The 1550H is a natural-finish diecast aluminum enclosure from the 1550 Series, with a 222 x 146 mm footprint with a 101 mm body height, the deep version of the 222 x 146 mm size (the 1550G is the 51 mm version). The part page lists its size as 8.74 in x 5.75 in x 3.98 in (222 mm x 146 mm x 101 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.

The drawing gives an inside cavity of 212.84 x 136.84 mm [8.38 x 5.39 in] with 101.10 mm [3.98 in] of height, enough depth for tall components or stacked boards within a 222 x 146 mm footprint. The series ordering table lists this size as 8.74 in (222 mm) long, 5.75 in (146 mm) wide and 4.13 in (105 mm) high, a figure that includes the 4 mm (0.16 in) lid; the drawing shows 105.10 mm [4.14 in] overall with the lid fitted. Shipping weight is 1.81 lbs (0.82 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 1550H is rated IP54. Adding the 1550GEGASKET EVA foam gasket kit brings it to IP66, and the 1550GSGASKET 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 1550HBK, and the version shipped with an IP66 gasket is the 1550WH. It is RoHS and REACH compliant and ships in shrink wrap.