The three terms describe which motion a caster lock stops: a swivel lock stops swiveling only, a directional lock stops swiveling at indexed positions, and a total lock stops both wheel roll and swivel.
Because suppliers use 'brake' and 'lock' interchangeably and label the same functions differently, the reliable spec is the motion to be stopped plus the number of casters carrying it, not the lock name.
If the cart must be parked and held still, a swivel or directional lock alone does not stop the wheel; specify a wheel brake or total lock.
Why a lock name alone will not get you the right quote
A caster lock is defined by the motion it stops, not by the word on the catalog page. Grainger's catalog defines brake as preventing rolling, swivel lock as preventing turning, and total lock as preventing both 9 .
Bullcaster uses a different set: total lock, side lock (which it equates with directional lock), and top lock, where the top lock is described as a pedal that presses a pad onto the wheel 8 . The same physical function can therefore appear under two different names at two suppliers.
A name you recognize may mean something else in the next quote. The words themselves are also loose.
In caster terminology, brake and lock are often used interchangeably, though technically a brake resists by friction and can be overcome with enough force, while a lock uses positive engagement such as a pin or cam that physically prevents movement 25 .
A total-lock caster is described as combining both: a friction brake on the wheel and a positive lock on the swivel 25 . For your RFQ, that means a line reading "with brake" or "with lock" is not a specification.
Write the motion instead: wheel roll stopped, swivel stopped, or both. Any quote that names a lock without saying which motion it stops should be sent back for clarification before you compare it with the others.
Decide per caster which motion must stop
Work through the cart's actual behavior and pick the lock that matches it. The four mechanisms are not interchangeable, and each stops a different combination of motions 2 .
| Lock type | Motion stopped | What the cart can still do |
|---|---|---|
| Total lock (double lock, full lock) | Wheel roll and swivel together | Nothing — caster is immobilized |
| Brake-only (tread lock) | Wheel roll only | Still swivels |
| Swivel lock | Swivel only | Wheel still rolls |
| Directional (position) lock | Swivel, at indexed positions such as 0/90 | Wheel still rolls |
Do not use a swivel or directional lock as the parking brake
A directional lock holds the swivel at set positions, and a swivel lock holds direction continuously, but neither stops the wheel from rolling 2 , 6 , 13 . One manufacturer states plainly that directional brakes cannot replace wheel brakes, and that if the device needs to be parked still, a suitable braking method is still required 14 .
If your cart must stand still under load, on a slope, or while someone works from it, the lock has to act on the wheel. A wheel brake does that by pressing a pad or compression structure against the wheel surface 14 .
A total lock goes further and stops both motions at once, which is why it is the type described for equipment that must not shift when parked 14 . So the sequence is: first confirm the cart must be held still, then require a wheel brake or total lock.
A swivel or directional lock is a steering aid, not a parking device.
Set how many casters carry the lock
The quantity of locking hardware is a separate line in the spec, and it changes with the floor and the load. Two brakes diagonally opposed is described as the industrial standard for holding a cart on level floors 3 .
Where the cart sits on slopes or ramps, or where staff lean on it during use, total lock on at least two casters is recommended 3 .
A quote for one brake on a four-caster cart is therefore not the same offer as a quote for two, and neither is the same as a quote for four. State the count and the positions in the RFQ so every supplier prices the same hardware.
Confirm the actuation the operator will use
The lock has to be engaged and released in the cart's real handling routine, and the actuation method decides whether that is practical. Where equipment is moved and repositioned multiple times a day, foot-lever or linkage-handle actuation is described as more efficient than manual adjustment 18 .
Total lock is described as engaged by one foot pedal 2 . If your operators park and release the cart many times per shift, the pedal or lever they will actually reach for belongs in the spec.
A lock that is awkward to release gets left disengaged, and the cart rolls.
Verify the conditions that change whether the quoted lock holds
Brake holding force is not quoted as an absolute number. It is evaluated at the caster's rated load capacity under ANSI/ICWM test procedures, and effectiveness drops on wet, dusty, or inclined surfaces 20 .
Ask the supplier to confirm each of the following against your actual operating conditions before you accept the quote.
- ✓Ask for the brake holding performance to be stated at the caster's rated load, per ANSI/ICWM test procedures.
- ✓Confirm the floor condition the rating assumes — wet, dusty, or inclined surfaces reduce brake effectiveness.
- ✓Check the load calculation uses the total cart plus load divided by the number of casters minus one, with a safety factor.
- ✓Confirm the lock type quoted matches the motion you specified, not just the lock name.
Normalize every quote to the same lock wording before comparing price
Brake and lock mode is a named cost driver, and quotes that include a simple brake, a directional lock, a total lock, or a central lock are not price-comparable 27 , 31 . The fix is to send every supplier the same specification: the motion to be stopped, the number of casters carrying the lock, the actuation method.
And the load and floor conditions the lock must hold under 27 . One more point to settle before you order: locking mechanisms are integrated into the caster at manufacture, and retrofitting a brake onto a non-locking caster is described as not practical or safe 20 .
If you might need a lock later, specify it now rather than planning to add it.
Where the sources disagree on swivel and directional locks as parking brakes
One source states directly that a directional lock cannot replace a wheel brake and that a separate braking method is still needed to park the device 14 . Other sources list swivel lock as a lock type alongside brake-only and total lock without stating whether it can hold the cart parked 2 , 6 .
The disagreement matters because it decides whether you can specify a swivel lock alone for a cart that must stay put.
| Disputed item | One source reports | Another reports | What the buyer should do |
|---|---|---|---|
| Swivel/directional lock as parking brake | Cannot replace a wheel brake; separate braking still needed to park | Listed as a lock type without stating it can park the cart | Ask the supplier to confirm in writing whether the quoted swivel lock holds the cart parked |
What the sources do not establish
- Whether lock types are mutually exclusive or can be combined on a single caster — no source confirms combinability.
- Any numeric braking force or torque rating per caster or per lock type, and any derating value when a lock is engaged.
- Any quantified effect of tread material or hardness on braking performance.
- Any mapping of buyer lock terms to specific EN 12530 or EN 12532 clauses.
- Any price adder, MOQ, tooling charge, or lead-time impact per lock type.
- Any lock cycle-life data or specific lock certification.
- Any single-pedal multi-function actuation matrix covering all lock types.
Sources · 13
- 2casterhq.comIndustry publication2026-09
- 3casterhq.comIndustry publication
- 5casterhq.comIndustry publication2026-04
- 6casterhq.comIndustry publication2026-09
- 8bullcaster.comManufacturer technical documentation2024-01
- 9grainger.comIndustry publication
- 13casterspecialists.comIndustry publication2024-05
- 14globe-caster.comIndustry peer technical page
- 18dersheng.com.twManufacturer technical documentation2026-08
- 20infordcaster.comManufacturer technical documentation2026-05
- 25infordcaster.comManufacturer technical documentation2026-05
- 27secure-caster.comManufacturer technical documentation2026-08
- 31secure-caster.comManufacturer technical documentation2026-08
Technical references cited for verifiability — not supplier recommendations.Browse the research library.