The 1557B2BK is a compact black polycarbonate enclosure from the 1557 water-tight series, sized 80 x 80 x 45 mm. It is built for engineers and integrators mounting small printed circuit boards, sensors and electronics in wet, dusty or outdoor locations where a sealed, listed housing is required.
External dimensions are 3.15 x 3.15 x 1.77 in (80 x 80 x 45 mm). The drawing shows inside dimensions of 71.30 mm [2.81 in] long, 71.02 mm [2.80 in] wide and 38.80 mm [1.53 in] high, and the maximum P.C. board size is 70.64 x 70.64 mm. Board bosses accept #6 self-tapping screws, and the 1557BPL aluminum inner panel is an available accessory.
The gasketed lid uses two piece tongue and groove construction with a one piece, high temperature UL listed silicone gasket, and closes with M4 stainless steel machine screws threaded into corrosion resistant inserts for repeated opening. The part carries IP68 and NEMA 4, 4X, 6, 6P, 12 and 13 ratings, is cUL and UL 508A listed under file E65324, and is UV stabilized for outdoor use. Polycarbonate versions carry an IK08 impact rating per IEC 62262:2021 and a recommended operating range of -40°C to +110°C (-40°F to +230°F); the part page lists a UL94 V-0 flame rating.
Each 1557B2BK includes the box, lid, 4 cover screws, preformed silicone gasket, 4 rubber feet, 2 wall mount feet and 2 wall mount foot screws, so it can be used on a tabletop, as a heavy duty flange wall mount or as a flush keyhole wall mount. Pole mount kits PMB5057WKIT1 (7" max) and PMB5057WKIT2 (15" max) are listed for the 1557B profile.
| Mounting Options | Desktop/tabletop (rubber feet); heavy duty wall flange mount (mounting feet outward); flush wall mount (mounting feet as keyhole slots) |
| Wall Mounting Screws | #8 pan head screws (not included) |
| Pole Mount Screw Type | #8 x 1/2" |
| Pole Mount Kit (7" Max) | PMB5057WKIT1 |
| Pole Mount Kit (15" Max) | PMB5057WKIT2 |
| Pole Mount Replacement Screw Pack | SCPMB4-20 |
| Wall Mount Foot Installation Torque | Polycarbonate 100-110 cN-m or 8.8-9.7 lbf-in |
| Type | Water-tight |
| Color | Black |
| Series | 1557 Series Type 4/4X, 6/6P Polycarbonate and ABS Plastic Enclosures (Water-Tight, Multiple Mounting Features) |
| Description | BLACK PC plastic watertight enclosure |
| Part Number | 1557B2BK |
| Enclosure Profile | 1557B |
| Short Description | PC NEMA WALL MNT ENCL BK |
| Width | 3.15 in (80 mm) |
| Length | 3.15 in (80 mm) |
| Inside Width | 71.02 mm [2.80 in] |
| Total Height | 1.77 in (45 mm) |
| Inside Height | 38.80 mm [1.53 in] |
| Inside Length | 71.30 mm [2.81 in] |
| Size (L X W X H) | 3.15 in x 3.15 in x 1.77 in (80 mm x 80 mm x 45 mm) |
| Max. P.C. Board Width | 70.64 mm |
| Max. P.C. Board Length | 70.64 mm |
| Same-Size Variants | 1557BBK (Black ABS), 1557BGY (Light Gray ABS), 1557B2BK (Black Polycarbonate), 1557B2GY (Light Gray Polycarbonate) |
| Aluminum Inner Panel | 1557BPL |
| Replacement Lid Screws | SC576-50 stainless steel, M4-0.7 x 20mm (Pkg 50) |
| Wall Mount Foot Screws | SC556-50 stainless steel, #8 x 3/8" self tapping (Pkg 50) |
| Replacement Rubber Feet | 1421T6CL (clear, Pkg 24) |
| P.C. Board Mounting Screws | SC526-50 steel, #6 x 1/4" self tapping (Pkg 50) |
| Replacement Gasket (2-Pack) | 1557BGASKET (silicone pre-formed, black) |
| Replacement Wall Mount Foot Kits (24-Pack) | 1557FOOT2BK-24 (Black Polycarbonate), 1557FOOT2GY-24 (Gray Polycarbonate) |
| UPC | 623980987484 |
| UNSPSC | 39121301 |
| Drawing Revision | REV: 13.02.2020 |
| Solid Models | .stp or .x_t |
| Factory Modification | Milling, drilling, printing etc. available from the factory |
| Included | Box, lid, 4 cover screws, preformed silicone gasket, 4 rubber feet, 2 wall mount foot screws and 2 wall mount feet |
| Packaging Type | Shrink wrap |
| Shipping Weight | 0.28 lbs (0.13 kg) |
| Gasket | One piece preformed gasket of high temperature UL listed silicone |
| Styling | Rounded corners and face |
| Material | Polycarbonate (UL listed) |
| Lid Screws | M4 stainless steel machine screws threaded into corrosion resistant M4-0.7 inserts/bushings |
| Lid Construction | Gasketed lid with two piece tongue and groove construction (protection against oil, dust and water) |
| PC Board Mounting | Bosses accept #6 self-tapping screws |
| Outer Wall Mount Option | Accepts #8 self-tapping screw |
| Recommended Cover Screw Torque | 71-85 ozf-in (50-60 cN-m) |
| IP Rating | IP68 (series: independently tested to meet IP66, IP67 and IP68) |
| NEMA Rating | 4, 4X, 6, 6P, 12 & 13 |
| Flame Rating | UL94 V-0 |
| Impact Rating | IK08 per IEC 62262:2021 |
| UV Resistance | UV stabilized for outdoor use |
| Chemical Resistance | Avoid acetone, ketones, ethers, aromatic and chlorinated hydrocarbons, thread locking compounds, cutting/tapping fluid, water detection paste, anti-seize paste, strong solvents or cleaners, and some greases and oils |
| Recommended Operating Temperature | -40°C to +110°C (-40°F to +230°F) |
| Material Flammability (Spec Sheet/Drawing) | UL94-5VA (drawing: UL94 - 5VA @ 3mm) |
| UL File # | E65324 |
| UL Listing | cUL and UL 508A listed (cULus Listed, Type 4, 4X, 6, 6P marking on drawing) |
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
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Yes. Polycarbonate versions of the 1557 series are UV stabilized for outdoor use, and this part is rated IP68 and NEMA 4, 4X, 6, 6P, 12 and 13.
Yes. Polycarbonate versions are cUL and UL 508A listed under file E65324.
The maximum P.C. board size is 70.64 x 70.64 mm. The drawing shows inside dimensions of 71.30 x 71.02 x 38.80 mm.
Yes. The assembly includes 2 wall mount feet and 2 wall mount foot screws, along with the box, lid, 4 cover screws, silicone gasket and 4 rubber feet. The #8 pan head screws used to fix it to a wall are not included.
The wall mount foot instructions specify 100-110 cN-m or 8.8-9.7 lbf-in for polycarbonate enclosures. Recommended cover screw torque is 71-85 ozf-in (50-60 cN-m).
The manufacturer advises against acetone, ketones, ethers, aromatic and chlorinated hydrocarbons, thread locking compounds, cutting or tapping fluid, water detection paste, anti-seize paste, strong solvents or cleaners, and some greases and oils.
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