The 1556HPL is a natural aluminum inner panel for the 200 x 200 mm enclosures in the 1556 Modern General Purpose series. It gives engineers and integrators a flat metal plate for mounting circuit boards and components inside the enclosure instead of fastening directly to the plastic.

The series ordering table pairs the 1556HPL with both the 45 mm tall 1556H enclosures (1556HBK, 1556HGY, 1556HWH) and the 70 mm tall 1556HA enclosures (1556HABK, 1556HAGY, 1556HAWH), all measuring 200 x 200 mm. It is sold separately from the enclosures.

The part page lists the size as 7.1 x 7.1 x 0.08 in (180 x 180 x 2 mm); the drawing shows 180.00 mm [7.09 in] square with a thickness of 2.05 mm [.08 in], R8.00 mm [R.31 in] corner radii and a 2.00 x 45.0 degree chamfer. Additional drawing dimensions of 170.00 mm [6.69 in], 155.00 mm [6.10 in] and 90.00 mm [3.54 in] locate its features. Shipping weight is 0.39 lbs (0.18 kg).

The 1556HPL is RoHS and REACH compliant and ships in shrink wrap. The drawing notes that parts can be factory modified (milling, drilling, printing etc.) and that solid models are available in .stp or .x_t for design work.