The 1550MBK is a black diecast aluminum enclosure from the 1550 Series, with a 120 x 100 mm footprint and a slim 31 mm body height. Its listed size is 4.74 in x 3.95 in x 1.23 in (120 mm x 100 mm x 31 mm). It is built for electronics designers, OEM engineers and builders who want a rugged, machinable metal case for instruments, control circuits or effects pedals, finished in black.
Inside, the drawing gives 115.28 x 95.28 mm [4.54 x 3.75 in] with 32.10 mm [1.26 in] of height, a flat cavity sized for a single low-profile board. The series ordering table lists this size as 4.72 in (120 mm) long, 3.94 in (100 mm) wide and 1.38 in (35 mm) high, a figure that includes the 4 mm (0.16 in) lid; the drawing shows 35.37 mm [1.39 in] overall with the lid fitted. Shipping weight is 0.49 lbs (0.22 kg).
The body is die-cast aluminum alloy painted with tough satin black polyester powder paint for a lasting finish, even after machining, and black screws are included to keep the assembled look consistent. Lap joint construction guards against dust and splashing water, and four M3.5 x 0.6 x 12 mm stainless steel Philips head machine screws secure the lid into factory tapped holes. There are no internal ribs, so connectors install without interference or extra milling, and the low side wall draft angle (2° less) eases PC board mounting.
As supplied, without a gasket, the 1550MBK is rated IP54. Adding the 1550MEGASKET EVA foam gasket kit brings it to IP66, and the 1550MSGASKET silicone kit is the IP67 upgrade (with properly installed gasket and lid screws torqued at 55 cN.m). The same size in natural aluminum is the 1550M, and the version shipped with an IP66 gasket is the 1550WMBK. It is RoHS and REACH compliant and ships in shrink wrap.
| Type | Die-cast box |
| Series | 1550 Series Diecast Aluminum Enclosures (Standard & Water-Tight Options) |
| Description | black diecast aluminum enclosure |
| Part Number | 1550MBK |
| Gasket Included | No (without gasket version) |
| Short Description | DIECAST BOX 1550 BLACK |
| Unpainted Equivalent | 1550M |
| Equivalent With IP66 Gasket Included | 1550WMBK |
| Lid Height | 4 mm (0.16 in) — add to enclosure depth for lid |
| Inside Height | 32.10 mm [1.26 in] |
| Inside Box Width | 95.28 mm [3.75 in] |
| Size (L X W X H) | 4.74 in x 3.95 in x 1.23 in (120 mm x 100 mm x 31 mm) |
| Inside Box Length | 115.28 mm [4.54 in] |
| Overall Width (Drawing) | 100.40 mm [3.95 in] |
| Overall Length (Drawing) | 120.40 mm [4.74 in] |
| Box Height Without Lid (Drawing) | 31.30 mm [1.23 in] |
| Overall Height With Lid (Drawing) | 35.37 mm [1.39 in] |
| Nominal Size Width (Ordering Table, Includes Lid) | 3.94 in (100 mm) |
| Nominal Size Height (Ordering Table, Includes Lid) | 1.38 in (35 mm) |
| Nominal Size Length (Ordering Table, Includes Lid) | 4.72 in (120 mm) |
| IP66 Gasket Kit (EVA Foam, Pair) | 1550MEGASKET |
| IP67 Gasket Kit (Silicone, Pair) | 1550MSGASKET |
| Driver Bit For Tamper-Proof Screws | SCDRIVET15-2 |
| Replacement Screws (Package Of 100) | 1550MS100BK |
| Tamper-Resistant Torx With Pin Screws (Package Of 50) | 1550MS50TBK |
| UPC | 623980403847 |
| UNSPSC | 39121301 |
| Packaging Type | shrink wrap |
| Shipping Weight | 0.49 lbs (0.22 kg) |
| Color | Black |
| Finish | Textured black powder coat — satin black polyester powder paint |
| Screws | Black screws included |
| Material | Aluminum (Die-Cast Alloy) |
| CAD Models | Solid models available in .stp or .x_t |
| Lid Screws | M3.5 x 0.6 x 12 mm long stainless steel, Philips head machine screws |
| Joint Construction | Lap joint (protection against dust and splashing water) |
| Lid Holes (Drawing) | 4X Ø4.02 mm [0.16 in] |
| Factory Modification | Milling, drilling, printing etc. available from the factory |
| Side Wall Draft Angle | Low (2° less) for easy PC board mounting |
| Lid Screw Holes In Box | 4X M3.5-0.6, factory tapped |
| IP Rating | IP54 |
| IP67 Upgrade | Available with silicone gasket kit |
| IP Rating With Gasket | IP66 (lid screws torqued at 55 cN.m) |
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
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The drawing gives an inside box length of 115.28 mm [4.54 in], inside width of 95.28 mm [3.75 in] and inside height of 32.10 mm [1.26 in]. The outside size is 4.74 in x 3.95 in x 1.23 in (120 mm x 100 mm x 31 mm).
Without a gasket it is rated IP54, with lap joint construction protecting against dust and splashing water. Fitting the 1550MEGASKET EVA foam gasket kit brings it to IP66, and the 1550MSGASKET silicone kit is tested to IP67, both with lid screws torqued at 55 cN.m.
No. The 1550MBK is the version without a gasket. The 1550WMBK is the equivalent supplied with an IP66 gasket, or you can add the 1550MEGASKET (IP66) or 1550MSGASKET (IP67) kit, each containing two pre-formed gaskets.
The part page lists a body height of 31 mm, while the series ordering table gives 1.38 in (35 mm) because its dimensions include the 4 mm (0.16 in) lid.
M3.5 x 0.6 x 12 mm long stainless steel Philips head machine screws thread into factory tapped holes. Black screws are included with this black version. Replacement screws are 1550MS100BK (package of 100); tamper-resistant Torx with pin screws are 1550MS50TBK (package of 50), driven with the SCDRIVET15-2 bit.
Yes. Diecast aluminum is tough yet easy to machine, and the satin black polyester powder paint is described as lasting even after machining. The factory also offers milling, drilling and printing.
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