The 1591CBU is the blue version of the 1591C flame retardant ABS enclosure. It measures 4.72 in x 2.56 in x 1.57 in (120 mm x 65 mm x 40 mm) and is listed on the 1591C drawing as FR ABS UL94 -V0 in blue, giving product designers a distinctive color option for a compact electronics housing.

Card guides molded into all side walls accept 1.5 mm (0.062”) thick boards, so circuit boards stand vertically. The drawing shows an interior of 113.53 mm x 58.53 mm x 35.90 mm and a guide height of 30.91 mm.

The lid accepts M3 - 0.5 machine screws, and the purchased assembly includes box, lid, 4 cover screws and pre-installed brass inserts. The drawing revision supplied with this part (REV: 07.01.2020) gives a recommended torque of 42-57 ozf.in (30-40 cN.m). Replacement plated cover screws are listed as 1591MS100 (Silver) and 1591MS100BK (Black).

Lap joint construction and an IP54 rating protect against dust and splashing water, and the easy-to-machine ABS can be drilled or cut for connectors and switches. The 1591CBU is RoHS and REACH compliant, ships in shrink wrap and weighs 0.19 lbs (0.09 kg).