Hammond 1551SNAP1BK 40x40mm Black Unvented Snap-Fit Sensor Enclosure

The 1551SNAP1BK is a 40 x 40 mm square unvented miniature enclosure from the 1551SNAP series, molded in black ABS plastic. Its snap-fit assembly and wall-mounting features are designed for IoT or general purpose applications, and it is well suited to mounting printed circuit boards for sensor nodes and small electronics. If airflow is needed, the matching vented version is 1551V1BK.

The part page lists a size of 1.57 in x 1.57 in x 0.79 in (40 mm x 40 mm x 20 mm); the drawing shows 40.00 mm [1.57 in] by 40.00 mm [1.57 in] with an overall height of 20.30 mm [0.80 in]. The maximum P.C. board size is 34 mm x 34 mm, and four PC board standoffs are molded into the interior. Boards are secured with #2 x 3/16" self-tapping screws, which are not included; 1553WTS100 is a pack of 100, and the recommended torque is 21-28 ozf.in (15-20 cN.m).

The base and cover snap together with no hardware required, and the enclosure can be reopened repeatedly as needed. Assembly hooks, wall-mounting slots on the base and a wire entry knockout that can be removed with a screwdriver make installation straightforward. The black finish is one of the three stocked colours, alongside grey and white.

The 1551SNAP1BK is designed to meet IP30, the ABS material carries a UL94-HB rating, and it is RoHS and REACH compliant. Shipping weight is 0.03 lbs (0.01 kg). Some chemicals can damage or weaken ABS, including acetone, thread-locking compounds and cutting fluids, so confirm compatibility first. Factory modification (milling, drilling, printing) is available, and solid models are offered in .stp or .x_t.