Industrial Casters. Engineered for Spec.
The 3-1/8" × 4-1/8" top plate is a popular light-duty caster pattern used when you need a larger mounting footprint than the 2-3/8" × 3-5/8" without jumping into medium or heavy duty. It supports up to 350 lbs per caster with wheel diameters from 3" to 5" and is common on hospital carts, AV equipment, and industrial tool boxes.
Rated up to 350 lbs per caster depending on wheel material, diameter, and bearing type. A four-caster cart carries up to 1,400 lbs total. For heavier applications, step up to the 4" × 4-1/2" or 4-1/2" × 6-1/4" plate patterns in medium and heavy duty.
The ÷3 formula (instead of ÷4) accounts for the reality that on uneven surfaces one caster temporarily lifts, redistributing its load across the remaining three.
This plate is the go-to pattern for hospital and lab carts, AV carts, mobile tool chests, retail fixtures, mailroom carts, and light institutional furniture. The larger footprint gives you more bolt-hole clearance and a more stable mount than the smaller 2-3/8" × 3-5/8" plate.
On smooth floors (vinyl, sealed concrete, hardwood) choose non-marking thermoplastic rubber or polyurethane. On carpet, hard rubber or hard plastic rolls easier. Around fluids or chemicals, polyurethane resists absorption. For high-temperature applications (ovens, bakeries), specify phenolic.
Both share the 350 lb rating, but 3-1/8" × 4-1/8" has a larger mounting footprint with more bolt-hole clearance. Choose 3-1/8" × 4-1/8" when designing new equipment that needs a more stable mount, or when replacing larger legacy carts. Choose 2-3/8" × 3-5/8" for smaller furniture, mailroom carts, and tighter footprints.
| Specification | Value |
|---|---|
| Wheel Diameter | 2" – 5" |
| Load Capacity | Up to 350 lbs/caster |
| Wheel Materials | Rubber, Polyurethane, TPR, Nylon |
| Tread Width | 3/4" – 1-1/4" |
| Mount Types | Top Plate, Stem, Grip Ring, Expanding |
| Plate Sizes | 2-3/8"x3-5/8" & 3-1/8"x4-1/8" |
| Bearing Type | Plain, Ball, Precision Ball |
| Brake Options | Side Lock, Total Lock, Top Lock |
| Feature | Light Duty | Medium Heavy Duty |
|---|---|---|
| Load Range | ★ Up to 350 lbs | 350–1,200 lbs |
| Wheel Materials | ★ Rubber, Poly, TPR, Nylon | Polyurethane, Phenolic, Steel |
| Floor Protection | ★ Excellent (soft tread) | Good (harder wheels) |
| Noise Level | ★ Very Quiet | Moderate |
| Mount Options | ★ Plate, Stem, Grip Ring, Expanding | Plate, Stem |
| Best For | ★ Office, furniture, retail, healthcare | Carts, dollies, light industrial |
These calculators apply to any caster application—even if you’re browsing a different category. Use them to estimate load rating per caster, select wheel material, and estimate push/pull force. Expand any tool for full analysis + a share-ready spec line.
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