The 1551SNAP11BK is a compact round enclosure in black ABS plastic, the smallest circle size in the unvented 1551SNAP range. At a 45 mm diameter and 20 mm depth, it takes a PC board up to 39 x 39 mm and suits small IoT and sensor devices where a discreet round housing is preferred.
The housing carries a UL94 HB flame rating and is designed to meet IP30. Its base and cover snap together without hardware and can be reopened repeatedly.
Overall size is listed as 1.77 in x 1.77 in x 0.79 in (45 mm x 45 mm x 20 mm), with a drawing height of 20.30 mm [.80 in] for the assembled enclosure. Four PC board standoffs are molded into the interior and accept #2 self tapping screws; Hammond recommends #2 x 3/16" self tapping screws, sold separately as 1553WTS100 (pack of 100), tightened to a recommended torque of (21-28) ozf.in / (15-20) cN.m. Shipping weight is 0.03 lbs (0.01 kg).
The part is RoHS and REACH compliant. The same size is also offered as the vented 1551V11BK. Hammond notes that some chemicals, including acetone, ketones, thread locking compounds and cutting fluids, can damage ABS plastic, so check compatibility before cleaning or modifying the enclosure.
| Type | Miniature, sensor |
| Shape | Round |
| Series | 1551SNAP (ABS plastic miniature enclosures, snap-fit, wall-mount) |
| Version | Unvented |
| Description | SNAP ENCL ROUND x 45 ABS BLACK |
| Part Number | 1551SNAP11BK |
| Vented Equivalent | 1551V11BK |
| Depth | 0.79 in (20 mm) |
| Diameter | 1.77 in (45 mm) |
| Size (L X W X H) | 1.77 in x 1.77 in x 0.79 in (45 mm x 45 mm x 20 mm) |
| Max. P.C. Board Width | 39 mm |
| Max. P.C. Board Length | 39 mm |
| Overall Height (Drawing) | 20.30 mm [.80 in] |
| UPC | 623980102993 |
| UNSPSC | 39121301 |
| Drawing Revision | 31.08.2023 |
| Assembly | Snap-fit base and cover; no hardware required; can be reopened repeatedly |
| Included | Snap together base and cover |
| PC Board | Not supplied |
| Wire Entry | Knockout on base, removable with a screwdriver |
| Wall Mounting | Slots on the base |
| PC Board Standoffs | (4) molded into interior; accept #2 self tapping screw |
| Recommended Torque | (21-28) ozf.in / (15-20) cN.m |
| Recommended PCB Screw | #2 x 3/16" (4.8 mm) self tapping, not included (1553WTS100, pack of 100) |
| Shipping Weight | 0.03 lbs (0.01 kg) |
| Color | Black |
| Material | ABS Plastic (general purpose) |
| CAD Models | .stp or .x_t |
| Chemical Resistance | Avoid acetone, ketones, ethers, aromatic and chlorinated hydrocarbons, thread locking compounds, cutting/tapping fluid, water detection and anti-seize paste, strong solvents, and some greases and oils |
| Factory Modification | Milling, drilling, printing available from the factory |
| IP Rating | IP30 |
| Flame Rating | UL94 HB |
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
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The maximum PC board size is 39 mm long by 39 mm wide. The board is not supplied; it mounts on (4) standoffs molded into the interior.
No. Use #2 x 3/16" self tapping screws, available as part number 1553WTS100 (pack of 100). The recommended torque is (21-28) ozf.in / (15-20) cN.m.
Yes. The vented equivalent in the same size and colour is 1551V11BK, intended for sensors and other applications that need air and moisture exposure.
The base has wall-mounting slots, and a knockout on the base can be removed with a screwdriver for wire entry.
No. The base and cover snap together with no hardware required, and the enclosure can be reopened repeatedly as needed.
It is designed to meet IP30, and the ABS plastic carries a UL94 HB flame rating. The part is also RoHS and REACH compliant.
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