Hammond H1SRR18U24BK 18U Square-Hole 19-Inch Rack Rail Pair

H1SRR18U24BK is an 18U pair of 19-inch mounting rails with EIA-310 square holes, designed as replacement or expansion rails for Hammond H1, HWF, RCK and NWC cabinets built on a 24.00 in (610 mm) overall cabinet width. It suits IT and telecom technicians, AV integrators, industrial OEM engineers and facilities teams who need to restore a damaged rail, add mounting positions, or convert a cabinet from threaded to square-hole mounting without replacing the enclosure.

The rails are manufactured from heavy-duty 12-gauge mild steel and finished in a textured black powder coat that is RoHS compliant and provides a durable, professional appearance. Silkscreened 1U markings run the full height of each rail to simplify equipment alignment, installation and future expansion. Square holes use typical EIA spacing at 0.38 in square, so standard cage nuts and square-hole rack hardware can be used throughout.

This 18U size provides 31.50 in (800 mm) of usable mounting height, with a drawing front-view rail height of 31.53 in (801 mm) and an overall depth/width footprint of 2.00 in (51 mm) by 1.39 in (35 mm) in top view. Two 0.44 x 0.75 in slots are provided for strut attachment, and all required strut mounting hardware is included. H1SRR18U24BK is sold as a matched pair for complete cabinet installation.

Supporting standard 19-inch rack equipment such as servers, switches, patch panels, UPS systems and AV components, the rails are made in Canada in an ISO 9001 certified facility, are TAA compliant and USMCA compliant, and are REACH and RoHS compliant with ECCN EAR99.