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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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Ductile Steel Casters · 1,250 lb

This collection holds Ductile Steel Ds casters, built for shop carts, equipment, and material handling carts that move heavier loads. Casters in this collection are rated 1,250 lb per caster. Wheels in this category range from 4 up to 8 inches in diameter with a 2 in tread width. The collection includes swivel and rigid models. Forged steel wheels carry very heavy loads and handle impact, debris, and heat. They are loud and will mark finished floors. Match plate size, bolt pattern, and overall height before you order. Choose swivel casters when the cart must turn in place and rigid casters for straight travel. Read the listing for the exact wheel size, overall height, and mount shown. Confirm the load rating printed on the title before you order. Measure the old wheel or caster before you buy. Check the floor type and the heaviest load the cart will carry before you choose. Forged steel aisle: forged steel casters. Wheel hub: replacement wheels.

Shop by type

4 types

Wheel = wheel diameter · capacity is per caster.

1250 lbs
TieredPricing
Durastar Medium Heavy Duty 30 Series - 4" x 2" Ductile Steel Swivel Caster - 1250 lb Capacity, 4 x 4-1/2 Top Plate | Choose Bearing Options Durastar
Ships in 1-3 Business Days
4" x 2" Ductile Steel Swivel Caster – 1250 lb
Part # 30-S-420-DS-03
from $41.00
Volume pricing available
Ductile IronPlate
Load rating
1250 lbs
Size4" x 2"
Capacity1250 lbs
WheelDuctile Iron
MountPlate 4" x 4-1/2"
TypeSwivel
More Details Less Details
Width 2"
Height 5-5/8"
Bolt Pattern 2-5/8" x 3-5/8" slotted to 3" x 3"
Core Steel
Temp Range -45°F to 800°F
Rig Type Swivel
Brake No Brake
Frame Zinc Plated Steel
Durastar Medium Heavy Duty 30 Series - 4" x 2" Ductile Steel Swivel Caster...
Shop Product
1250 lbs
TieredPricing
Durastar Medium Heavy Duty 30 Series - 8" x 2" Ductile Steel Swivel Caster - 1250 lb Capacity, 4 x 4-1/2 Top Plate | Choose Bearing Options Durastar
Ships in 1-3 Business Days
8" x 2" Ductile Steel Swivel Caster – 1250 lb
Part # 30-S-820-DS-03
from $50.00
Volume pricing available
Ductile IronPlate
Load rating
1250 lbs
Size8" x 2"
Capacity1250 lbs
WheelDuctile Iron
MountPlate 4" x 4-1/2"
TypeSwivel
More Details Less Details
Width 2"
Height 9-1/2"
Bolt Pattern 2-5/8" x 3-5/8" slotted to 3" x 3"
Core Steel
Temp Range -45°F to 800°F
Rig Type Swivel
Brake No Brake
Frame Zinc Plated Steel
Durastar Medium Heavy Duty 30 Series - 8" x 2" Ductile Steel Swivel Caster...
Shop Product
1250 lbs
TieredPricing
Durastar Medium Heavy Duty 30 Series - 6" x 2" Ductile Steel Swivel Caster - 1250 lb Capacity, 4 x 4-1/2 Top Plate Durastar
Ships in 1-3 Business Days
6" x 2" Ductile Steel Swivel Caster – 1250 lb
Part # 30-S-620-DS-03
from $49.00
Volume pricing available
Ductile IronPlate
Load rating
1250 lbs
Size6" x 2"
Capacity1250 lbs
WheelDuctile Iron
MountPlate 4" x 4-1/2"
TypeSwivel
More Details Less Details
Width 2"
Height 7-1/2"
Bolt Pattern 2-5/8" x 3-5/8" slotted to 3" x 3"
Core Steel
Temp Range -45°F to 800°F
Rig Type Swivel
Brake No Brake
Frame Zinc Plated Steel
Durastar Medium Heavy Duty 30 Series - 6" x 2" Ductile Steel Swivel Caster...
Shop Product
1250 lbs
TieredPricing
Durastar Medium Heavy Duty 30 Series - 5" x 2" Ductile Steel Swivel Caster - 1250 lb Capacity, 4 x 4-1/2 Top Plate | Choose Bearing Options Durastar
Ships in 1-3 Business Days
5" x 2" Ductile Steel Swivel Caster – 1250 lb
Part # 30-S-520-DS-03
from $46.00
Volume pricing available
Ductile IronPlate
Load rating
1250 lbs
Size5" x 2"
Capacity1250 lbs
WheelDuctile Iron
MountPlate 4" x 4-1/2"
TypeSwivel
More Details Less Details
Width 2"
Height 6-1/2"
Bolt Pattern 2-5/8" x 3-5/8" slotted to 3" x 3"
Core Steel
Temp Range -45°F to 800°F
Rig Type Swivel
Brake No Brake
Frame Zinc Plated Steel
Durastar Medium Heavy Duty 30 Series - 5" x 2" Ductile Steel Swivel Caster...
Shop Product
1250 lbs
TieredPricing
Durastar Medium Heavy Duty 30 Series - 8" x 2" Ductile Steel Rigid Caster - 1250 lb Capacity, 4 x 4-1/2 Top Plate | Choose Bearing Options Durastar
Ships in 1-3 Business Days
8" x 2" Ductile Steel Rigid Caster – 1250 lb
Part # 30-R-820-DS-03
from $49.00
Volume pricing available
Ductile IronPlate
Load rating
1250 lbs
Size8" x 2"
Capacity1250 lbs
WheelDuctile Iron
MountPlate 4" x 4-1/2"
TypeRigid
More Details Less Details
Width 2"
Height 9-1/2"
Bolt Pattern 2-5/8" x 3-5/8" slotted to 3" x 3"
Core Steel
Temp Range -45°F to 800°F
Rig Type Rigid
Brake No Brake
Frame Zinc Plated Steel
Durastar Medium Heavy Duty 30 Series - 8" x 2" Ductile Steel Rigid Caster...
Shop Product
1250 lbs
TieredPricing
Durastar Medium Heavy Duty 30 Series - 6" x 2" Ductile Steel Rigid Caster - 1250 lb Capacity, 4 x 4-1/2 Top Plate Durastar
Ships in 1-3 Business Days
6" x 2" Ductile Steel Rigid Caster – 1250 lb
Part # 30-R-620-DS-03
from $48.00
Volume pricing available
Ductile IronPlate
Load rating
1250 lbs
Size6" x 2"
Capacity1250 lbs
WheelDuctile Iron
MountPlate 4" x 4-1/2"
TypeRigid
More Details Less Details
Width 2"
Height 7-1/2"
Bolt Pattern 2-5/8" x 3-5/8" slotted to 3" x 3"
Core Steel
Temp Range -45°F to 800°F
Rig Type Rigid
Brake No Brake
Frame Zinc Plated Steel
Durastar Medium Heavy Duty 30 Series - 6" x 2" Ductile Steel Rigid Caster...
Shop Product
1250 lbs
TieredPricing
Durastar Medium Heavy Duty 30 Series - 5" x 2" Ductile Steel Rigid Caster - 1250 lb Capacity, 4 x 4-1/2 Top Plate | Choose Bearing Options Durastar
Ships in 1-3 Business Days
5" x 2" Ductile Steel Rigid Caster – 1250 lb
Part # 30-R-520-DS-03
from $45.00
Volume pricing available
Ductile IronPlate
Load rating
1250 lbs
Size5" x 2"
Capacity1250 lbs
WheelDuctile Iron
MountPlate 4" x 4-1/2"
TypeRigid
More Details Less Details
Width 2"
Height 6-1/2"
Bolt Pattern 2-5/8" x 3-5/8" slotted to 3" x 3"
Core Steel
Temp Range -45°F to 800°F
Rig Type Rigid
Brake No Brake
Frame Zinc Plated Steel
Durastar Medium Heavy Duty 30 Series - 5" x 2" Ductile Steel Rigid Caster...
Shop Product
1250 lbs
TieredPricing
Durastar Medium Heavy Duty 30 Series - 4" x 2" Ductile Steel Rigid Caster - 1250 lb Capacity, 4 x 4-1/2 Top Plate | Choose Bearing Options Durastar
Ships in 1-3 Business Days
4" x 2" Ductile Steel Rigid Caster – 1250 lb
Part # 30-R-420-DS-03
from $40.00
Volume pricing available
Ductile IronPlate
Load rating
1250 lbs
Size4" x 2"
Capacity1250 lbs
WheelDuctile Iron
MountPlate 4" x 4-1/2"
TypeRigid
More Details Less Details
Width 2"
Height 5-5/8"
Bolt Pattern 2-5/8" x 3-5/8" slotted to 3" x 3"
Core Steel
Temp Range -45°F to 180°F
Rig Type Rigid
Brake No Brake
Frame Zinc Plated Steel
Durastar Medium Heavy Duty 30 Series - 4" x 2" Ductile Steel Rigid Caster...
Shop Product

Durastar ductile steel casters by tread

Tread Core Wheel sizes Rated per caster Listed temperature Where it fits
Ductile iron Steel 4, 5, 6 and 8 in 1,250 lb -45°F to 800°F heavy loads with better impact strength than cast iron

Ratings are for single casters of Durastar ductile steel casters, from product fields [S1].

Wheel sizes

Wheel Treads Rated
4 x 2 in ductile iron 1,250 lb
5 x 2 in ductile iron 1,250 lb
6 x 2 in ductile iron 1,250 lb
8 x 2 in ductile iron 1,250 lb

Choosing Durastar ductile steel casters

  1. Load: divide the loaded weight by three for a four-caster cart [S2]; at 1,250 lb each, Durastar ductile steel casters suit a loaded cart of about 3,750 lb.
  2. Mount: most Durastar ductile steel casters use a 4 x 4-1/2 in top plate; measure bolt hole centers on the old plate and compare.
  3. Floor: on Durastar ductile steel casters, ductile iron suits smooth concrete and heavy loads, but is loud and hard on tile and wood.
  4. Rig: swivel and rigid Durastar ductile steel casters are listed.
  5. Heat: among Durastar ductile steel casters, the highest listed range is -45°F to 800°F on ductile iron; check the temperature field on each listing before oven or hot-room use.

Related to Durastar ductile steel casters: 5 x 2 in ductile steel casters.

Durastar ductile steel casters questions

How much weight can Durastar ductile steel casters carry?

Single Durastar ductile steel casters are rated 1,250 lb.

What top plate do Durastar ductile steel casters use?

Most Durastar ductile steel casters use 4 x 4-1/2 in.

What wheel material is most common on Durastar ductile steel casters?

Ductile iron leads on Durastar ductile steel casters, rated 1,250 lb per caster.

Jordan Wilson, CasterHQ · reviewed October 20, 2026 · 844-439-4335 · info@casterhq.com

Sources

  • [S1] CasterHQ product fields (rated load, diameter, width, wheel and core material, temperature range, mount) and product descriptions for the items on this page, pulled October 20, 2026.
  • [S2] Preferred Equipment casters and wheels quick guide PDF (prefeq.com): load sizing on one less caster, wheel types and floor notes.

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