H1SRR42U30BK is a pair of 42U 19-inch panel rails with 0.38 square mounting holes on typical EIA spacing, intended as a field replacement or alternative rail set for 42U cabinets in the HWF wall and floor mount rack cabinet range. It suits IT and telecom installers who prefer cage-nut style square hole mounting over 10-32 tapped rails for network switches, servers and patch panels.

The rails are formed from mild steel and painted thin film black. Each rail carries silkscreened U markings so equipment positions can be identified quickly during installation and later service visits. The set is sold as a pair, with 4X 0.44 x 0.75 slots for adjustment in the cabinet.

Key drawing dimensions include a 42U mounting length of 73.53 in (1868 mm), an overall front view height of 71.94 in (1827 mm) and a 19-inch mounting width of 18.35 in (466 mm), with 1U spacing of 1.62 in (41 mm). Cross dimensions of 24.00 in (610 mm) and 23.94 in (608 mm) are shown, along with rail profile dimensions of 4.39 in (112 mm), 2.00 in (51 mm), 3.64 in (92 mm) and 5.41 in (137 mm). Shipping weight is 22 lbs (9.98 kg).

Within the HWF series accessory table, H1SRR42U30BK is listed for 42U cabinet height, alongside the threaded 10-32 equivalent H1TRR42U30BK and compatible vertical management items VCT73, VCTPDU73 and H1VFMC3042UBK. The part is cULus recognized under UL file E475597, TAA-compliant, RoHS and REACH compliant, USMCA compliant, and made in Canada.