Heavy Duty Air-Filled Casters · 8"-25" · Up to 7,600 lb · Pneumatic

Custom made to order. All sales final.

Each Hamilton product is custom manufactured for your order (lead time is shown on each product page). Please confirm all specs before checkout, since made-to-order items aren't eligible for returns, exchanges or refunds. Need help? Call 844-439-4335 or email info@casterhq.com and we'll verify fit for you.

These Hamilton air filled casters fit shop carts, equipment, and material handling carts that move heavier loads. Casters in this collection range from 330 to 7,700 lb per caster. Wheels are 8 to 25 in pneumatic, single and dual in swivel and rigid models. Air filled tires cushion the load and roll over gravel, grass, cracks, and debris. Softer polyurethane or soft rubber or TPR tread is the better pick when the floor has chips or grit. 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. Verify the stem or plate matches your old unit before you buy. Pneumatic aisle: pneumatic casters. Plate aisle: plate casters.

Heavy Duty Air-Filled Casters: buying guide

Hamilton heavy-duty pneumatic casters for loads that have to cross gravel, broken asphalt, dock gaps and rail seams. Singles from 330 lb and duals up to 7,700 lb per caster, all with forged steel rigs.

8 to 25 in330 to 7,700 lb per casterSingle and dualMade in USA by Hamilton

Ratings by size

Tire size	Single (S/R-70xx)	Dual (S/R-72xx)
8 in	330 lb	620 lb
10 in	480 lb	910 lb
12 in	625 lb	1,100 lb
16 in	830 lb (4-ply) or 1,220 lb (6-ply 70166)	2,300 lb
18 in	1,800 lb	3,400 lb
21 in	4,050 lb	7,700 lb
25 in	3,800 lb	7,400 lb

CasterHQ product fields [S1]. The 25 in is rated below the 21 in in both styles.

How the rig is built

Hamilton builds the Cush-N-Aire swivels from S.A.E. 1045 drop-forged steel with an integrally forged kingpin and a precision tapered thrust bearing [S2]. The 16 in R-70166-PR, for example, is rated 1,220 lb at 3 mph with a 90 psi maximum and tapered roller bearings [S3]. Rigid models match the swivels in height and bolt pattern, so you can mix them on one frame [S2].

Where they fit

Aircraft ground support, military and construction trailers, and heavy outdoor equipment. Hamilton built the 7200 duals for those jobs [S4].
Shock-sensitive loads such as electronics, ceramics and liquids, which Hamilton lists for the Cush-N-Aire line [S2].
Yards with gravel, rail seams and broken asphalt.

Limits

Tire temperature: -30 to 120°F, with low chemical and abrasion resistance [S3].
Speed: Hamilton rates loads at 3 mph [S3]. Towing faster needs a different wheel.
Flats: Hamilton offers foam-filled and gray non-marking tires as options [S2]. Ask us before ordering.
No brakes on these listings. Plan wheel chocks or a separate floor lock.

Picking a size

Find load per caster using one fewer than the number of casters [S5].
Choose single up to about 4,000 lb and dual above that, or when the ground is soft.
Check overall height and plate: 18 to 25 in models use an 8-1/2 x 8-1/2 in plate.

Duals only: dual-wheel pneumatic casters. Lighter carts: 8 and 10 in air casters.

Heavy-duty air caster questions

What is the biggest pneumatic caster you sell?

The Hamilton 25 in models. The highest rating, though, is the 21 in dual at 7,700 lb per caster.

Do these casters have brakes?

The Hamilton models on this page are listed without brakes.

How fast can I tow on Hamilton pneumatic casters?

Hamilton rates them at 3 mph. For faster towing, ask us about a wheel rated for speed.

Can I mix swivel and rigid models?

Yes. Hamilton rigid models match the swivel heights and bolt patterns.

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] Hamilton Caster, Cush-N-Aire 7000 Series pneumatic casters and catalog page: ply ratings by size, variable flotation, foam-filled and gray non-marking tire options.
[S3] Hamilton Caster, R-70166-PR spec page: 16 in pneumatic, 1,220 lb at 3 mph, 90 psi max, rated -30 to 120°F, cushioning highest, abrasion and chemical resistance low.
[S4] Hamilton Caster, 7200 Series dual pneumatic casters: catalog selection table and S-72210-PR spec page (7,700 lb at 3 mph, 10-ply, 125 psi max, 8-1/2 x 8-1/2 in plate); built for aircraft ground support, construction and outdoor use; foam-filled and gray non-marking options.
[S5] Preferred Equipment casters and wheels quick guide PDF (prefeq.com): load sizing on one less caster, wheel types and floor notes.

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: 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"

(3″ Wide Casters), Industry-Standard

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"

View All • 21 Plate Sizes

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