Pallet Rack Row Spacers: Purpose, Placement, and Installation Guide
Pallet rack row spacers are components used to connect and maintain the spacing between back-to-back pallet rack upright frames. They help keep two rack rows aligned, maintain the designed gap between frames, and contribute to the overall stability of the rack configuration.
Although a row spacer is a relatively small component, its length, position, quantity, and connection method should match the rack manufacturer's engineering design. It should not be selected only by appearance or by using a standard size without checking the actual rack configuration.
What Is a Pallet Rack Row Spacer?
A pallet rack row spacer is a structural connection installed between two upright frames arranged back-to-back.
In a back-to-back pallet rack layout, two rack rows are positioned with their rear sides facing each other. The row spacer connects the corresponding upright frames and helps maintain a consistent distance between the two rows.
The basic functions of a row spacer include:
- Connecting back-to-back pallet rack upright frames.
- Maintaining a consistent gap between rack rows.
- Helping keep the two rows properly aligned.
- Supporting the stability of the back-to-back rack configuration.
- Helping maintain the designed rear clearance or flue space where required.
The exact structural role of a row spacer depends on the rack design, frame geometry, building conditions, and applicable engineering requirements.
Why Are Row Spacers Used in Back-to-Back Pallet Racking?
When pallet racks are installed back-to-back, maintaining the correct relationship between the two rows is important for the overall rack layout.
Without an appropriate connection between the frames, the distance between the two rows may not remain consistent during installation and operation. A properly designed row spacer provides a defined connection between the upright frames.
For this reason, row spacers are particularly relevant in:
- Back-to-back selective pallet racking.
- High-density pallet storage layouts.
- Long runs of back-to-back rack.
- Drive-in and drive-through rack configurations where specified by the design.
- Warehouse layouts requiring consistent rear spacing between rack rows.
How Does a Pallet Rack Row Spacer Work?
A row spacer is normally bolted between corresponding upright frames. Its length establishes the designed distance between the rear faces of the two rack rows.
For example, if two rack rows are designed with a specific rear gap, the spacer must be selected to match that configuration. The correct dimension is therefore determined by the rack engineering drawings and the required clearance, rather than by choosing the longest or shortest available spacer.
Once installed correctly, the spacer helps maintain the relationship between the two upright frames as part of the complete rack structure.
Where Are Pallet Rack Row Spacers Installed?
Row spacers are installed between the upright frames of two back-to-back rack rows. Their exact vertical locations depend on the rack height, frame configuration, bracing arrangement, and manufacturer's engineering requirements.
When planning spacer locations, the installation should avoid interference with:
- Horizontal beams.
- Vertical frame bracing.
- Pallet loads.
- Forklift operating clearance.
- Other rack accessories.
- Fire protection components where applicable.
The spacer should connect suitable structural points on the upright frame rather than being installed at an arbitrary height.
How Many Row Spacers Does a Pallet Rack Need?
There is no single universal number of row spacers that applies to every pallet rack.
The required quantity can depend on factors such as:
- Upright frame height.
- Frame depth.
- Rack configuration.
- Back-to-back spacing.
- Frame bracing arrangement.
- Building and seismic conditions.
- Applicable engineering requirements.
- Manufacturer specifications.
Taller rack frames may require additional spacer locations compared with shorter frames. The correct quantity should therefore be confirmed from the rack design rather than estimated from the rack appearance.
How to Choose the Correct Row Spacer Length
The most important consideration when selecting a row spacer is the required distance between the two rack rows.
A practical selection process is:
- Confirm the rack frame dimensions. Measure or verify the upright frame depth and configuration.
- Determine the required back-to-back gap. Consider pallet overhang, rear clearance, building conditions, and the rack design.
- Check the engineering drawing. Use the manufacturer's specified row spacing rather than assuming a standard dimension.
- Confirm compatibility. The spacer connection must match the upright profile and connection holes.
- Check interference. Make sure the spacer does not interfere with beams, bracing, pallets, or other components.
- Verify the installation quantity. Use the quantity and vertical locations specified for the particular rack configuration.
For customized warehouse projects, the rack manufacturer should confirm the required spacer dimensions before fabrication.
Row Spacer and Flue Space
The space between back-to-back rack rows can have an important role in warehouse layout and fire protection planning. In some applications, the rear space between racks forms part of the required flue space.
However, the required flue space is not a universal fixed dimension. It can depend on the storage arrangement, commodity, building fire protection system, sprinkler design, rack configuration, and applicable local requirements.
For this reason, a row spacer should not be selected by simply assuming that one particular spacer length is suitable for every warehouse.
If fire protection requirements are involved, the rack layout should be coordinated with the warehouse's fire protection design and applicable regulations.
Row Spacer vs. Wall Tie
Row spacers and wall ties may look similar because both connect rack structures to another structural reference point, but they serve different layout conditions.
| Component | Typical Application | Main Purpose |
|---|---|---|
| Row Spacer | Back-to-back rack rows | Connects two rack rows and maintains the designed rear spacing |
| Wall Tie | Rack positioned along a building wall | Maintains the required distance between the rack and wall where specified |
The correct component depends on the warehouse layout and rack configuration. A wall tie should not be substituted for a row spacer unless the rack design specifically allows it.
What Happens If Row Spacers Are Installed Incorrectly?
Incorrect spacer selection or installation can affect the rack layout and may create problems during installation or operation.
Potential issues include:
- Uneven spacing between back-to-back rack rows.
- Rack frames that are not properly aligned.
- Interference with frame bracing.
- Insufficient rear clearance for the intended rack configuration.
- Connection hardware that does not properly fit the upright.
- Difficulty maintaining consistent rack geometry across a long row.
A row spacer should therefore be treated as part of the engineered rack system rather than as a simple optional piece of hardware.
How to Install Pallet Rack Row Spacers
The installation procedure depends on the rack design and connection type, but a typical installation process includes the following steps:
- Position the rack frames. Place the two back-to-back rack rows according to the approved layout.
- Verify the rear spacing. Confirm the distance between corresponding upright frames.
- Identify the specified connection points. Use the locations shown on the rack engineering drawings.
- Position the row spacer. Align the spacer with the appropriate holes on both upright frames.
- Install the connection hardware. Insert the specified bolts, nuts, and washers.
- Check alignment. Confirm that both rack rows remain straight and evenly spaced.
- Complete the final inspection. Verify all required spacer connections and hardware before the rack is placed into service.
Installation should follow the rack manufacturer's instructions. Hardware should not be replaced with unapproved fasteners simply because they appear to fit.
Common Row Spacer Installation Mistakes
Using the Wrong Spacer Length
A spacer that is too short or too long may create an incorrect gap between the rack rows. Spacer length should match the engineered rack layout.
Installing Spacers at Arbitrary Locations
Spacer locations should be coordinated with the upright bracing and rack design. Installing a spacer where it interferes with a structural member can create an installation problem.
Using Incompatible Hardware
The connection hardware should match the rack manufacturer's specifications and the upright connection design.
Ignoring Changes to the Rack Layout
If rack height, frame depth, pallet dimensions, or storage configuration changes, the existing spacer arrangement may need to be reviewed.
Mixing Components From Different Rack Systems
Different rack manufacturers and upright profiles may use different connection geometries. A spacer that fits one rack system should not automatically be assumed to be compatible with another.
How Row Spacers Affect Warehouse Rack Layout
Row spacers should be considered during the initial warehouse layout rather than added after the rack rows have already been positioned.
The rack design should coordinate:
- Rack frame depth.
- Back-to-back spacing.
- Pallet dimensions.
- Pallet overhang.
- Aisle width.
- Forklift clearance.
- Building columns.
- Fire protection requirements.
- Rack height and structural design.
This integrated approach helps ensure that the rack system fits the actual warehouse instead of treating the spacer as an isolated component.
Row Spacers for Drive-In and Drive-Through Racking
Row spacers can also appear in high-density rack configurations such as drive-in and drive-through systems. JINHUI's drive-through racking system lists Row Spacer among its main structural components, together with upright frames, top beams, back beams, guide rails, and post protectors.
In these systems, spacer selection must be coordinated with the complete rack structure and forklift operating requirements.
For warehouses looking for high-density pallet storage, JINHUI provides Drive Through Racking Systems designed around pallet dimensions, storage depth, load requirements, and warehouse conditions.
How to Check Existing Pallet Rack Row Spacers
Warehouse managers can include row spacers in routine rack inspections.
| Inspection Point | What to Check |
|---|---|
| Spacer position | Confirm the spacer remains at the intended location. |
| Connection hardware | Check for missing, damaged, or visibly loose components. |
| Spacer condition | Look for bending, cracking, severe corrosion, or impact damage. |
| Rack alignment | Check whether back-to-back rows remain consistently positioned. |
| Interference | Confirm the spacer does not interfere with beams, bracing, pallets, or equipment. |
| Configuration changes | Review the spacer arrangement if rack height, depth, or layout has changed. |
If a row spacer or its connection has been damaged by forklift impact or another event, the affected rack should be evaluated before normal operation continues.
How to Select a Pallet Rack System With the Right Accessories
Row spacers are only one part of a complete pallet rack system. A properly engineered warehouse solution should consider the rack frame, beams, bracing, pallet supports, protection components, row spacing, and operating environment together.
For heavy-duty warehouse applications, JINHUI provides industrial heavy duty pallet racks with configurations customized according to pallet size, load capacity, rack dimensions, and warehouse requirements.
For a complete project solution, you can also review JINHUI's warehouse pallet rack solutions.
FAQ About Pallet Rack Row Spacers
What is a pallet rack row spacer used for?
A pallet rack row spacer connects back-to-back rack upright frames and helps maintain the designed distance and alignment between the two rack rows.
Are row spacers required for every pallet rack?
No. Row spacers are primarily associated with back-to-back rack configurations. The requirement depends on the rack design, frame configuration, height-to-depth relationship, building conditions, and applicable engineering requirements.
How do I choose the correct row spacer length?
The length should match the designed distance between the two back-to-back rack frames. The rack manufacturer's engineering drawing should be used to confirm the correct dimension.
Where should row spacers be installed?
The installation locations depend on rack height, upright configuration, bracing, and the manufacturer's design. They should be positioned so that they do not interfere with beams, bracing, pallets, or other rack components.
Can I add row spacers to an existing pallet rack?
Potentially, but compatibility must be checked first. The upright profile, connection holes, rack configuration, and structural design should be reviewed before adding or changing spacers.
Are row spacers the same as pallet rack wall ties?
No. Row spacers are generally used between back-to-back rack rows, while wall ties are used when a rack is positioned along a building wall. Their application and connection conditions are different.
Final Thoughts
Pallet rack row spacers are small but important components in back-to-back rack configurations. They help connect upright frames, maintain consistent rear spacing, support rack alignment, and integrate the two rack rows into the intended warehouse layout.
The correct spacer length, quantity, and installation position should always be based on the rack design rather than a generic rule. When planning a new warehouse rack system, it is best to specify row spacers together with the complete rack structure, pallet dimensions, load requirements, aisle layout, and operating conditions.
Need a customized pallet racking solution?
JINHUI can design and manufacture pallet racking systems according to your pallet dimensions, load requirements, warehouse layout, rack height, storage density, and forklift operation.
WhatsApp: +86 185 0252 7163
Email: info@jhrack.com
Website: https://www.jinhui-rack.com/
