Hammond H1SRR45U31BK 45U Square-Hole Rack Rails for 31.5" Cabinets

The H1SRR45U31BK is a matched pair of 19-inch square-hole mounting rails sized for 31.50 in (800 mm) wide cabinets, giving 45U of usable mounting space. It is intended for IT, telecommunications, industrial and AV teams who need to replace damaged rails in an existing H1, HWF, RCK or NWC cabinet, add extra mounting positions, or convert a cabinet from threaded to square-hole mounting without replacing the enclosure.

The rails are formed from heavy-duty 12-gauge mild steel, providing a rigid platform for rack-mounted servers, switches, patch panels, UPS systems and industrial electronics. The textured black powder coat finish is RoHS compliant and gives a durable, professional appearance. Silkscreened 1U markings run the length of the rail to simplify equipment layout, alignment and future expansion.

Hole spacing follows EIA-310 standard square-hole pattern using 0.38 in square holes on typical EIA spacing, with a 1.62 in (41 mm) 1U pitch and an 18.35 in (466 mm) 19-inch mounting dimension. Overall rail height is 78.78 in (2001 mm), and the usable mounting height is 78.75 in (2000 mm) over 45 rack units. Four 0.44 x 0.75 in slots are provided for strut attachment, and all required strut mounting hardware is included so installation is straightforward.

H1SRR45U31BK ships as a pair with a shipping weight of 26 lbs (11.79 kg). The rails are manufactured in North America in an ISO 9001 certified facility, are TAA compliant and USMCA compliant, and are RoHS and REACH compliant. Because the pattern is EIA-310 based, the rails accept virtually any standard 19-inch rack hardware, making them suitable for cabinet refurbishment, custom configurations and restoring cabinets after equipment changes.