The 1550Z139BK is the black textured edition of the 1550Z139 deep square watertight diecast aluminum enclosure. The part page lists 6.28 in x 6.28 in x 4.02 in (160 mm x 160 mm x 102 mm) and the ordering table 6.26 in (159 mm) square with 4.02 in (102 mm) total depth. It serves engineers and installers who want a large sealed metal housing with a finished black exterior.

A tough polyester powder coat is applied outside and inside, and it is described as a lasting finish even after machining. The drawing gives inside dimensions of 149.86 mm [5.90 in] square by 97.00 mm [3.82 in] deep, and the part data allows P.C. boards up to 148.71 mm x 148.71 mm. The walls have no internal ribs.

The 0.83 in (21 mm) lid is held by four stainless steel Philips head M4 - 0.7 screws that are self-captivating: the lid holes are slightly undersized and threaded with the first installation. The screws sit outside the silicone gasket, which is rated -40°C to +150°C (-40°F to 302°F). Recommended torque is 5-7.5 lbf.in (50-75 cN.m). Blind thru-box holes support wall mounting outside the gasket ring, and a #6 self tapping ground screw fits inside.

The 1550Z139BK is rated IP68, NEMA 4, 4X, 12 & 13 and IK08 per IEC62262, is cUL and UL listed under file #E71073, and is RoHS and REACH compliant. It ships shrink wrapped at 2.36 lbs (1.07 kg) with box, lid, gasket and 4 cover screws.