12' Double-Sided Cantilever Rack Add-On Unit

Double-Sided Cantilever Rack Add-On Unit — 12' High, 48" Arms, 11,704 lb per Side

Who it's for: Warehouses already running a double-sided cantilever row that need to extend it. This Space Plus USA add-on unit adds one column 12' tall and 48" arms rated 3,960 lb each on both sides, sharing columns with adjacent units to eliminate redundant uprights.

Best for: extending an existing double-sided cantilever rack row, forklift or crane loading from either side, indoor or outdoor storage.
Not the best fit for: starting a new row — you need a 12' double-sided starter unit first. For single-side access, the 12' single-sided add-on unit costs less. Need a different height? See the 16' Double-Sided Cantilever Rack Add-On Unit.

What makes it different

• Load from both aisles: arms on both sides of every column give two full storage faces, doubling throughput for high-volume operations without taking more floor space.
• Arms adjust every 4": arms lock into the column at 4" intervals the full height of the upright, without tools, to match your load sizes on each side independently.
• Indoor or outdoor: impact-resistant powder-coated steel, with a galvanized finish available on request, engineered to RMI specifications.

Key specs at a glance: Column height 12' (144") | Arm length 48" | Arm capacity 3,960 lb each | Column capacity 11,704 lb per side | Double base | Arm adjustment every 4"

Need to start a new row? See the 12' Double-Sided Cantilever Rack Starter Unit →

Ships complete with 1 column, arms on both sides, and brace sets. Each add-on shares one column with the adjacent unit. Each base requires 4 standard anchor bolts to secure to the floor (not included). Outdoor-ready with a durable powder-coated finish. A galvanized finish is available upon request for added protection.

What's Included

• 1 column (5" x 10" H-profile, blue powder coat)
• Cantilever arms on both sides (48" length, 3,960 lb capacity each, orange powder coat)
• Brace sets per column height (blue powder coat)
• Double base hardware kit
• All hardware for assembly

Why the 12' Double-Sided Add-On Unit

Load from both aisles — Arms run on both sides of each column, so your team can pick and replenish simultaneously from either aisle. Ideal for high-throughput lumberyards, steel service centers, and pipe distributors.

Fully adjustable arms — Arms lock into the column at 4" intervals the full height of the upright, letting you customize each level and each side to exactly match your load dimensions without any tools.

Tool-free pipe stop end installation — Optional pipe stop ends (sold separately) drop into place with no tools required, preventing cylindrical loads from rolling off the end of the arm.

Outdoor-ready, maintenance-free construction — Impact-resistant powder-coated steel stands up to demanding indoor and outdoor environments. Galvanized finish available on request for maximum corrosion protection.

Grows with your operation — Each add-on shares a column with the adjacent unit. Start your row with the 12' Double-Sided Cantilever Rack Starter Unit and add as many add-ons as your space allows.

Engineered to RMI specifications — Seismic analysis, stamped drawings, and engineering calculations available upon request.

Not sure which rack you need? Read our cantilever rack buying guide for help with arm length, capacity, upright spacing and height.

Questions before ordering? Call (929) 577-4339 or email support@mywarehouseworld.com.

Floor Anchors (Required, Not Included): Each base must be secured to the floor with 4 standard anchor bolts before use. Anchors are not included and must be sourced independently. Building codes vary by location — consult local codes for specific requirements.

12' Double-Sided Add-On Unit — Configuration Comparison

Need a 16' unit? See the 16' Double-Sided Cantilever Rack Add-On Unit.

Specifications

Important: Capacities are based on evenly distributed loads. Load must be kept centered and must not exceed arm length. Unit must be anchored to the floor before use.

FAQ

How much weight can the double-sided unit hold?

Each 48" arm is rated 3,960 lb (evenly distributed load), and the column capacity is 11,704 lb per side based on the 48" arm length. Keep loads centered and no longer than the arm. Each side is independent — both sides can be loaded simultaneously to their full per-side capacity.

What is the difference between the 48" and 60" column spacing options?

Both options use 48" arms and the same 11,704 lb per side capacity. Column spacing is the distance between columns. Choose wider spacing for longer materials that need more horizontal clearance between uprights. See our cantilever rack buying guide for guidance on matching spacing to your material lengths.

What is the difference between a double-sided and a single-sided unit?

A double-sided unit has arms on both sides of every column, letting you store and access loads from two aisles. A 12' single-sided unit has arms on one side only and costs less. Use double-sided when you need two-aisle access or want to maximize storage per linear foot of floor space.

What comes in the box?

1 column, cantilever arms on both sides, brace sets and all hardware.

Can the arms be adjusted?

Yes. Arms lock into the column every 4" the full height of the upright, with no tools needed. Each side can be configured independently.

Can it be used outdoors?

Yes. The powder-coated finish is corrosion-resistant and built for indoor and outdoor use. A galvanized finish is available on request for more protection in outdoor or high-humidity areas.

Are floor anchors included?

No. Each base needs 4 standard anchor bolts to secure it to the floor before use. Anchors can be bought locally or provided by us at additional cost. Check local building codes for requirements.

Can I stop pipe from rolling off the arms?

Yes. Tool-free pipe stop ends drop onto the arms to keep cylindrical loads from rolling off. They are sold separately.

How do I extend the row?

Yes. Each add-on shares a column with the adjacent unit. Start with the 12' double-sided starter unit and add as many add-ons as your row requires.

Are engineering drawings available?

Yes. The rack is engineered to RMI specifications, and stamped drawings, seismic analysis and engineering calculations are available on request.

How is the 12' double-sided cantilever rack delivered, and what does freight cost?

It ships by freight truck from Space Plus USA in Spartanburg, SC, as curbside delivery. Freight is not included in the order total: we confirm your freight rate within 1 business day of your order and send a separate freight invoice for approval. Most orders ship within 3–10 business days of freight payment. It weighs approximately 423 to 433 lb, so have a forklift or pallet jack ready to unload, or ask us to add liftgate delivery. You can also use your own freight carrier at no extra cost.

Is My Warehouse World an authorized Space Plus USA dealer?

Yes. We're an authorized Space Plus USA dealer. Your order is placed directly with Space Plus USA and ships from their facility in Spartanburg, SC.

Customization Options

Contact us to discuss any of the following:

Pipe Stop Ends — Tool-free pipe stop ends can be added to any arm to prevent cylindrical loads from rolling off the end. Sold separately.

36" and 60" Arms — Available made to order. Contact us for lead time and pricing.

Galvanized Finish — Available on request for enhanced corrosion resistance, ideal for outdoor or high-humidity environments.

Custom Arm Capacities and Profiles — Space Plus USA can engineer arm capacities and profiles to meet specific load requirements.

Seismic and Engineering Drawings — Stamped drawings, seismic analysis, and engineering calculations available upon request.

Custom Colors — Available at additional cost.

To discuss customization options, call (929) 577-4339 or email support@mywarehouseworld.com.

Shipping & Returns

Delivery, Lead Time & Warranty

Shipping Policy

This product ships via freight carrier from Spartanburg, SC. Need liftgate delivery? Tell us when you request your freight quote and we'll add it.

Freight is not included in your order total. After placing your order, a member of our team will contact you within 1 business day to confirm your freight rate. A separate freight invoice will be sent for your approval before your order ships. Your order will not ship until freight is confirmed and paid.

Most orders ship within 3–10 business days of freight payment. Tracking provided via email once your order ships.

Return Policy

To initiate a return, contact us at support@mywarehouseworld.com or (929) 577-4339 within 30 days of delivery.