The 1551XFLBK is a black general purpose ABS plastic miniature enclosure with an integrated mounting flange molded into the lid. It measures 80 x 80 x 20 mm (3.15 x 3.15 x 0.79 in) excluding the flange, and is intended for OEM engineers and electronics builders who need to house a small printed circuit board or use the box as a potting shell, then fix it to a wall or panel, or suspend it with a tie wrap.

The 80 x 80 mm square footprint is the widest in the 1551 range, and at 20 mm deep including the lid it takes square boards up to 74 x 74 mm with room for taller parts. Inside, the box measures 76.00 x 76.00 mm [2.99 x 2.99 in], and the drawing gives a maximum PC board size of 74.04 x 74.04 mm [2.91 x 2.91 in]. PC board standoffs are molded into the interior and accept #2 self-tapping screws; the recommended board screw is #2 x 3/16", which is not included.

With the flange, overall length grows to 96.30 mm [3.79 in]. Flanged versions of the 1551 series are made in black or grey only, and this one is molded in black (RAL 9011). The lid closes with four #4 x 1/2" self-tapping screws, black plated to match the enclosure, with a recommended torque of 35-43 ozf.in (25-30 cN.m).

Walls are 2 mm (0.08") thick and the lap joint between box and lid protects against dust and splashing water; the enclosure is designed to meet IP54 and carries a UL94 HB flame rating. The 1551XFLBK is RoHS and REACH compliant, ships in a bag with the box, lid and 4 cover screws, and has a shipping weight of 0.1 lbs (0.05 kg). Some chemicals, such as acetone, thread-locking compounds and cutting fluid, can damage ABS, so check compatibility before use.