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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.

BHP: 1-3/4″ × 2-7/8″, slotted to 3″
BHP: 1-3/4″ × 2-7/8″, slotted to 3″
BHP: 1-3/4″ × 2-15/16″ slotted to 2-3/8″ × 3-3/8″
BHP: 1-3/4″ × 2-15/16″ slotted to 2-3/8″ × 3-3/8″
BHP: 2-5/8” X 3-5/8” (Slotted to 3” x 3”)
BHP: 2-5/8” X 3-5/8” (Slotted to 3” x 3”)
BHP: 2-7/16" x 4-15/16" slotted to 3-3/8" x 5-1/4"
BHP: 2-7/16" x 4-15/16" slotted to 3-3/8" x 5-1/4"
(3″ Wide Casters), Industry-Standard
(3″ Wide Casters), Industry-Standard
BHP: 3-3/8" x 5-1/4" slotted to 4-1/8" x 6-1/8"
BHP: 3-3/8" x 5-1/4" slotted to 4-1/8" x 6-1/8"
BHP: 4-1/8" x 6" slotted to 4-1/2" x 6-1/8"
BHP: 4-1/8" x 6" slotted to 4-1/2" x 6-1/8"
View All • 21 Plate Sizes
View All • 21 Plate Sizes
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Caster Wheel Materials & Selection Guide

Caster Wheel Materials & Selection Guide
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Son of Mini-Mite

Diameter: 3-1/8 inTread: 3 inCapacity: up to 6,000 lb
Nylon and steel casters here serve chemical, food-contact, and washdown carts. Catalog chips cover wheel diameters 3-1/8 in, nylon and steel treads, and industrial frames. Nylon resists moisture uptake and many chemicals on food and pharma carts. Use kingpinless or heavy plate series when shock loads keep shearing kingpin races. These heavy-duty options cover everyday chemical, food-contact, and washdown carts without jumping to extreme forged series.

Shop by wheel material

3 types

Rubber and polyurethane favor floor protection; phenolic and steel favor heavy capacity. Compare materials →

3500 lbs
TieredPricing
Hamilton Dual Wheel Swivel Caster 3500 lbs. Load Capacity - Son of Mini-Mite Low Profile with 3 1/8" x 3" Nylon Roller, (2) Needle Thrust Bearings & (2) Needle Roller Bearings - 3/4" Axle - S-SOMM2-313NY Hamilton
Made to Order · 4-6 Wk
Hamilton S-SOMM2-313NY 3 1/8" x 3" Nylon Swivel Dual Wheel Caster – 3500 lb
Part # S-SOMM2-313NY
$1,271.00
Volume pricing available
Nylon
Load rating
3500 lbs
Diameter 3-1/8"
Capacity 3500 lbs
Wheel Nylon
More Details Less Details
Width 3"
Height 4.75"
Temp Range -20°F to 180°F
Rig Type Swivel
Brake No Brake
Frame Zinc Plated Steel
Hamilton Dual Wheel Swivel Caster - Model S-SOMM2-313NY 3500 lbs Load Capacity | Son...
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6000 lbs
TieredPricing
Hamilton Son of Mini-Mite 6000 lbs Load Capacity Swivel Caster - Low Profile Dual Wheel, 3 1/8" x 3" Steel Roller with Needle Bearings, 3/4" Axle - S-SOMM2-313FS Hamilton
Made to Order · 4-6 Wk
Hamilton S-SOMM2-313FS 3 1/8" x 3" Steel Swivel Dual Wheel Caster – 6000 lb
Part # S-SOMM2-313FS
$1,674.00
Volume pricing available
Load rating
6000 lbs
Diameter 3-1/8"
Capacity 6000 lbs
More Details Less Details
Width 3"
Height 4.75"
Temp Range -20°F to 180°F
Rig Type Swivel
Brake No Brake
Frame Zinc Plated Steel
Hamilton Son of Mini-Mite Swivel Caster - S-SOMM2-313FS Optimal Performance & Durability | Load...
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2500 lbs
TieredPricing
Hamilton Low Profile 2500 lbs. Load Capacity Swivel Caster - Dual Wheel 3 1/8" x 3" Poly on Steel Roller - With Needle Thrust & Roller Bearings on 3/4" Axle - Son of Mini-Mite S-SOMM2-313D70 Hamilton
Made to Order · 4-6 Wk
Hamilton S-SOMM2-313D70 3 1/8" x 3" Poly Dual Wheel Swivel Caster – 2500 lb
Part # S-SOMM2-313D70
$1,520.00
Volume pricing available
Polyurethane
Load rating
2500 lbs
Diameter 3-1/8"
Capacity 2500 lbs
Wheel Polyurethane
More Details Less Details
Width 3"
Height 4.75"
Temp Range -20°F to 180°F
Rig Type Swivel
Brake No Brake
Frame Zinc Plated Steel
Hamilton Low Profile Dual Wheel Swivel Caster - S-SOMM2-313D70 Engineered for Optimal Performance |...
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4000 lbs
TieredPricing
Hamilton 4000 lbs Load Capacity Swivel Caster - Son of Mini-Mite Low Profile - 3 1/8" x 3" Steel Roller - Dual Needle Thrust & Roller Bearings - 3/4" Axle Hamilton
Made to Order · 4-6 Wk
Hamilton 3 1/8" x 3" Steel Swivel Caster – 4000 lb
Part # S-SOMM-313FS
$1,142.00
Volume pricing available
Load rating
4000 lbs
Diameter 3-1/8"
Capacity 4000 lbs
More Details Less Details
Width 3"
Height 4.75"
Temp Range -20°F to 180°F
Rig Type Swivel
Brake No Brake
Frame Zinc Plated Steel
Hamilton 4000 lbs Load Capacity Swivel Caster: Son of Mini-Mite Low Profile Design Premium...
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3500 lbs
TieredPricing
Hamilton Dual Wheel Rigid Caster 3500 lbs. Load Capacity - Son of Mini-Mite Low Profile with 3 1/8" x 3" Nylon Roller, (2) Needle Thrust Bearings & (2) Needle Roller Bearings - 3/4" Axle - R-SOMM2-313NY Hamilton
Made to Order · 4-6 Wk
Hamilton R-SOMM2-313NY 3 1/8" x 3" Nylon Rigid Dual Wheel Caster – 3500 lb
Part # R-SOMM2-313NY
$1,276.00
Volume pricing available
Nylon
Load rating
3500 lbs
Diameter 3-1/8"
Capacity 3500 lbs
Wheel Nylon
More Details Less Details
Width 3"
Height 4.75"
Temp Range -20°F to 180°F
Rig Type Rigid
Brake No Brake
Frame Zinc Plated Steel
Hamilton Dual Wheel Rigid Caster - Model R-SOMM2-313NY 3500 lbs Load Capacity | Son...
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6000 lbs
TieredPricing
Hamilton Son of Mini-Mite 6000 lbs Load Capacity Rigid Caster - Low Profile Dual Wheel, 3 1/8" x 3" Steel Roller with Needle Bearings, 3/4" Axle - R-SOMM2-313FS Hamilton
Made to Order · 4-6 Wk
Hamilton R-SOMM2-313FS 3 1/8" x 3" Steel Rigid Dual Wheel Caster – 6000 lb
Part # R-SOMM2-313FS
$1,446.00
Volume pricing available
Load rating
6000 lbs
Diameter 3-1/8"
Capacity 6000 lbs
More Details Less Details
Width 3"
Height 4.75"
Temp Range -20°F to 180°F
Rig Type Rigid
Brake No Brake
Frame Zinc Plated Steel
Hamilton Son of Mini-Mite Rigid Caster - R-SOMM2-313FS Optimal Performance & Durability | Load...
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2500 lbs
TieredPricing
Hamilton Low Profile 2500 lbs. Load Capacity Rigid Caster - Dual Wheel 3 1/8" x 3" Poly on Steel Roller - With Needle Thrust & Roller Bearings on 3/4" Axle - Son of Mini-Mite R-SOMM2-313D70 Hamilton
Made to Order · 4-6 Wk
Hamilton R-SOMM2-313D70 3 1/8" x 3" Poly Rigid Dual Wheel Caster – 2500 lb
Part # R-SOMM2-313D70
$1,078.00
Volume pricing available
Polyurethane
Load rating
2500 lbs
Diameter 3-1/8"
Capacity 2500 lbs
Wheel Polyurethane
More Details Less Details
Width 3"
Height 4.75"
Temp Range -20°F to 180°F
Rig Type Rigid
Brake No Brake
Frame Zinc Plated Steel
Hamilton Low Profile Dual Wheel Rigid Caster - R-SOMM2-313D70 Engineered for Optimal Performance |...
Shop Product
4000 lbs
TieredPricing
Hamilton 4000 lbs Load Capacity Rigid Caster - Son of Mini-Mite Low Profile - 3 1/8" x 3" Steel Roller - Dual Needle Thrust & Roller Bearings - 3/4" Axle Hamilton
Made to Order · 4-6 Wk
Hamilton 3 1/8" x 3" Steel Rigid Caster – 4000 lb
Part # R-SOMM-313FS
$530.00
Volume pricing available
Load rating
4000 lbs
Diameter 3-1/8"
Capacity 4000 lbs
More Details Less Details
Width 3"
Height 4.75"
Temp Range -20°F to 180°F
Rig Type Rigid
Brake No Brake
Frame Zinc Plated Steel
Hamilton 4000 lbs Load Capacity Rigid Caster: Son of Mini-Mite Low Profile Design Premium...
Shop Product

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