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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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Semi-Steel (Gray Iron) Casters · Foundry & Heavy Industrial · 4" to 8" · 700 to 1,250 lb

These semi steel wheel casters carry shop carts and plant trucks on concrete floors. Casters in this collection range from 700 to 1,250 lb per caster. Wheels in this category range from 4 up to 8 in by 2 in wide on 4 x 4-1/2 in plates. A set of 4 is rated 2,800 lb per set. Semi steel rolls with low effort and handles debris and heat. It is loud and can mark finished floors. Match the 4 x 4-1/2 in plate, bolt pattern, and overall height before you order. Choose swivel casters when the cart must turn in place, rigid casters for straight travel, and add a brake when the cart needs to stay put. Capacities below are per caster unless a listing says set. Read the listing for the exact wheel size, overall height, and mount shown. Confirm the load rating printed on the title before you order. Steel wheel aisle: steel wheels. Plate aisle: plate casters.

Shop by type

4 types

Wheel = wheel diameter · capacity is per caster.

700 lbs
TieredPricing
4" x 2" Swivel Caster with Semi-Steel Cast Iron Wheel - 700 Lbs Load Capacity | Heavy-Duty Mobility Solution for Industrial Use - CasterHQ CasterHQ
In Stock · Same/Next Day
4" x 2" Semi-Steel Swivel Caster 4" x 4-1/2" Plate – 700 lb
Part # CB-9SC42-SS
from $45.00
Volume pricing available
Semi-SteelPlate
Load rating
700 lbs
Size4" x 2"
Capacity700 lbs
WheelSemi-Steel
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"
Temp Range -45°F to 600°F
Rig Type Swivel
Brake No Brake
Frame Zinc Plated Steel
4" x 2" Swivel Caster with Semi-Steel Cast Iron Wheel - 700 Lbs Load...
Shop Product
700 lbs
TieredPricing
4" x 2" Inch Rigid Caster - Semi-Steel Cast Iron Wheel - 700 Lbs Capacity CasterHQ
In Stock · Same/Next Day
4" x 2" Semi-Steel Rigid Caster – 700 lb
Part # CB-9RC42-SS
from $38.00
Volume pricing available
Semi-SteelPlate
Load rating
700 lbs
Size4" x 2"
Capacity700 lbs
WheelSemi-Steel
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"
Temp Range -45°F to 600°F
Rig Type Rigid
Brake No Brake
Frame Zinc Plated Steel
4" x 2" Inch Rigid Caster - Semi-Steel Cast Iron Wheel - 700 Lbs...
Shop Product
1000 lbs
TieredPricing
5 Inch x 2 Inch Swivel Caster - 1000 lbs Capacity | Semi-Steel Cast Iron Wheel Heavy Duty CasterHQ
In Stock · Same/Next Day
5" x 2" Semi-Steel Swivel Caster – 1000 lb
Part # CB-9SC52-SS
from $52.00
Volume pricing available
Semi-SteelPlate
Load rating
1000 lbs
Size5" x 2"
Capacity1000 lbs
WheelSemi-Steel
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"
Temp Range -45°F to 600°F
Rig Type Swivel
Brake No Brake
Frame Zinc Plated Steel
5" x 2" Inch Swivel Caster - Semi-Steel Cast Iron Wheel - 1,000 Lbs...
Shop Product
1000 lbs
TieredPricing
5 Inch x 2 Inch Rigid Caster - 1000 lbs Capacity | Semi-Steel Cast Iron Wheel Heavy Duty CasterHQ
In Stock · Same/Next Day
5" x 2" Semi-Steel Rigid Caster 4" x 4-1/2" Top Plate – 1000 lb
Part # CB-9RC52-SS
from $31.00
Volume pricing available
Semi-SteelPlate
Load rating
1000 lbs
Size5" x 2"
Capacity1000 lbs
WheelSemi-Steel
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"
Temp Range -45°F to 600°F
Rig Type Rigid
Brake No Brake
Frame Zinc Plated Steel
5" x 2" Inch Rigid Caster - Semi-Steel Cast Iron Wheel - 1,000 Lbs...
Shop Product
1200 lbs
TieredPricing
6" x 2" Inch Swivel Caster - Semi-Steel Cast Iron Wheel - 1,200 Lbs Capacity CasterHQ
In Stock · Same/Next Day
6" x 2" Semi-Steel Swivel Caster – 1,200 lb
Part # CB-9SC62-SS-1
from $65.00
Volume pricing available
Semi-SteelPlate
Load rating
1200 lbs
Size6" x 2"
Capacity1200 lbs
WheelSemi-Steel
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"
Temp Range -45°F to 600°F
Rig Type Swivel
Brake No Brake
Frame Zinc Plated Steel
6" x 2" Inch Swivel Caster - Semi-Steel Cast Iron Wheel - 1,200 Lbs...
Shop Product
1200 lbs
TieredPricing
6 Inch x 2 Inch Rigid Caster - 1200 lbs Capacity | Semi-Steel Cast Iron Wheel Heavy Duty CasterHQ
In Stock · Same/Next Day
6" x 2" Semi-Steel Rigid Caster – 1200 lb
Part # CB-9RC62-SS
from $40.00
Volume pricing available
Semi-SteelPlate
Load rating
1200 lbs
Size6" x 2"
Capacity1200 lbs
WheelSemi-Steel
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"
Temp Range -45°F to 600°F
Rig Type Rigid
Brake No Brake
Frame Zinc Plated Steel
6" x 2" Inch Rigid Caster - Semi-Steel Cast Iron Wheel - 1,200 Lbs...
Shop Product
1250 lbs
TieredPricing
8 Inch x 2 Inch Swivel Caster - 1250 lbs Capacity | Semi-Steel Cast Iron Wheel | Industrial Grade CasterHQ
In Stock · Same/Next Day
8" x 2" Semi-Steel Swivel Caster – 1250 lb
Part # CB-9SC82-SS
from $80.00
Volume pricing available
Semi-SteelPlate
Load rating
1250 lbs
Size8" x 2"
Capacity1250 lbs
WheelSemi-Steel
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"
Temp Range -45°F to 600°F
Rig Type Swivel
Brake No Brake
Frame Zinc Plated Steel
8" x 2" Swivel Caster | Semi-Steel Cast Iron Wheel | 1,250 lbs CapacityThis...
Shop Product
1250 lbs
TieredPricing
8 Inch x 2 Inch Rigid Caster - 1250 lbs Capacity | Semi-Steel Cast Iron Wheel Heavy Duty CasterHQ
In Stock · Same/Next Day
8" x 2" Semi-Steel Rigid Caster – 1250 lb
Part # CB-9RC82-SS
from $43.00
Volume pricing available
Semi-SteelPlate
Load rating
1250 lbs
Size8" x 2"
Capacity1250 lbs
WheelSemi-Steel
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"
Temp Range -45°F to 600°F
Rig Type Rigid
Brake No Brake
Frame Zinc Plated Steel
8" x 2" Inch Rigid Caster - Semi-Steel Cast Iron Wheel - 1,250 Lbs...
Shop Product
2800 lbs
TieredPricing
4x2 Heavy-Duty Swivel Caster Set with Semi-Steel Cast Iron Wheels - 2800lb Capacity Per Set | Industrial Mobility Solution - CasterHQ CasterHQ
In Stock · Same/Next Day
4" x 2" Semi-Steel Swivel Caster 4" x 4-1/2" Plate · 2,800 lb set of 4
Part # CHQ-4x2-SSCIW-2800-S4
from $121.00
Volume pricing available
Semi-SteelPlate
Load rating
2800 lbs
Size4" x 2"
Capacity2800 lbs
WheelSemi-Steel
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"
Temp Range -45°F to 600°F
Rig Type Swivel
Brake No Brake
Frame Zinc Plated Steel
Product Description for 4x2 Heavy-Duty Swivel Caster Set - CasterHQ 4x2 Swivel Caster Set...
Shop Product

Semi-Steel (Gray Iron) Casters: buying guide

Semi-steel casters in semi-steel, 4 to 8 in wheels, rated 700 to 1,250 lb per caster.

  • Diameter 4 to 8 in
  • Tread 2 in
  • Plate 4 x 4-1/2 in
  • 700 to 1,250 lb per caster

Semi-steel casters by tread

Tread Core Wheel sizes Rated per caster Listed temperature Where it fits
Semi-steel 4, 5, 6 and 8 in 700 to 1,250 lb -45°F to 600°F rough floors, heat and heavy loads

Ratings are for single casters of semi-steel casters, from product fields [S1].

Wheel sizes

Wheel Treads Rated
4 x 2 in semi-steel 700 lb
5 x 2 in semi-steel 1,000 lb
6 x 2 in semi-steel 1,200 lb
8 x 2 in semi-steel 1,250 lb

Choosing semi-steel casters

  1. Load: plan on three casters carrying a four-caster cart [S2]; at 1,250 lb each, a common rating here, that is about 3,750 lb, and the 1,250 lb top rating covers about 3,750 lb.
  2. Mount: most semi-steel casters use a 4 x 4-1/2 in top plate; check the bolt spacing on your frame against the plate size.
  3. Floor: on semi-steel casters, semi-steel suits smooth concrete and heavy loads, but is loud and hard on tile and wood.
  4. Rig: swivel and rigid semi-steel casters are listed.
  5. Heat: among semi-steel casters, the highest listed range is -45°F to 600°F on semi-steel; check the temperature field on each listing before oven or hot-room use.

Related: caster wheels, 4 x 2 in semi-steel casters and 5 x 2 in semi-steel casters.

Semi-steel casters questions

How much weight can semi-steel casters carry?

Single semi-steel casters are rated 700 to 1,250 lb; most fall between 1,000 and 1,250 lb.

What top plate do semi-steel casters use?

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

What wheel material is most common on semi-steel casters?

Semi-steel leads on semi-steel casters, rated 700 to 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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