The 1590ZGRP131PL is the steel inner mounting panel for the 1590ZGRP131 glass reinforced polyester enclosure. It gives installers a flat metal plate to mount PC boards, components or ground connections inside the slim 190 x 75 mm box, instead of fixing parts directly to the enclosure wall.

The panel measures 7.03 x 2.48 x 0.06 in (179 x 63 mm), and the drawing shows 1.61 mm [.06 in] galvanized steel, 16 gauge, with 1.00 x 45.0° chamfered corners. It sits on the enclosure's internal mounting shelf, which has molded-in bonding/mounting nuts.

The purchased assembly includes the panel mounting screws and washers. Additional copper ground hardware is available as SCGM4-50 (50 pack of M4 - 0.7 x 6mm screws with M4 washers), and the drawing lists the SCGM4 copper plated M4-0.7 x 6mm mounting screw as the matching accessory.

Hammond specifies a recommended panel screw torque of 45-50 cN-m [65-70 ozf-in]. The 1590ZGRP131PL is RoHS and REACH compliant, ships shrink wrapped at 0.28 lbs (0.13 kg). The drawing notes that factory modification (milling, drilling, printing etc.) is available and that solid models can be had in .stp or .x_t format. It is listed under UL file E65324.