Middle Atlantic RRF21 PAIR 21SP (36.75") RACK RAIL

Product Overview

The Middle Atlantic RRF21 is a pair of 21-space (36.75-inch) threaded rack rails for 19-inch rack installations. Constructed from 1/8-inch thick steel with a durable black e-coat finish, these rails are threaded for 10-32 screws and follow EIA standard spacing. They are designed for use with 19-1/8-inch wide rough openings and provide the foundational mounting infrastructure for building open-frame or custom rack systems.

Product Description

The RRF21 Rack Rail pair from Middle Atlantic Products provides two 21-space steel rack rails measuring 36.75 inches in length for constructing 19-inch wide rack systems. The 10-32 threaded holes follow EIA standard spacing, ensuring compatibility with the full range of standard rack-mount equipment. The 1/8-inch thick steel construction provides the structural rigidity needed to support the weight of fully populated rack equipment while maintaining precise hole alignment across the full 21-space height. The black e-coat finish provides corrosion resistance appropriate for typical rack room environments. These rails are designed for 19-1/8-inch rough opening widths, making them the correct specification for standard rack enclosure and open-frame rack applications. RRF Series rails are sold as pairs, providing the left and right rail components required for one rack system. The RRF21 is appropriate for builds where 21U of rack capacity is the target height, or where replacing worn or damaged rails in an existing 21U rack is required.

Key Features

• 21U / 21SP Rack Capacity — 36.75-inch length provides 21 rack spaces.
• 10-32 Threaded — Standard 10-32 thread spacing for full EIA-compatible equipment mounting.
• 1/8-Inch Steel Construction — Heavy-duty thickness for structural rigidity.
• Black E-Coat Finish — Corrosion-resistant finish for long-term durability.
• Sold as Pair — Includes both left and right rails.

Technical Specifications