Hammond 1551QTBU 40x40x15mm Translucent Blue ABS Miniature Enclosure

The 1551QTBU is the translucent blue member of the 40 x 40 x 15 mm 1551Q family. The see-through tinted ABS makes it a practical choice where a designer wants a small circuit, such as one with indicator LEDs, to be visible through the housing. It holds a PC board up to 34.5 x 34.5 mm and can also be used as a compact potting box.

The body is molded from general purpose ABS plastic with 2 mm (0.08 in) walls and carries a UL94 HB flame rating. Lap joint construction between box and lid protects against dust and splashing water, and the enclosure is designed to meet IP54. PC board mounting bosses are molded into the interior and accept #2 self-tapping screws.

Outside, the 1551QTBU measures 1.58 in x 1.58 in x 0.59 in (40 mm x 40 mm x 15 mm). Inside dimensions are 35.12 mm [1.38 in] long, 35.12 mm [1.38 in] wide and 11.00 mm [0.43 in] high. The maximum PC board size is 34.5 mm x 34.5 mm, and the shipping weight is 0.03 lbs (0.01 kg).

Each assembly includes the box, the lid and 2 self-tapping #4 x 1/2" cover screws, black plated to match the enclosure; the recommended torque is 35-43 ozf.in (25-30 cN.m). Screws for securing the PC board are not included; the drawing lists part 1551ATS100 (#2 x 3/16" self-tapping (4.8 mm), pack of 100). The part is RoHS and REACH compliant and ships in a bag.

Hammond notes that some chemicals can damage or weaken ABS, including acetone, ketones, thread-locking compounds and cutting or tapping fluids, so check compatibility before cleaning or modifying. The enclosure can be factory modified (milling, drilling, printing) and solid models are available in .stp or .x_t format.