Hammond RB-HFMS3 3U Single-Sided Horizontal Finger Cable Manager

The RB-HFMS3 is a 3U single-sided horizontal finger cable manager with a removable cover, designed for organized, high-density cable routing in standard 19-inch racks. It suits IT and network technicians, structured cabling installers, and AV integrators who need patch cables guided into defined pathways between switches and patch panels.

Construction is 16-gauge steel with polycarbonate fingers. The fingers are UL94V-0 rated for flame resistance, and the finger-style layout improves cable separation and routing control compared with open ring managers. The removable cover conceals cables for a clean, professional appearance and improved airflow management, and rear cutouts allow cable pass-through for added routing flexibility. The finish is black powder coat, described by the manufacturer as GREENGUARD, TSCA and RoHS compliant.

Overall dimensions for this part are 5.22 in (133 mm) high by 19.00 in (483 mm) wide with a 4.81 in (122 mm) overall depth, with the product list giving a nominal size of 5.25 in x 19 in x 4.5 in (133 mm x 483 mm x 114 mm). Usable mounting height is 5.25 in (133 mm) across 3 rack units, with a 19-inch mounting flange width of 18.32 in (465 mm). Inside dimensions measure 4.60 in (117 mm) and 4.12 in (105 mm), the top cable pass-through openings are 1.45 in (37 mm) and 2.74 in (70 mm), and the rear cable pass-through measures 5.00 in (127 mm) by 3.60 in (91 mm). Shipping weight is 2.9 lbs (1.32 kg).

RB-HFMS3 ships pre-assembled as a 3U back panel and 3U cover; mounting hardware is not included. It is designed for standard 19-inch EIA-compliant rack mounting and can be installed back-to-back for double-sided cable management in high-density applications. The part is TAA-compliant, USMCA compliant, RoHS and REACH compliant, and made in Canada.