590ZGRP panels, this one uses M6 hardware: the drawing lists the copper plated M6-1.0 x 6 mm mounting screw (SCGM6GRP), and the ordering table gives SCGM6GRP-20 as the extra panel screw pack. Panel mounting screws and washers are included, and the recommended panel screw torque is 45-50 cN-m (65-70 ozf-in).

The 1590ZGRP121PL is sold separately from the enclosure, ships in shrink wrap and weighs 0.28 lbs (0.13 kg). It can be ordered with the enclosure or added later to an installed box. It can be ordered with the enclosure or added later to an installed box.