Pallet Racking Components Explained: Uprights, Beams, Frames and Accessories
Quick answer: A pallet racking system is made up of uprights (vertical columns), joined by bracing into frames, with horizontal beams that hook into the uprights to carry the pallets. Safety locks hold the beams in place, base plates and anchors fix the frames to the floor, row spacers tie back-to-back runs together, and decking and protection finish the system. All of it is engineered to work together, which is why the parts shouldn’t be mixed between brands.
Most people only look closely at their racking when something goes wrong: a forklift clips an upright, or a new client means you suddenly need another 200 pallet positions. That’s usually when the questions start. What is this part called? Can we add another beam level? Will the beams from our old supplier fit?
This guide walks through every part of a standard adjustable pallet racking system, what it does, and what to look out for when you buy, extend or reconfigure. If you’re still deciding between racking types, start with our article on how to choose the right pallet racking system and come back here once you know what you need.
What are uprights and frames?
An upright is the vertical steel column that carries the full weight of everything stored in the bay. It’s punched with slots along its length so beams can be fitted at different heights. That slotting is what makes adjustable pallet racking adjustable.
A frame is two uprights joined by horizontal and diagonal bracing. The bracing stops the uprights from buckling sideways and gives the frame its strength. When suppliers quote a frame, they normally give you three numbers: the height, the depth (to match your pallet), and the load the frame can carry.
Frame height depends on your roof, sprinklers and forklift reach. We cover the details in our article on how high pallet racking can go. In coastal sites, cold stores or anywhere with moisture, it’s worth looking at galvanised racking rather than painted frames.
What do pallet racking beams do?
Beams are the horizontal members that run between two frames and carry the pallets. Each beam has a welded end connector with hooks that lock into the slots on the upright. A pair of beams makes one storage level.
There are two common profiles:
- Box beams: a closed rectangular section, good all-rounders for standard pallet loads.
- Step beams: have a ledge along the inside edge so decking panels or pallet supports can sit flush with the top of the beam.
Beam capacity is rated per pair, per level, and depends on the beam length and section size. A longer beam carries less than a shorter beam of the same profile. Before adding weight or changing pallet sizes, calculate the load capacity you need and check it against the rating on the load sign.
Why are safety locks so important?
A safety lock (also called a safety pin or beam lock) is a small clip that goes through the beam connector and the upright. It stops the beam from lifting out of its slots if a forklift tine or a pallet bumps it from below.
It’s a tiny part, but a missing lock is one of the most common findings on an inspection. Every beam end should have one. If you move beam levels around, put the locks back before you load the bay.
Base plates, anchors and row spacers
Base plates sit at the foot of each upright and spread the load into the floor slab. Anchor bolts fix the base plates to the concrete so the frame can’t shift or tip when it’s knocked. Every upright should be anchored. Shims (thin steel packers) are used under base plates to level the racking on an uneven floor.
Row spacers connect two frames standing back to back, keeping the gap between them consistent and making the double run more stable. Wall ties do a similar job where racking runs along a wall, though they shouldn’t be relied on to hold racking up.
Which decking options can go on pallet racking?
Decking sits across the beams and gives you a surface for loads that aren’t on a perfect pallet, or for stopping items falling through. The main options are:
| Decking type | Best for | Watch out for |
|---|---|---|
| Wire mesh decking | General use, cold stores, sites with sprinklers (water and light pass through) | Must be rated for the load and seated properly on the beams |
| Chipboard / timber panels | Small cartons and hand-picked stock | Swells if it gets wet, and can block sprinkler water |
| Steel panels | Heavy or point loads | Heavier and more expensive than mesh |
| Pallet support bars | Pallets that are weak or sit across the beams the wrong way | Not a full surface, so loose items can still drop |
Protection and signage
These parts don’t carry any load, but they protect the parts that do:
- Column (upright) guards: steel or polymer guards around the bottom of uprights, where most forklift impacts happen.
- End-of-aisle barriers: shield the end frames from turning forklifts.
- Load signs: show the safe working load per level and per bay. If you don’t have them, your team is guessing.
- Anti-collapse mesh: fitted to the back of runs next to walkways so items can’t be pushed off.
If your racking is already taking knocks, read our follow-up on damaged pallet racking: repair or replace.
Can you mix pallet racking components from different manufacturers?
Short answer: no, not without an engineer signing it off. Slot patterns, connector hooks and load ratings are designed as one system. A beam from one brand might seem to fit another brand’s upright, but the connection won’t behave the way either manufacturer tested it, and the load rating no longer means anything.
If you’re extending an older installation, send the supplier photos and measurements of your existing uprights and beams first. Sometimes the original system is still made. Sometimes it makes more sense to start a new run with matching components rather than patch two systems together.
How the components affect load capacity
The weakest part sets the limit. Your beams might be rated for 2,000 kg per level, but if the frames were specified for lighter loads, or the gap between the floor and the first beam level is large, the bay’s capacity drops. Changing beam heights changes the frame’s capacity too, which is why reconfiguring should be checked rather than done on the fly.
Our article on warehouse racking load limits explains how the ratings work, and the guide to adjustable pallet racking covers layouts and configurations in more detail.
Planning a new installation or an extension?
Palian designs and manufactures its own adjustable pallet racking, so every component is made to work together. Look at a racking maintenance plan to keep existing racking in shape, or speak to the Palian team about the right components for your warehouse.
Frequently Asked Questions
What is the difference between an upright and a frame?
An upright post is a single vertical column. A frame consists of two upright posts joined by horizontal and diagonal bracing. Beams connect to the upright posts to form the storage levels.
Can I add extra beam levels to my existing pallet racking?
Possibly, but adding or moving beam levels can change the racking’s rated load capacity. Have the manufacturer or a competent racking designer approve the revised layout, and update the load notices before use.
Does pallet racking need to be bolted to the floor?
Yes. Conventional forklift-served pallet racking should be anchored through its base plates to a suitable floor slab, according to the manufacturer’s installation design. Anchoring helps maintain stability but does not make the racking impact-proof.
Do I need safety locks on every beam?
Yes. On racking with hooked beam connections, each beam end must have the manufacturer-specified safety lock or retention device correctly engaged. These devices help prevent beams from being accidentally dislodged, including when struck from below.