Swivel vs Rigid Casters: How to Choose the Right Configuration
Posted by Kyle Kim on Oct 5th 2026
Swivel, rigid or swivel with a brake: one decision, three parts
When you specify casters for a cart, you are not making one decision. You are making three, and collapsing them into a single swivel-versus-rigid question leaves two of those decisions unresolved.
The three parts are:
-
How the wheel assembly moves relative to the mount. A swivel caster's wheel assembly rotates around a vertical axis so the wheel can follow a change in push direction. A rigid caster's wheel assembly does not rotate; it rolls only in the direction it is mounted.
-
Whether a brake is part of the configuration. A brake is a separate product feature. It is not implied by caster type, and it is not available on every Carrymaster® family or size.
-
Whether the series and size you need actually offers the configuration you want. In the Carrymaster non-leveling range, rigid, swivel, and swivel-with-brake variants exist within families, but not in every family and not at every size.
These three parts interact. A buyer who selects a caster type without checking brake availability in that family may find that the brake option does not exist at the size they need. A buyer who selects a size without checking mount type may find that the rigid version requires a flat mounting surface they have not planned for.
For sizing questions, the Carrymaster non-leveling caster range is the starting point. Load capacity is a separate calculation covered in a dedicated resource.
What a swivel caster does
A swivel caster has two axes of movement. The wheel spins around its axle to roll forward. The entire wheel assembly also rotates around a vertical axis in the mount, so the wheel can point in a different direction as the cart changes course.
When a push direction changes, the wheel assembly turns to align with the new direction of travel. The wheel does not need to be forced into position; it follows the push because the assembly is free to rotate.
What this means for the mount
The swivel mechanism sits between the wheel assembly and the top plate. The top plate is what attaches to the cart frame. Because the wheel assembly rotates beneath the top plate, the top plate itself stays fixed to the cart while the wheel below it repositions.
On ACSU, ACLU, ACLMU and ACLHU brake versions, the Carrymaster catalogue describes the brake as: "Locks Top Plate & Wheel at the Same Time."
What the Carrymaster swivel range covers
Carrymaster swivel casters are available in flange-mount and stem-mount versions depending on the series. Stem-mount swivel casters appear in the ACSU and ACLU series.
Swivel-with-brake versions are available in several series and sizes, but not all. The configuration table shows which families offer the swivel-with-brake configuration and at what published per-unit rating. Brake availability is the constraint that determines whether the swivel-with-brake configuration is an option for a given application, not the swivel mechanism itself.
What a rigid caster does, and where Carrymaster offers one
A rigid caster has one axis of movement. The wheel spins around its axle to roll forward. The wheel assembly does not rotate around a vertical axis. It is fixed in one direction relative to the mount, and the wheel rolls only in that direction.
There is no mechanism in a rigid caster that allows the wheel to follow a change in push direction. If the cart frame turns, the rigid caster's wheel does not turn with it. The wheel stays aligned with the direction it was mounted.
Where Carrymaster offers rigid casters
All 23 Carrymaster rigid casters in the non-leveling range are flange mount. No rigid stem caster exists in the Carrymaster range.
What that means for the buyer: a flat mounting surface is required. If the cart frame or equipment base does not provide a flat plate for bolting, the rigid Carrymaster caster cannot be installed without modification to the mounting surface.
For buyers deciding between stem and flange mount at the selection stage, the stem vs. flange caster guide covers the mechanical differences and installation implications of each mount type.
Four-caster configurations and where the brakes go
A four-caster cart can be fitted with all swivel casters, all rigid casters, or a mix of swivel at one end and rigid at the other. Each arrangement has a different mechanical result.
All-swivel configuration
When all four casters are swivel, every wheel assembly can rotate around its vertical axis. A change in push direction causes all four wheel assemblies to reorient. The cart can be redirected from any position because no wheel is fixed in one direction.
Swivel at one end, rigid at the other
When two swivel casters are mounted at one end and two rigid casters at the other, the two ends behave differently. The swivel end can reorient its wheels when the push direction changes. The rigid end cannot; those wheels roll only in the direction they are mounted. The cart turns by pivoting around the rigid end, because the rigid wheels resist reorientation while the swivel wheels follow the change.
All-rigid configuration
When all four casters are rigid, no wheel assembly can reorient. All four wheels roll in the direction they are mounted. The cart moves in one direction without the ability to redirect unless the frame is physically repositioned.
Where the brakes go: two separate questions
Brake placement on a cart involves two questions that are often treated as one. The first is which Carrymaster configuration in the selected family includes a brake. The second is how the operator can reach and engage the brake in use.
On the first question, the Carrymaster range answers it at the family and size level. Not every family offers a swivel-with-brake version, and no rigid Carrymaster caster includes a brake. The configuration table shows which families offer all three configurations.
On the second question, the relevant distinction is what the brake is for. Most wheel and caster braking systems are designed to hold a stopped cart in position, not to slow a cart that is already moving. That distinction matters when specifying a cart that will be used on an incline or decline, where the risk of losing control of a manually moved cart increases. A brake designed to hold a parked cart may not be sufficient if the application also requires control while the cart is in motion.
Separately from what the brake does, the operator must be able to reach and engage it in normal use and in a situation where the cart begins to move unexpectedly. Where the brake is placed on the cart frame affects whether that access is practical.
The Carrymaster brake, when present, is on the swivel caster itself. Placement of braked casters on the cart frame is a cart-design decision.
One series, three configurations, one rating
The most important catalogue fact in the Carrymaster non-leveling range is this: in all 23 of 23 configuration families, the rigid version, the swivel version, and the swivel-with-brake version carry the identical published per-unit rating. Caster type does not change the rating. Series and size code do.
This means a buyer who needs a brake does not pay for it with a lower load rating. It also means a buyer who assumes the rigid version carries more load than the swivel version in the same family is working from a false premise.
The table below lists the 23 Carrymaster non-leveling families offered in both rigid and swivel versions, each with its size code, published per-unit rating, and available configurations. For dimensional comparison across wheel sizes, use the wheel size reference. For load capacity methodology, see the caster wheel load capacity guide.
|
Series |
Size Code |
Capacity (lbs/ea) |
Configurations Available |
|---|---|---|---|
|
40 |
33.07 |
Rigid flange, swivel flange, swivel stem |
|
|
ACSU |
50 |
44.09 |
Rigid flange, swivel flange, swivel stem |
|
ACSU |
64 |
66.14 |
Rigid flange, swivel flange, swivel stem, swivel grip ring stem, each swivel also with brake |
|
ACSU |
76 |
77.16 |
Rigid flange, swivel flange, swivel stem, swivel grip ring stem, each swivel also with brake |
|
ACSU |
102 |
88.18 |
Rigid flange, swivel flange, swivel stem, swivel grip ring stem, each swivel also with brake |
|
100 |
220.46 |
Rigid flange, swivel flange, swivel stem, each swivel also with brake |
|
|
ACLU |
127 |
242.51 |
Rigid flange, swivel flange, swivel stem, each swivel also with brake |
|
ACLU |
150 |
264.55 |
Rigid flange, swivel flange, swivel stem, each swivel also with brake |
|
100 |
352.74 |
Rigid flange, swivel flange, swivel flange with brake |
|
|
ACLMU |
125 |
418.88 |
Rigid flange, swivel flange, swivel flange with brake |
|
ACLMU |
150 |
485.02 |
Rigid flange, swivel flange, swivel flange with brake |
|
100 |
529.11 |
Rigid flange, swivel flange, swivel flange with brake |
|
|
ACLHU |
125 |
595.25 |
Rigid flange, swivel flange, swivel flange with brake |
|
ACLHU |
150 |
661.39 |
Rigid flange, swivel flange, swivel flange with brake |
|
400 |
441 |
Rigid, swivel (twin nylon wheels) |
|
|
75 |
881.85 |
Rigid flange, swivel flange |
|
|
ACMU |
100 |
992.08 |
Rigid flange, swivel flange |
|
ACMU |
125 |
1,102.31 |
Rigid flange, swivel flange |
|
ACMU |
150 |
1,212.54 |
Rigid flange, swivel flange |
|
75 |
1,433.00 |
Rigid flange, swivel flange |
|
|
ACMM |
100 |
1,543.24 |
Rigid flange, swivel flange, swivel flange with brake |
|
ACMM |
125 |
1,653.47 |
Rigid flange, swivel flange, swivel flange with brake |
|
ACMM |
150 |
1,763.70 |
Rigid flange, swivel flange, swivel flange with brake |
Read across any row: the published lbs/ea applies to every configuration offered in that family. A buyer choosing between swivel and swivel-with-brake in the ACLU-127 family, for example, works with the same 242.51 lbs/ea for both. The configuration choice does not change the number.
Where the brake options stop
Not every Carrymaster family offers a brake, and knowing where the brake options stop before finalizing a specification avoids a rebuild later.
The configuration table shows which families offer swivel-with-brake. The specific boundaries are:
-
ACMU, all four sizes (75, 100, 125, 150): no brake version exists. Rigid flange and swivel flange only.
-
ACMM 75 at 1,433.00 lbs/ea: no brake version exists. Rigid flange and swivel flange only.
-
ACSU 40 at 33.07 lbs/ea and ACSU 50 at 44.09 lbs/ea: no brake version exists. Rigid flange, swivel flange, and swivel stem only.
-
ACTM 400 at 441 lbs/ea: no brake version exists. Rigid and swivel only.
The highest-rated family that offers all three configurations, rigid, swivel, and swivel-with-brake, is the ACMM 150 at 1,763.70 lbs/ea.
The flange wheel brake models
In addition to the swivel-with-brake casters in the table above, Carrymaster offers two dedicated flange wheel brake models. Their product pages do not state swivel or rigid:
-
ACM-600FB: 1,764 lbs/ea
-
ACM-800FB: 2,205 lbs/ea
These two models sit above the ACMM 150 in per-unit rating. They are the only Carrymaster brake-equipped options above 1,763.70 lbs/ea.
What the Carrymaster brake does
On ACSU, ACLU, ACLMU and ACLHU brake versions, the Carrymaster catalogue describes the brake as "Locks Top Plate & Wheel at the Same Time." The ACMM brake versions' pages do not describe the brake. The catalogue lists no rigid caster with a brake.
Most wheel and caster braking systems are designed to hold a stopped cart in position, not to slow a moving one. If the application involves an incline or decline where control during movement matters, confirm whether a parking-style brake is sufficient or whether a different control method is needed.
For a full view of what the Carrymaster range covers by capacity band, see the caster load capacity ranges guide and the load capacity reference.
Choosing your configuration
The selection path works through three questions in order. Answer each one with catalogue facts, not assumptions.
1. Do you need every caster to turn, or one end fixed in direction?
If every caster needs to rotate around its vertical axis to follow direction changes, the specification is all-swivel. If one end should remain fixed in its mounted direction while the other end can reorient, the specification is swivel at one end and rigid at the other. If no caster should reorient, all-rigid applies. The answer to this question determines which configuration column in the table is relevant to your application.
2. Do you need a brake, and is one offered in that series and size?
If the application requires a brake, check the configuration table before finalizing the series and size. ACMU in all four sizes, ACMM 75, ACSU 40 and 50, and ACTM 400 do not offer a brake version. If the application requires both a rigid caster and a brake on the same cart, the brake must come from a swivel-with-brake caster in a compatible family, not from the rigid caster itself.
Also confirm what the brake needs to do. On ACSU, ACLU, ACLMU and ACLHU brake versions, the Carrymaster catalogue describes the brake as "Locks Top Plate & Wheel at the Same Time." If the application involves an incline where control during movement is the concern, that is a separate design question outside the caster specification.
3. Mount type, wheel-size band, and the published lbs/ea rating.
All Carrymaster rigid casters are flange mount. Swivel casters are flange mount or stem mount depending on the series. Confirm the mounting surface before selecting a rigid caster. Confirm the stem type before selecting a stem-mount swivel caster.
Check the published lbs/ea in the table for the selected family and size. That figure applies to every configuration in that row. If the equipment must also stand level, see the leveling casters guide.
If the combination you need, series, size, configuration, and mount type, is not clear from the table, contact the Zambus team directly. Reach us at zambus.com/contact-us or by phone at (973) 777-4922. Zambus can confirm availability for matched swivel, rigid, and brake sets.
Frequently asked questions
Can I replace a rigid caster with a swivel caster on the same mounting holes?
Not always. Within a Carrymaster family, the rigid and swivel flange versions share the series and size code, but the product pages do not confirm that their top-plate hole patterns match. Before swapping one for the other, compare the dimension drawings on both product pages, or send Zambus the model numbers of the caster you are removing and the one you plan to fit.
Do swivel and rigid casters on the same cart need the same wheel size?
Within a Carrymaster family and size code, the rigid, swivel and brake versions are listed in the same wheel-size band; ACLMU 125, for example, sits in the 4 to 5 inch band. Overall caster height is not stated on the product pages, so compare the dimension drawings on each product page before combining casters from different families on one cart.
Does the Carrymaster ACTM-400 come in both rigid and swivel versions?
Yes. The Carrymaster ACTM-400 is offered as a rigid caster and as a swivel caster, and both versions are rated 441 lbs per unit with twin nylon wheels. Neither version is offered with a brake, so a cart that needs braking cannot get it from an ACTM-400. Both versions are listed in the Carrymaster ACTM series.
Can a Carrymaster rigid caster have a brake?
No Carrymaster product is listed as a rigid caster with a brake. Brake versions are swivel casters, the SFB, SSB and SGRB variants, plus two flange wheel brake models, ACM-600FB at 1,764 lbs/ea and ACM-800FB at 2,205 lbs/ea, whose product pages do not state swivel or rigid. A cart with rigid casters gets its braking from the swivel corners.
What does the brake on a Carrymaster swivel caster lock?
The product pages for Carrymaster ACSU, ACLU, ACLMU and ACLHU brake versions describe the brake in one line: it "Locks Top Plate & Wheel at the Same Time." The pages give no further detail on the mechanism. The ACMM brake versions' pages do not describe their brake, so confirm its function with Zambus before specifying an ACMM brake caster.
Which Carrymaster casters above 1,000 lbs per unit come with a brake?
Five Carrymaster products above 1,000 lbs per unit come with a brake: the swivel flange brake versions ACMM-100SFB at 1,543.24 lbs/ea, ACMM-125SFB at 1,653.47 lbs/ea and ACMM-150SFB at 1,763.70 lbs/ea, plus the flange wheel brake models ACM-600FB at 1,764 lbs/ea and ACM-800FB at 2,205 lbs/ea.
Can I add a brake to a caster I already own?
Not as an add-on. The Carrymaster catalogue lists no add-on brake; brakes come built into separate brake-version products. To add braking to a cart, replace the existing caster with the brake version of the same family and size, where one exists, so the published rating stays the same. Zambus can confirm the matching brake version by phone at (973) 777-4922.
Do rigid casters carry more load than swivel casters?
No. In the Carrymaster non-leveling range, caster type does not set the per-unit rating; series and size code do, and the figure is identical for every configuration within a family. Across series the ratings differ widely regardless of type: a Carrymaster ACMM-75SF swivel is rated 1,433.00 lbs/ea, while a Carrymaster ACLU-150RF rigid is rated 264.55 lbs/ea.
Do Carrymaster stem-mount casters come with a brake?
Yes. Carrymaster offers swivel stem casters with a brake in two series. ACSU brake versions come in size 64 (66.14 lbs/ea), 76 (77.16 lbs/ea) and 102 (88.18 lbs/ea), including grip ring stem versions. ACLU brake versions come in size 100 (220.46 lbs/ea), 127 (242.51 lbs/ea) and 150 (264.55 lbs/ea).
How do I order a matched set of swivel, rigid and brake casters from Zambus?
Identify the series, size code and configuration for each corner of the cart, rigid or swivel, with or without a brake, then send those selections to Zambus. Choosing all four casters from one Carrymaster family and size code keeps the published rating the same at every corner. Reach Zambus at zambus.com/contact-us or by phone at (973) 777-4922.