The 1557HPL is an aluminum inner panel designed to fit Hammond 1557 series enclosures with part numbers starting with 1557H. It is aimed at electronics designers, OEM engineers and integrators who want a removable mounting plate for circuit boards, terminal blocks or small components inside a 1557H enclosure.

The panel is made from 0.081 in thick aluminum and the part page lists its nominal size as 7.36 in x 7.36 in x 0.08 in (187 mm x 187 mm x 2 mm). On the part drawing the panel measures 182.00 mm (7.17 in) by 182.00 mm (7.17 in) overall, with a thickness call-out of 2.05 mm (0.08 in) and a 2.30 x 40.8° corner chamfer. Shipping weight is 0.32 lbs (0.15 kg), and it is packed in a bag.

The purchased assembly includes the aluminum panel and 4 screws, the hardware needed to mount the panel to the inside of the enclosure. The drawing lists a recommended cover screw torque of 57-71 ozf-in (40-50 cN-m), and names SC526-50 (Steel P.C. Board Screw, #6 x 1/4 in self tapping, pkg 50) as a related accessory.

The 1557HPL can be factory modified (milling, drilling, printing and similar work), and solid models of the part are available in .stp or .x_t format. It is RoHS compliant and REACH compliant, and is identified by UPC 623980002606.