Up to 350 lbs
Up to 7,000 lbs
Up to 16,000 lbs
Up to 40,000 lbs
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Outdoor / rough terrain
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All measurements indicate the wheel diameter by the tread width.
The below capacity ranges indicate the working (dynamic) load that each caster will support. A safety factor should be included in your formula to determine your required load rating per caster.
W/(C-1)=R W is total weight needed to move. C is total number of casters required. R is ideal load rating, with safety factor built in. Divide the total load weight by one less caster than you will use to safely determine load rating.
Plate dimensions shown are overall mounting plate size.
When replacing existing casters, select the closest plate size and verify bolt-hole compatibility.
BHP = Bolt Hole Pattern, shown under each plate.




Kick bar floor locks for 4, 5, 6 and 8 in casters, on a 4 x 4-1/2 in top plate with a rubber foot. Step on the pedal to hold a cart or platform truck in place on a level floor.
Match the floor lock to your caster wheel diameter. All models use a 4 x 4-1/2 in top plate. Heights are retracted and extended. Use on level floors only: a floor lock is not a jack and does not replace a parking brake on a slope.
| Part # | For caster size | Retracted height | Extended height | Top plate | Bolt hole pattern |
|---|---|---|---|---|---|
| FLPLS4 | 4" | 4-5/8" | 5-7/8" | 4" × 4-1/2" | 2-5/8" x 3-5/8" slotted to 3" x 3" |
| FLPLS5 | 5" | 5-1/2" | 6-3/4" | 4" × 4-1/2" | 2-5/8" x 3-5/8" slotted to 3" x 3" |
| FLPLS6 | 6" | 6-1/2" | 7-3/4" | 4" × 4-1/2" | 2-5/8" x 3-5/8" slotted to 3" x 3" |
| FLPLS8 | 8" | 8-1/2" | 9-3/4" | 4" × 4-1/2" | 2-5/8" x 3-5/8" slotted to 3" x 3" |
| Part | Caster size | Retracted height | Extended height |
|---|---|---|---|
| FLPLS4 | 4 in | 4-5/8 in | 5-7/8 in |
| FLPLS5 | 5 in | 5-1/2 in | 6-3/4 in |
| FLPLS6 | 6 in | 6-1/2 in | 7-3/4 in |
| FLPLS8 | 8 in | 8-1/2 in | 9-3/4 in |
From product spec fields [S1]. All use a 4 x 4-1/2 in top plate.
A caster brake stops one wheel from turning. A floor lock leaves the wheels alone and presses a rubber foot onto the floor, which also stops the cart from rocking or sliding sideways during loading. It is not a jack: it does not lift or carry the cart's weight.
Wheel brakes and swivel locks: swivel locks.
Pick the one that matches your caster diameter: FLPLS4 for 4 in, FLPLS5 for 5 in, FLPLS6 for 6 in and FLPLS8 for 8 in casters.
No. Use it only on flat, level floors.
No. It presses a rubber pad on the floor to hold the cart; it does not carry the weight.
Jordan Wilson, CasterHQ · reviewed October 20, 2026 · 844-439-4335 · info@casterhq.com
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