The 1591EF2BK is the 1591E size flame retardant ABS enclosure in black, supplied with an accessory flange attached to the bottom. The series table lists it at 190 x 111 x 61 mm (7.48 x 4.37 x 2.40 in); the part page gives 7.5 x 4.35 x 2.39 in (191 x 110 x 61 mm). It is built for engineers and installers who need a larger PCB housing that bolts directly to a wall, cabinet back or machine frame.

The FRABS body carries a UL94 V-0 rating. Six M3-0.5 x 10 mm Phillips machine screws, black to match the enclosure, thread into pre-installed brass inserts, supporting repeated assembly and disassembly at a recommended 35.5-42.5 ozf.in (25-30 cN.m). Lap joint construction protects against dust and splashing water; the design meets IP54.

With the bottom flange, the drawing shows an overall length of 220.00 mm (8.661 in). Inside dimensions are 183.52 x 103.53 x 56.60 mm (7.225 x 4.076 x 2.228 in), and card guides in all side walls hold 1.5 mm (0.062") boards vertically.

The 1591EF2BK weighs 0.64 lbs (0.29 kg), ships shrink wrapped with box, lid, 6 cover screws and brass inserts, and is RoHS and REACH compliant. Its gray twin is 1591EF2GY, and the 1591EC clear lid is listed for this size.