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.
Wheel = wheel diameter · capacity is per caster.




Kick bar floor locks for carts and platform trucks on 4, 5, 6 or 8 in casters, all with a 4 x 4-1/2 in top plate.
Match the floor lock to your caster wheel diameter. All models use a standard 4" × 4-1/2" top plate. Heights from Admin product specs (retracted / extended). Use on level floors only, floor locks are not jacks and are not a substitute for parking brakes on inclines.
| 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"×3-3/8" to 3"×3" |
| FLPLS5 | 5" | 5-1/2" | 6-3/4" | 4" × 4-1/2" | 2-5/8"×3-3/8" to 3"×3" |
| FLPLS6 | 6" | 6-1/2" | 7-3/4" | 4" × 4-1/2" | 2-5/8"×3-3/8" to 3"×3" |
| FLPLS8 | 8" | 8-1/2" | 9-3/4" | 4" × 4-1/2" | 2-5/8"×3-3/8" to 3"×3" |
| Lock | For caster wheel | Top plate | Style |
|---|---|---|---|
| 4 in kick bar lock | 4 in | 4 x 4-1/2 in | Kick bar, rubber foot |
| 5 in kick bar lock | 5 in | 4 x 4-1/2 in | Kick bar, rubber foot |
| 6 in kick bar lock | 6 in | 4 x 4-1/2 in | Kick bar, rubber foot |
| 8 in kick bar lock | 8 in | 4 x 4-1/2 in | Kick bar, rubber foot |
From product titles and listings [S1]. Retracted and extended heights are in the chart above.
Related: kick bar floor locks and floor lock hardware.
Pick the lock that matches your caster wheel diameter: 4, 5, 6 or 8 in. All four use a 4 x 4-1/2 in top plate.
It holds the whole frame, so it works with free-swiveling casters, but it is meant for level floors, not inclines.
Kick the bar up and the rubber foot lifts clear of the floor.
Jordan Wilson, CasterHQ · reviewed October 20, 2026 · 844-439-4335 · info@casterhq.com
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