Hammond 1550NBK 250×250×97 mm Black Diecast Aluminum Enclosure

The 1550NBK is a black diecast aluminum enclosure from the 1550 Series, with a square 250 x 250 mm footprint with a 97 mm body height. Its listed size is 9.85 in x 9.85 in x 3.82 in (250 mm x 250 mm x 97 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.

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 3.48 lbs (1.58 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 1550NBK 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 natural aluminum is the 1550N, and the version shipped with an IP66 gasket is the 1550WNBK. It is RoHS and REACH compliant and ships in shrink wrap.