Hammond 1550M 120×100×31 mm Natural Diecast Aluminum Enclosure

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.