Hammond 1550N 250×250×97 mm Natural Diecast Aluminum Enclosure

The 1550N is a natural-finish diecast aluminum enclosure from the 1550 Series, with a square 250 x 250 mm footprint with a 97 mm body height. The part page lists its size as 9.85 in x 9.85 in x 3.82 in (250 mm x 250 mm x 97 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 shows a square inside cavity of 240.30 x 240.30 mm [9.46 x 9.46 in] with 96.30 mm [3.79 in] of height, room for a large board together with its connectors and wiring. The series ordering table lists this size as 9.84 in (250 mm) long, 9.84 in (250 mm) wide and 3.98 in (101 mm) high, a figure that includes the 4 mm (0.16 in) lid; the drawing shows 101.30 mm [3.99 in] overall with the lid fitted. Shipping weight is 3.43 lbs (1.56 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 1550N is rated IP54. Adding the 1550NEGASKET EVA foam gasket kit brings it to IP66, and the 1550NSGASKET 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 1550NBK, and the version shipped with an IP66 gasket is the 1550WN. It is RoHS and REACH compliant and ships in shrink wrap.