The 1590STPC is the octagon enclosure from the 1590TRP-STP series of octagon and trapezoid diecast aluminum enclosures, supplied in an unpainted natural finish that is vibra finished for a smooth surface with no sharp edges. Stomp box use is the series' most popular application, so it suits guitar effects pedal builders as well as OEM engineers and experimenters who want an unusual shape for a unique look.

The octagon's eight-sided outline measures 133 mm in both length and large-end width, with 57 mm at the small end. Box and lid are diecast aluminum alloy, a rugged material that is tough yet easy to machine.

The standard version ordering table lists 5.24 in (133 mm) length, 2.24 in (57 mm) width at the small end, 5.24 in (133 mm) width at the large end and 1.54 in (39 mm) depth; the part page gives 5.23 in x 5.23 in x 1.38 in (133 mm x 133 mm x 35 mm). The drawing shows 126.58 x 126.58 mm inside, with 34.95 mm [1.376 in] inside height. Maximum PC board size is 125.58 x 125.58 mm, and the side wall draft angle of 2° or less makes board mounting easy.

Lap joint construction protects against dust and splashing water and the enclosure is designed to meet IP54. Four #6-32 x 1/2" machine screws secure the lid into factory-tapped holes (recommended torque 50-55 cN.m [71-78 ozf.in]); the assembly ships as box, lid and 4 cover screws, shrink wrapped, at 0.6 lbs (0.27 kg). It is RoHS and REACH compliant. The black counterpart is 1590STPCBK, and the watertight version with gasket is 1590WSTPC.