The 431610 is a black anodized extruded aluminum enclosure from the Sink Box series, a British designed enclosure originally sold under the West Hyde Enclosures Ltd. name. It is ideally suited for mounting small printed circuit boards or chassis horizontally, and the finned top acts as a heat sink. This is the 200 mm long version for 85 mm wide P.C. boards, the longest size in the series table; 431609 is the 100 mm version of the same cross-section.

The body is formed from a single, hollow aluminum extrusion, which gives the unit high strength and simplifies assembly, with aluminum end panels attached to each end. Inside, numerous slots on both shorter sides accept a P.C. board or chassis (the drawing notes this size is for 85 mm wide PCBs), and three "T" slots, one in the top taking an M3 half-nut and two in the bottom taking M4 half-nuts, offer an alternative way to mount chassis or components that need to be cooled by conduction.

The nominal size is 7.87 in x 3.54 in x 2.01 in (200 mm x 90 mm x 51 mm). The drawing gives an extrusion width of 89.70 mm [3.531 in], height of 50.50 mm [1.988 in] and length of 200.00 mm [7.874 in]. The two bottom exterior "T" slots take M4 half-nuts and allow mounting of wall brackets, belt attachment or connection to another enclosure. The part carries an IP54 rating.

The purchased assembly includes the extrusion, 2 end plates, 2 molded black plastic bezels that protect the end panels, and 8 screws (#4 x 1/2 pan head), with a recommended cover screw torque of 2.5-3.5 lbf-in (30-40 cN-m). The drawing notes that enclosures can be factory modified (milling, drilling, printing) and that solid models are available in STEP or IGES. The 431610 is RoHS and REACH compliant, ships shrink wrapped at 1.06 lbs (0.48 kg), and the manufacturer notes the Sink Box line will soon be discontinued as a stocked series and is available while quantities last.