The 1550M is a natural-finish diecast aluminum enclosure from the 1550 Series, with a 120 x 100 mm footprint and a slim 31 mm body height. The part page lists its size as 4.74 in x 3.95 in x 1.23 in (120 mm x 100 mm x 31 mm). It suits electronics designers, OEM engineers and hobby builders who need a rugged, easy-to-machine metal box for instruments, control circuits or stomp-box style projects.
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).
Die-cast aluminum alloy is tough yet easy to machine, and the unpainted body is vibra finished for a smooth surface with no sharp edges. Lap joint construction protects against dust and splashing water. Four M3.5 x 0.6 x 12 mm stainless steel Philips head machine screws hold the lid in factory tapped holes. Smooth, rib-free internal walls make fitting connectors straightforward, and a low side wall draft angle (2° less) helps with PC board mounting.
As supplied, without a gasket, the 1550M 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 black powder coat is the 1550MBK, and the version shipped with an IP66 gasket is the 1550WM. 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 | diecast aluminum enclosure |
| Part Number | 1550M |
| Gasket Included | No (without gasket version) |
| Black Equivalent | 1550MBK |
| Short Description | DIECAST BOX 1550 SERIES |
| Equivalent With IP66 Gasket Included | 1550WM |
| 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) | 1550MS100 |
| Tamper-Resistant Torx With Pin Screws (Package Of 50) | 1550MS50T |
| UPC | 623980057668 |
| UNSPSC | 39121301 |
| Packaging Type | shrink wrap |
| Shipping Weight | 0.49 lbs (0.22 kg) |
| Color | Natural Aluminum |
| Finish | Natural vibra finish (unpainted, smooth surface with no sharp edges) |
| 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 1550M is the version without a gasket. The 1550WM 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. Replacement screws are 1550MS100 (package of 100); tamper-resistant Torx with pin screws are 1550MS50T (package of 50), driven with the SCDRIVET15-2 bit.
Yes. Diecast aluminum is tough yet easy to machine, and there are no internal ribs to interfere with connectors. The factory also offers milling, drilling and printing modifications.
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